Heater Troubleshooting Guides

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1 Heater Troubleshooting Guides Table Of Contents LRZE, 3 LRZM.. 4, 5 LXi.. 6, 7 LITE LD.. 8, 9 LITE LJ.. 10, 11 LITE LG. 1, 13 LX or LT STANDARD BURNERS 14, 15 LX or LT LOW x BURNERS. 16, 17 HiE 18, 19 SERIES 1 & SPARK IGNITION. 0 SERIES 1 & MILLIVOLT. 1 HOT SHOT (100 K)...., 3 DP OIL FIRED. 4 1

2 LRZE TROUBLESHOOTING Universal Control J1 15 Valve Monitor Circuit J 9 HO Water Temperature Sensor Brown Fuse 50 V amp Transformer / 1 / Ignition Control Fusible Link 305 F High Limits 130 ºF Blue ºF (red dot) Blue Orange Vent Temp Limit 464 F Marking Gray J17 8 J16 J15 4 J 6 3 Power Interface Board (PIB) J 3 F FC 4 VAC Diagnostic LED GND VAL W IGN/ FS L L1 IGN/ 10 IGN/ 40 Brown 11 / A B 10 or 40 VAC Power Supply Purple 4 VAC COMP/ IGN 10 PUMP FAN/ LOUVER Pressure / C Brown 13 Gas Valve Hot Surface Igniter 14 Flame Sensor 1 D Burner STEP 1 Check in coming power (make certain filter pump motor is ON). 40 or 10 VAC between (A) wire and (B) wire? Make certain filter pump is on. Correct wiring. STEP Check Transformer 4 VAC between () wire STEP 3 Check Fuse 4 VAC between (3) wire on PIB STEP 4 Check power to Water Press. Sw. 4 VAC between Purple (4) wire on PIB STEP 5 Check thru Water Press. Sw. 4 VAC between Gray (5) wire on PIB STEP 6 Check thru Vent Temp Limit 4 VAC between Orange (6) wire after Vent Temp Limit and (1) wire on Transformer? STEP 7 Check thru Fusible Link 4 VAC between Blue (7) wire on PIB Replace Transformer Locate and correct short circuit, replace Fuse. Make certain Universal Control is calling for heat (red LED on). Recheck voltage at (3) wire. If voltage is 4 VAC replace PIB. Do a Back Pressure Test. If pressure is higher than PSI, replace Water Pressure. If less, clean filter, baskets or repair pressure problem. Correct blockage in vent. Replace Vent Temp Limit Check wires to Fusible Link, replace Fusible Link. Correct excessive heat problem in cabinet. Possible rollout. STEP 8 Check power to High Limits 4 VAC between (8) wire on PIB STEP 9 Check thru High Limits 4 VAC between (9) wire on PIB Make certain control is calling for heat. 4 VAC between / (10) wire on PIB at J3 and (1) wire on Transformer? STEP 10 Check power to Ignition Control STEP 11 Check power at Ignition Control 4 VAC between / (11) at W terminal of Ignition Control and (1) wire of Transformer? Is Igniter (1) glowing? STEP 13 Go to back page STEP 1 Check Hot Surface Igniter (Igniter) Recheck power at Blue (7) wire. If 4 VAC at Blue but not, replace PIB. Replace both High Limits. Do a Temp. Rise Test. Correct flow problem. Recheck power at (9) wire. If 4 VAC at, but not / (10), replace PIB. Correct problem with / wire or its connectors. Turn heater OFF. Disconnect Igniter at C & D. Turn heater ON. Check voltage in the connector ends of C & D going to the Ignition Control (not to the Igniter). If your meter is a true RMS meter the voltage should read 105 to 130 VAC. If your meter is not a true RMS meter the voltage should read 64 to 130 VAC. If the voltage is within range replace the Igniter. If the voltage is low recheck incoming power. If the voltage is above 130 VAC replace both the Igniter and Ignition Control.

3 STEP 13 Check for Ignition After the Igniter begins to glow, wait approximately 40 seconds. Did the burners ignite? LRZE TROUBLESHOOTING Check voltage between Brown (13) wire at Gas Valve and (1) wire of transformer. Is there 4 VAC? Check supply gas pressure (see chart below). Did burners ignite? Check voltage at VAL of Ignition Control. If 4 VAC, replace brown wire. If no voltage replace Ignition Control. Check manifold pressure (see chart below). If supply was correct but there is no pressure on manifold replace the Gas Valve. If pressure is high check for plugged or wrong orifices. If pressure exists but is low correct supply problem. STEP 14 Check Burners operation Do Burners stay on past 7 seconds? STEP 15 Check Burners operation Do Burners stay on past 5 minutes? Does flame look blue or yellow? 4 VAC between Brown (15) and (1) wires? Replace PIB. Go back to Step 13. Heater is not recognizing the flame (flame rectification). Any of the following can prevent flame rectification: Low gas pressure. Plugged burner orifice. Poorly connected or missing ground wire. Corroded or dirty Flame Sense Rod. Ignition Control not receiving flame sense signal. Or there is insufficient current when the gas valve is powered. Current loss can be caused by any of the following: Excessive corrosion on wire terminals. Frayed or over heated wires. Pitting of contact points of the Water Pressure or corrosion on connectors of the High Limits. To determine whether the problem is lack of rectification or loss of current, check voltage at the / (11) wire at the Ignition Control. Keep the meter probe at this location and watch the reading. If, after the gas valve receives power, the voltage slowly drops until the gas valve shuts off, then returns to normal, the problem is due to loss of current. Recheck gas pressure, burner orifices and air supply (see manual for more details). Blue Heater is operating. Fault Codes DISPLAY FAULT Display shows FLOW FAULT- HIGH LIMIT FAULT- FUSELINK/FIELD FAULT- CHECK IGN CONTROL CAUSE 1. Pump is not running.. Low pump pressure. 3. Pressure switch fault. 1. Water temperature in heater exceeds the internal limit.. Limit switch fault. 1. Fusible link fault. 1. Air flow restricted at intake or discharge.. Oscillating pump pressure. 3. Low gas supply pressure. 4. flame at burners. 5. Check Ignition Control LED. REMEDY 1. This is normal display when the pump is OFF. service required.. Clean filter or clear blockage, check position of valves in plumbing system. 3. Adjust or replace pressure switch. 1. Verify function of high limit switches. Perform Temperature Rise Test (see chart below). Identify and correct cause of overheating.. Identify and correct loose connections or replace switches. 1. Identify and correct loose connections or replace Fusible Link. 1. Check for proper clearances around heater and for adequate room ventilation if enclosed. Inspect for blockage or restriction at discharge of flue.. Clean filter or identify and repair cause of pump oscillation. 3. Identify and repair incorrect supply pipe size or pipe line blockage. 4. Identify and correct loose wiring connections, or problem with Igniter. Flame Sensor, Gas Valve or Ignition Control. 5. If the LED is on continuously, replace the ignition control. If the LED is blinking, check for causes of the unrecognized flame. FAULT- SHORTED H0 SENSOR OR FAULT- OPEN WATER SENSOR 1. Faulty wiring or connection.. Faulty sensor. 1. Inspect Sensor wiring. Ensure Sensor is connected into Power Interface Board (PIB).. Inspect Sensor wires. Replace Temperature Sensor. Temperature Rise Chart Gas Pressure Chart

4 LRZM TROUBLESHOOTING Rocker Jandy MIN MAX Temperature Control Thermostat Fireman s Connection 6 AquaLink RS 5 Hi-Limit 150º F (red dot) 4 Vent Temp Limit 464 F Marking Fusible Link 305 F Hi-Limit 130º F 7 8 Pressure BLACK Generator POT POT Valve (TH) ORANGE Temperature Board 1 + (PP) SEN SEN TH/PP Pilot 9 To dissipate excess current, the LED will flash approximately every 7 seconds when the heater is enabled but the thermostat setting has been satisfied. If the LED does not flash, try reversing the Generator leads at the Gas Valve. Wires to control or fireman s switch. Minimum wire size: 14 AWG, 105º C Maximum length: 10 to 15 feet. TH Gas Valve 10 Coil wires 3 RED Thermistor PP-TH PP Set gas valve knob to the Pilot position. Set thermostat rocker switch to OFF. Set meter to VDC above one. STEP 1 Try to light pilot Does pilot light? STEP Check pilot operation Does pilot stay on when gas valve knob is released? STEP 3 Check pilot output Is there 500+ mv between PP and PP-TH terminals? 1. Verify gas is on.. Check for air in gas line. 3. Check for clogged pilot tube or orifice. 1. Check P/G output.. Check for shorted wires. 3. Check pilot coil (yellow wires). 1. Check for low Pilot Generator output.. Check for partial shorts or loose wires. 3. Replace Pilot Generator. For the following tests leave the probe on the PP terminal. Move the probe to each test position. STEP 4 Check Fusible Link Is there 500+ mv through Fusible Link? STEP 6 Check Fireman s Is there 500+ mv through Fireman s? STEP 7 Check High Limits Is there 500+ mv through at wire of Pressure? STEP 5 Check Vent Temp Limit Is there 500+ mv through Vent Temp Limit? Replace Fusible Link. Check for Roll out, Soot, Down drafting, Low Gas Pressure, etc. Check for blockage in the vent. Replace Vent Temp Limit. Check that a control system (if installed) is calling for heat or Fireman s loop is closed. Check wire harness to High Limits for damage, if OK replace both High Limit. Check for damage to by pass disc, headers, or exchanger. Do a Temperature Rise Test. STEP 8 Check Pressure Is there 500+ Wire of Pressure? Make certain filter pump is ON. Perform Back Pressure Test. If.5 PSI or more, replace switch. If less, check pump, filter, etc. for pressure problem. Set rocker switch to ON. Set thermostat to maximum. STEP 9 Check Thermostat Is there 00+ wire of Temp. Board on terminal TH/PP? STEP 10 Check Gas Valve Is there 00+ TH terminal of the Gas Valve? Move rocker switch to OFF. Rotate Gas Valve Knob to ON. Move rocker switch to ON. Does heater fire? Zero volts - Replace rocker switch mv do the tests below. Check #1 burner and orifice. Check gas pressure. If all OK replace Gas Valve. Perform Thermistor Test (see back pg.) Disconnect pot wires (orange) and jump pot terminals. If voltage drops to 00+ mv, replace Temp. Control. Replace Temp. Board After correcting problem return to Step 9 and proceed.

5 LRZM TROUBLESHOOTING Total Millivolt (mv) Loss Test After the heater is completely operational and firing, do a Total Millivolt Loss Test by place one meter probe on PP-TH and the other probe on TH of the Gas Valve. The meter will now read the total millivolts lost in the entire circuit. Maximum allowable loss for the LRZM is 80 mv. If the loss is greater than 80 mv, test each wire and component by placing one probe at one end and the other probe at the other end of each item. Ideally all wires should have a zero reading and each component, except the Rocker and Temperature Board should have no more than a 5 mv loss. The Rocker can have up to 10 mv and the Temperature Board up to 50 mv. Any item which shows higher than allowable loss should be cleaned, repaired or replaced. Supply Pressure Natural Gas LP Gas Manifold Pressure Natural Gas LP Gas Gas Pressure Chart Minimum 5.5 Inches WC (1.4 kpa) 10.0 Inches WC (.5 kpa) minal 4.0 Inches WC (1.0 kpa) 9.0 Inches WC (. kpa) Maximum 10.0 Inches WC (.5 kpa) 14.0 Inches WC (3.5 kpa) Temperature Rise Chart Thermistor (Water Temperature Sensor) Chart WATER TEMP IN HEADER ºF (ºC) 50 (10) 60 (15) 70 (1) 80 (6) 90 (3) 100 (38) APPROX. RESISTANCE IN 1,000 S OF OHMS (kohms) Symptom Cause Remedy Pump not operating. Pilot outage. Flame roll-out at startup. Spillage at draft hood. Lazy flame with yellow tip. t enough heat Heater pounding or knocking. Heater condensing Pressure relief valve opens. Pilot is lit but main burners will not come on. Heater short cycles A. power B. Pump defective C. Incorrect wiring A. Inlet gas pressure low B. Inlet gas pressure too high causing an unstable blowing pilot. C. Weak or defective thermocouple. D. Damaged pilot or thermocouple E. Dirty pilot F. Plugged or undersized pilot orifice. A. Check burner orifices for blockage (spider webs) B. Blocked flue C. Pilot out of position (delayed ignition) D. Blocked heat exchanger. E. Fiber board out of place. F. Altered vent cap. G. Low gas pressure A. Cold chimney B. Vent pipe pitches down to chimney C. Blocked chimney. D. Altered draft hood. E. Prefabricated chimney with incorrect cap. A. Low primary air. A. Inadequate gas supply B. Low manifold gas pressure. C. Heater size inadequate. D. Low Temperature Rise. A. Inadequate water flow through heater. A. Low water temperature. A. Restriction in water flow system at or downstream of heater A. Gas valve not at ON position. B. Hi-Limit switches failed. C. Pressure switch failed or out of adjustment. D. Fusible Link failed. E. Gas valve failed. F. Broken wire in thermostat circuit or defective thermostat. G. Heater wired incorrectly. A. Low water flow through heater. B. Failed High-limit switch. A. Check circuit breaker and power. B. Replace. C. Recheck wiring. A. Consult gas utility company. Inlet gas pressure to heater should be 5.5 to 10.0 WC for Natural Gas or 10.0 to 14 for Propane Gas. B. Pressure should be regulated within limits shown above. C. Replace thermocouple. D. Replace. E. Blow dust or lint out of pilot. F. Clean or replace pilot orifice. A. Remove and clean each orifice. B. Remove blockage. C. Correct pilot position. D. Clean or correct as necessary. E. Clean or correct fiber board as necessary. F. Install factory provided vent cap. G. Check and correct gas pressure. A. Allow heater to operate five (5) minutes to create draft action. B. Reinstall vent cap to pitch up from heater to chimney. C. Remove blockage. D. Install factory provided draft hood. E. Install UL listed vent cap. A. Check for blocked louvers or openings to heater. A. Gas meter too small. Gas line from meter to heater too small. B. Gas pressure on heater manifold should be adjusted to 4.0 WC Natural Gas, 9.0 WC Propane. C. Replace with heater of higher input rating. D. Check and correct water flow. A. Check Temperature Rise (see chart above). If temperature rise is above the maximum check for damaged or incorrectly set bypass. A. Flue product moisture will condense at the start-up until the water temperature reaches normal operating conditions. A. Check for proper operation of all valves, bypass valve and any equipment between pool and heater outlet. A. Turn knob to ON position. B. Investigate reason for overheating and replace Hi-limit switches. C. Adjust pressure switch or replace as necessary. D. Investigate reason for flame rollout and replace Fusible link as necessary. E. Check and replace Gas Valve as necessary. F. Check continuity through thermostat circuit with wires disconnected. G. Check heater wiring against wiring diagram. A. Increase size of pump or increase piping size as necessary. B. Check Hi-limit switches and replace as necessary. 5

6 LXi Troubleshooting Guide Serial Number G11LB0001 or newer te: If Blower is ON, go to Step 13 on back page. STEP 1 Check Power at Dist. Brd. (make certain filter pump motor is ON). 40 or 10 VAC between (C) wire and (B) wire on Power Dist. Brd.? Make certain filter pump is on. Correct wiring. STEP Check Transformer 4 VAC between () wire STEP 3 Check Fuse 4 VAC between (3) wire on PIB STEP 4 Check power to Water Press. Sw. 4 VAC between Purple (4) wire on PIB STEP 5 Check Water Pressure 4 VAC between Gray (5) wire on PIB STEP 6 Check power to Fusible Link 4 VAC between Orange (6) wire on PIB STEP 7 Check Fusible Link 4 VAC between Blue (7) wire on PIB If wired 40 VAC check voltage between (E) wire and Blue (F) wire. If wired 10 VAC check voltage between (E) and (D) wires. If the correct voltage is present, replace Transformer, if not check Conversion Board position. Locate and correct short circuit, replace Fuse. Recheck voltage at (3) wire, if voltage is 4 VAC replace PIB. Do a Back Pressure Test, if pressure is higher than PSI, replace Water Pressure, if less clean filter, baskets or repair pressure problem. Recheck voltage at Gray (5) wire, if voltage is 4 VAC replace PIB. Check Fusible Link Air Box and, Vent Temp Limit individually. Replace failed part. Correct excessive heat problem in vent or air box. STEP 8 Check power to High Limits 4 VAC between (8) wire on PIB STEP 9 Check High Limits 4 VAC between (9) wire on PIB 4 VAC between / (10) wire on PIB and (1) wire on Transformer? STEP 10 Check power to Ignition Control STEP 11 Check power at Ignition Control 4 VAC between / (11) at W terminal of Ignition Control and of Transformer? STEP 1 Check Blower Is Blower ON? Correct incoming power problem. STEP 13 Go to back page Recheck power at Blue (7) wire. If 4 VAC at Blue but not, replace PIB. Replace both High Limits. Do a Temp. Rise Test. Recheck power at (9) wire. If 4 VAC at, but not / (10), replace PIB. Correct problem with / wire or its connectors. Check voltage between F terminal of Ignition Control and ground (A). Is voltage 105 VAC or higher? Check voltage between F1 terminal of Ignition Control and ground (A). Is voltage 105 VAC or higher? If no, replace Ignition Control, if yes check voltage between (L) wire to Blower on PDB and ground (A). If voltage is 105 VAC or higher replace Blower, if lower check wires, replace PDB

7 LXi Troubleshooting Guide Serial Number G11LB0001 or newer Blower is ON See te below. STEP 13 Check Air Pressure 4 VAC between Orange () wire at the Air Pressure STEP 14 Check Power to PSW 4 VAC between Orange (1) wire at the Ignition Control and (1) wire on Transformer? STEP 15 Check Hot Surface Igniter After Blower comes on wait at least 15 seconds (Pre-Purge). Is Igniter glowing? STEP 16 Check for Ignition After the HSI begins to glow, wait approximately 40 seconds. Did the burners ignite? Make certain Blower is on and combustion chamber is sealed. Check air tubes for kinks or holes. Make certain front air tube is connected to the positive (+) side and back/lower air tube is connected to negative (-) side of the Air Pressure. If all are OK replace the Air Pressure. Check wire connections. Replace Orange wire. Check voltage between K and J of the Ignition Control. If 105 to 130 VAC, check wires and connectors to the Igniter, if OK, replace Igniter. If voltage is less than 105 VAC check incoming voltage between L1 and L, if voltage is 105 to 130 VAC replace Ignition Control. Check voltage on Brown (13) wire at terminal VAL of the Ignition Control. Is there 4 VAC at VAL? Replace Ignition Control. Check supply gas pressure. If OK, replace Gas Valve. STEP 17 Check Burners operation Do Burners stay on beyond 7 seconds? Heater is operating. Heater is not recognizing the flame (flame rectification). Any of the following can prevent flame rectification: Low gas pressure. Poorly connected or missing ground wire. Corroded or dirty Flame Sense Rod. Ignition Control not sending flame sense signal. Or there is insufficient current when the gas valve is powered. Current loss can be caused by any of the following: Excessive corrosion on wire terminals. Frayed or over heated wires. Pitting of contact points, usually at the Water Pressure or High Limits. To determine whether the problem is lack of rectification or loss of current, check voltage at the / (11) wire at the Ignition Control. Keep the meter probe at this location and watch the reading. If, after the gas valve receives power, the voltage slowly drops until the gas valve shuts off, then returns to normal, the problem is due to loss of current. te: If the blower runs continuously, unplug F1/F connector from the Ignition Control, if the blower goes off replace the Ignition Control. If the blower stays on, check for shorted wires between the Ignition Control and PDB or from the PDB and the Blower. Service Codes TEMPERATURE RISE MODEL 50 Serial # A & B Serial # C & Newer MODEL 300 Serial # A & B Serial # C & Newer MODEL 400 Serial # A & B Serial # C & Newer MIN. MAX. 7 F 10 F 8 F 1 F MIN. MAX. 8 F 11 F 11 F 18 F MIN. MAX. 13 F 17 F 14 F 1 F GAS PRESSURE Inches of Water Column Manifold Natural LP Supply 5.5 to to 14

8 LITE LD-DIRECT IGNITION TROUBLESHOOTING w/digital Ignition Control Pressure Temperature Control Thermistor 4 5 4b Hi-Limit 135 F AquaLink RS 4a Hi-Limit 150 F (red dot) Hot Surface Ignitor 3a Fireman s Connection 3 Fusible Link /Green /Green MV MV 8 Brown / Transformer Fuse 7 1 IGN 40 IGN 10 L1 L IGN/FS TH IND 6 VAL GND / / F1 F 4 VAC FC 40 VAC Gas Valve FENWAL DIGITAL IGNITION CONTROL Flame Proving Rod Tan Tan STEP 1 4 VAC at Transformer STEP 4 VAC at Wire of Fuse Link? STEP 3 4 VAC at Wire of Fuse Link? STEP 3a 4 VAC at both Fireman terminal s STEP 4 4 VAC at Wire of Pressure? STEP 5 4 VAC at Wire of Pressure? 1) Check incoming Power Supply. ) Check Transformer Wiring. 3) Replace Transformer. Fuse is blown. Look for short or overload of controls. Do not jumper or bypass. Fuse protects transformer. Too much heat in control area. Look for down drafting, Roll-out, Soot, or Low Gas Pressure. Replace Fuse Link. Check that a control system (if installed) is calling for heat or the Fireman s is closed. 1) Check each limit individually. 4a & 4b ) Check if damage to disc, heads, or exchanger. 3) Take Temperature Rise. Perform back pressure test. If PSI or more, replace switch. If less, check pump, filter, etc., for water flow problems. STEP 6 4 VAC at / wire at the IND of Ignition Control? 4 VAC at the wire at TH of the Ignition Control Wait for 15 second delay. STEP 7 Does Ignitor heat up? STEP 8 4 VAC at VAL of the Ignition Control? STEP 9 Does heater fire? Is temperature Board calling for heat? Do a Thermistor Test. Is thermistor within range? See chart on back page. Replace Thermistor Replace Temp. Board. Remove the connector at F1 & F of the Ignition Control. Perform a continuity test between F1 & F terminals on the Ignition Control. Is there continuity? Check wire connectors. Replace Ignition Control. 1. Is Ignition Control wired for proper voltage?. Is Ignitor properly connected? 3. Do Ignitor Test. Is Ignitor within range? Replace Ignition Control. Remember, the VAL terminal will only have power for 7 seconds after the Ignitor has heated for 35 seconds. If there is never 4 VAC at the VAL, even after the Ignitor has heated and shut down, replace the Ignition Control. Verify Ignitor wiring. Are all gas valves open? Is gas pressure correct? OK Replace Ignitor. Replace Gas Valve. 8

9 OFF μ 000μ 00m 0m 00m 000K 10A 00K hfe 0K K 00 NPN PNP OFF μ 000μ 00m 0m 00m 000K 10A 00K hfe 0K K 00 NPN PNP Safety Circuit Test Leave black probe on Transformer terminal with yellow wire. Move red probe to each component Fusible Link Transformer 40 VAC Hot Surface Ignitor Test Ignitor must be disconnected from the Ignition Control and cool to the touch. Resistance through the Hot Surface Ignitor should be 40 to 75 Ohms. Set meter to test resistance. ACV above 30 V DCV ACV DCA DCV ACV DCA Wire Test Hot Surface Ignitor at Ambient Temperature - range 40 to 75 Ohms- Thermistor Test Remove thermistor leads from temperature board. Set meter to test resistance above 0 K Ohms. Using chart at the right, compare the actual water temperature to the resistance reading to determine if the thermistor is OK. MODEL Lite, Lite, Series 1 & Series with header connections DCV 00m 000K 00K 0K Series 1 with 1½ header connections NPN 0 PNP K OFF 00 ACV DCA 00μ 0m 00m 10A hfe Temperature Rise Test Chart Btus 000μ Resistance at 0 K or above Temperature Rise MINIMUM MAXIMUM Thermistor Test Chart Temp Resistance Temp Resistance 50 F K Ohms 78 F K Ohms 51 F K Ohms 79 F K Ohms 5 F K Ohms 80 F 9.84 K Ohms 53 F K Ohms 81 F K Ohms 54 F K Ohms 8 F K Ohms 55 F K Ohms 83 F K Ohms 56 F K Ohms 84 F K Ohms 57 F K Ohms 85 F 8.53 K Ohms 58 F K Ohms 86 F K Ohms 59 F K Ohms 87 F K Ohms 60 F K Ohms 88 F K Ohms 61 F K Ohms 89 F K Ohms 6 F K Ohms 90 F K Ohms 63 F K Ohms 91 F K Ohms 64 F K Ohms 9 F K Ohms 65 F K Ohms 93 F K Ohms 66 F K Ohms 94 F K Ohms 67 F K Ohms 95 F K Ohms 68 F 1.49 K Ohms 96 F K Ohms 69 F K Ohms 97 F 6.38 K Ohms 70 F K Ohms 98 F K Ohms 71 F K Ohms 99 F K Ohms 7 F K Ohms 100 F 5.89 K Ohms 73 F K Ohms 101 F K Ohms 74 F K Ohms 10 F 5.57 K Ohms 75 F K Ohms 103 F K Ohms 76 F K Ohms 104 F 5.37 K Ohms 77 F K Ohms 9

10 LITE LJ TROUBLESHOOTING HOT SURFACE IGNITOR RMAL MODE BLACK GREEN POOL 84 F --- POOL-OFF-SPA UP DOWN PUMP FLAME SENSOR MV MV 8 GREEN GAS VALVE BROWN THERMISTOR 135º F HIGH LIMIT 150º F HIGH LIMIT (RED DOT) S S 5c 5b 7a 7b RED PRESSURE SWITCH 5a 6 4b FUSIBLE LINK RED 4a 7c FUSE FUSE 7d AMP, 1¼ LONG FUSE YELLOW BLACK RED RED FIREMAN S SWITCH RED 3b 3a FLAME GAS SAFETY FIREMAN SWITCH PUMP BLOWER HOT SURFACE IGNITOR POWER CONTROL BOARD INLET TEMP SENSOR POWER ON A B 1 AMP RMAL EXT POWER AMP, 3/4 long 3 1 TRANSFORMER VOLTAGES BETWEEN BLUE(1) & BLUE() 4 VAC BETWEEN BLUE(!) & (3) 1 VAC 115 or 30 VAC For Thermostat troubleshooting refer to the installation manual. STEP 1 - Check Transformer - Set meter to ACV above 40 4 VAC between 1) Check incoming power. (A & B) STEP 5 - Check High Limits Blue 1 & Blue wires? ) Turn off incoming power. Check 4 VAC at white wire positioning of Conversion Block. 3) Replace Transformer. of Pressure? (5a) 1 VAC between 1) Check incoming power. (A & B) ) Turn off incoming power. Check Blue & 3 wires? STEP 6 - Check Pressure positioning of Conversion Block. 4 VAC at black wire 3) Replace Transformer. of Pressure? (6) STEP - Check Fuse (insert common probe in with blue 1 wire, touch other probe to far end of fuse) 4 VAC at far end of fuse? 1) Check for short circuits. ) Replace fuse. For the next tests insert and leave the common probe in with the blue() wire. STEP 3 - Check Fireman s Circuit 4 VAC at 3a? Power Control is not sending power. Replace Power Control Board. 4 VAC at 3b? 4 VAC on white wire at Fusible Link? (4b) Fireman s switch circuit is open. Make sure the external control is calling for heat. STEP 4 - Check Fusible Link 4 VAC on red wire Check wires for lose connections. at Fusible Link? (4a) Replace Ignition board. Too much heat in control area. Look for down drafting, Roll-out, Soot, or Low Gas Pressure. Replace Fusible Link. STEP 8 - Check Gas Valve After 10 seconds of Ignitor heat up, is there 4 VAC at brown wire to gas valve? Does heater fire? One or both of the limits are open.(5b & 5c) 1)Check for damage to bypass disc, heads, or exchanger. )Jandy recommends replacing both limits. 3)Do Temperature Rise Test. Perform Back Pressure Test. If.5 PSI or more, replace Pressure. If less, check pump, filter, etc., for water flow problems. For Ignitor Test, remove common probe from blue() wire. STEP 7 - Check Hot Surface Ignitor Does Ignitor heat up? Turn power off, disconnect Ignitor at 7a and 7b. Perform Ignitor Test. Is resistance between 5 and 300 Ohms? Remove each fuse (7c & 7d). Check each for continuity. If either is blown, check for shorted wires, then replace fuse. If neither fuse is blown replace the ignition control. Replace Power Control Board. Make certain all gas valves are open, the correct fuel is provided to the heater, gas pressure and volume are correct. OK Replace Ignitor. For Gas Valve test reinsert the common probe in with the blue() wire. Replace Gas Valve. 10

11 Temperature Rise Test Chart MODEL Lite, Lite, Series 1 & Series with header connections Series 1 with 1½ header connections Btus Temperature Rise MINIMUM MAXIMUM Hot Surface Ignitor Test Ignitor must be disconnected from the Ignition Control and should be cool to the touch. Depending on the temperature of the ignitor, the resistance between the two leads of a good ignitor will be 5 to 300 Ohms, typically 60 to 80 Ohms. OFF ACV DCV DCA 0 00μ 000μ 00m 0m 00m 000K 10A 00K hfe 0K K 00 NPN PNP Set meter to test resistance. Thermistor Test Thermistor Test Chart Remove thermistor leads from ignition board. Set meter to test resistance above 0 K Ohms. Using chart at the right, compare the actual water temperature to the resistance reading to determine if the thermistor is OK. NPN DCV 00m K 00K 0K PNP OFF K 00 Resistance at 0 K or above HEATER SERVICE CODES FL0: Open switch in safety circuit. FL1: Temperature Sensor is open or shorted. FL: Failed Ignition. FL3: Flame detected when no flame should exist. FL4: Hot Surface Ignitor problem. FL5: Brown-out condition exist. FL6: Signal to energize gas valve is not being sent by controller. FL7: Fireman switch circuit is open ACV DCA 00μ 000μ 0m 00m 10A hfe Temp Resistance Temp Resistance 50 F K Ohms 78 F K Ohms 51 F K Ohms 79 F K Ohms 5 F K Ohms 80 F 9.84 K Ohms 53 F K Ohms 81 F K Ohms 54 F K Ohms 8 F K Ohms 55 F K Ohms 83 F K Ohms 56 F K Ohms 84 F K Ohms 57 F K Ohms 85 F 8.53 K Ohms 58 F K Ohms 86 F K Ohms 59 F K Ohms 87 F K Ohms 60 F K Ohms 88 F K Ohms 61 F K Ohms 89 F K Ohms 6 F K Ohms 90 F K Ohms 63 F K Ohms 91 F K Ohms 64 F K Ohms 9 F K Ohms 65 F K Ohms 93 F K Ohms 66 F K Ohms 94 F K Ohms 67 F K Ohms 95 F K Ohms 68 F 1.49 K Ohms 96 F K Ohms 69 F K Ohms 97 F 6.38 K Ohms 70 F K Ohms 98 F K Ohms 71 F K Ohms 99 F K Ohms 7 F K Ohms 100 F 5.89 K Ohms 73 F K Ohms 101 F K Ohms 74 F K Ohms 10 F 5.57 K Ohms 75 F K Ohms 103 F K Ohms 76 F K Ohms 104 F 5.37 K Ohms 77 F K Ohms 11

12 LITE (LG - MILLIVOLT) TROUBLESHOOTING TEMPERATURE CONTROL FIREMAN S SWITCH BLOCK AquaLink RS te: Ten feet (10 ) maximum distance from heater to control. 3 3a, b FUSIBLE LINK GAS VALVE HIGH LIMIT 150 F (RED DOT) HIGH LIMIT 135 F TH 4 5 to to TH TH PRESSURE SWITCH to to PP PP 6a Orange PILOT GENERATOR POT POT Valve (TH) + (PP) Pilot SEN SEN TH/PP 6b Pilot PP-TH 1 PP to PP to PP-TH THERMISTOR 7 Set gas valve knob to pilot position. Set thermostat toggle to OFF. Try to light the pilot. Does pilot light? Does pilot stay on when gas valve knob is released? 500+ PP and PP-TH terminals? (1) 500+ both terminals of Fireman s wire of Pressure? 500+ and both terminals of Fuse Link? 4 1. Verify gas is on.. Check for air in gas line. 3. Is pilot tube clogged? 1. Check P/G output. 1. Check for shorted wires. 3. Check broken wires. 1. Check for low Pilot Generator output.. Check for partial shorts or loose wires. 3. Replace Pilot Generator. If voltage is found at one and not the other, replace Fuse Link. Check for Roll out, Soot, Down drafting, Low Gas Pressure, etc. Check that a control system (if installed) is calling for heat or Fireman s is closed. 1. Check each High Limit individually. (3a & b). Check if damage to disc, heads, exchanger. 3. Take Temperature Rise. (Water Flow?) 500+ Wire of Pressure? 5 Set rocker switch to ON Is there 00+ wire of Pressure? Perform Back Pressure Test. If PSI or more, replace switch. If less, check pump, filter, etc. for pressure problem. Is there 500+ TH/PP on Temp. Board? Is there 500+ mv Is there 00+ Valve (TH) TH terminal of Temp. Board? 6b the Gas Valve? 6a Check and/or replace Is there 500+ mv black wire from TH terminal of (TH) terminal of Temp. Gas Valve? Board and TH terminal 6a of Gas Valve. Move rocker switch to OFF. Rotate Gas Valve Knob to ON. Move rocker switch Replace to ON. Does heater fire? Gas Valve 5 Perform Thermistor Test. Replace Temp. Board Check rocker switch Disconnect Pot wires and jump pot terminals. If voltage drops to 00+ mv, replace Temp. Control (P/N R005800). 7 1

13 Temperature Control Testing Set Gas Valve Knob to PILOT position. Move heater rocker switch to ON. Set thermostat to maximum. Is there 00+ wire of Pressure? Is there 00+ TH terminal of the Gas Valve? Move rocker switch to OFF. Rotate Gas Valve Knob to ON. Move rocker switch to ON. Does heater fire? Temperature Control Is there 500+ TH/PP on Temp. Board? Is there 500+ Valve (TH) on Temp. Board? Orange Is there 500+ TH terminal of Gas Valve? Replace Gas Valve Check rocker switch Perform Thermistor Test, see below. Disconnect Pot wires and jump pot terminals. If voltage drops to 00+ mv, replace Temp. Control (P/N R005800). Replace Temp. Board Check and/or replace black wire from Valve (TH) terminal of Temp. Board and TH terminal of Gas Valve. Thermistor Test Remove thermistor leads from temperature board. Set meter to test resistance above 0 K Ohms. Using chart below, compare the actual water temperature to the resistance reading. Temp Resistance Temp Resistance from Pressure to Gas Valve (TH) T-Stat Board to Gas Valve (PP) (This is the common wire to provide power to the T-Stat Board) POT POT Valve (TH) SEN SEN + (PP) TH/PP Thermistor 10 K Ohms Total Millivolt Loss Test Set meter to VDC. Place one probe on PP-TH and the other probe on TH. The meter will display the total millivolt loss through the safety loop. Series One or older - 0 Millivolts loss or less. Series - 30 Millivolts loss or less. Laars Lite LLG or LG - 80 Millivolts loss or less Fusible Link PP-TH Terminal Gas Valve Pilot VDC To Temperature Board TH Terminal OFF DCV ACV DCA 0 00μ 000μ 00m 0m 00m 000K 10A 00K hfe 0K K 00 NPN PNP 50 F K Ohms 78 F K Ohms 51 F K Ohms 79 F K Ohms 5 F K Ohms 80 F 9.84 K Ohms 53 F K Ohms 81 F K Ohms 54 F K Ohms 8 F K Ohms 55 F K Ohms 83 F K Ohms 56 F K Ohms 84 F K Ohms 57 F K Ohms 85 F 8.53 K Ohms 58 F K Ohms 86 F K Ohms 59 F K Ohms 87 F K Ohms 60 F K Ohms 88 F K Ohms 61 F K Ohms 89 F K Ohms 6 F K Ohms 90 F K Ohms 63 F K Ohms 91 F K Ohms 64 F K Ohms 9 F K Ohms 65 F K Ohms 93 F K Ohms 66 F K Ohms 94 F K Ohms 67 F K Ohms 95 F K Ohms 68 F 1.49 K Ohms 96 F K Ohms 69 F K Ohms 97 F 6.38 K Ohms 70 F K Ohms 98 F K Ohms 71 F K Ohms 99 F K Ohms 7 F K Ohms 100 F 5.89 K Ohms 73 F K Ohms 101 F K Ohms 74 F K Ohms 10 F 5.57 K Ohms 75 F K Ohms 103 F K Ohms 76 F K Ohms 104 F 5.37 K Ohms 77 F K Ohms 13

14 LX OR LT TROUBLESHOOTING w/digital Ignition Control GRAY 4 Power Distr. Block BLACK Fan Low Pressure Transformer RED 1 4 VAC Ground 1 VAC YELLOW GREEN Fuse WH/YEL TRANSFORMER TERMINAL BAR #1958 Thermostat (LX = GUI or LT = T-Stat) IGNITION CONTROL TERMINAL BAR #1959 SAFETY LOOP TERMINAL BAR #1961 GAS VALVE TERMINAL BAR # K Ohms Thermistor YELLOW Temp Sensor MV MV 7a Gas Valve 6a F F 1 4a IGN/ IGN/ 40 L1 L 10 IGN/ FS TAN TAN 4 V FC Fenwal Ignition Control TH 5 7 IND VAL GND GREEN YELLOW/BLACK BROWN PURPLE RED RED Call for heat relay BLACK 3 YELLOW/BLACK BROWN PURPLE C Fan Pressure Air Flo Sw Hot Surface Igniter 6 BLACK Burner Flame Proving Rod AGS Pressure Fireman s Hi Limit 135 F Exhaust Limit Temp Fuse Hi Limit 150 F Link Low Pressure Hi Lim Sw Ext Sw 1 For 4 VAC tests, common probe (black) can be left on yellow wire of transformer or any chassis ground. STEP 1 - Check Transformer 4 VAC at red wire on Transformer? 1 VAC at white/yellow wire of Transformer? Check incoming power. (115 / 30 VAC) Make certain correct conversion block is installed. Replace transformer. Check incoming power. (115 / 30 VAC) Make certain correct conversion block is installed. Replace transformer. STEP - Check Fuse 4 VAC at red wire of transformer terminal bar? Check for short circuits in safety loop. Replace fuse STEP 3 - Check Safety Loop te: If fan is on skip to Step 4 at top of page. 4 VAC at first wire (black) Recheck transformer and fuse of safety loop terminal bar? Replace thermostat. 4 VAC at second wire (white) of safety loop terminal bar? 4 VAC at white wire on Pressure? Water pressure related problem. Clean filter, baskets, etc.. Do back pressure test. Replace Pressure. 4 VAC at third wire (white) of safety loop terminal bar? Is Fireman Block open? Make certain external control system is calling for heat. Thermostat is not calling for heat. Check thermistor, temperature setting. Replace thermostat. 4 VAC at fourth wire (white) of safety loop terminal bar? 4 VAC at fifth wire (white) of safety loop terminal bar? 4 VAC at sixth wire (white) of safety loop terminal bar? High Limit (es) open Replace both limits. Perform Temperature Rise Test. Fusible Link or Exhaust Temp Limit open 4 VAC on both sides of Fusible Link? Replace Fusible Link. Check for down draft, soot, and/or low gas pressure. 4 VAC at seventh wire (purple) of safety loop terminal bar? Reset Exhaust Temp Limit. Check for lock in flue and/or vent. 4 VAC at eighth wire (yellow/black) Air Pressure of safety loop terminal bar? open. Is fan on? 4 VAC at yellow/black 4 VAC at Is Fan on? wire of ignition control yellow/black wire of terminal bar? Air Pressure? Proceed to step 5. Replace Thermostat. Check wire connections 4 VAC on yellow/black at TH of Ignition Control? Check wire connections. Replace thermostat. Check wire connections. Replace thermostat. Check vacuum tube for kinks and or holes. Replace Air Pressure Sw. Check wire connections Next Page 14

15 STEP 4 - Check Fan Is Fan on? Remove connector at F1 & F 4a of Ignition Control. Perform continuity test between F1 & F terminals of Ignition Control. Is there continuity? Replace Ignition Control Perform these steps if fan never goes off. Check Fan wiring. Replace Fan. Remove connector at F1 & F of Ignition Control. Does Fan go off? Turn power off to heater, check for shorted wires, especially grey and black wires at F1 & F. STEP 5 - Start Ignition Sequence 4 VAC at purple wire of the Ignition Control Terminal bar 4 VAC at purple wire in terminal TH of the Ignition? 5 STEP 6- Check Ignitor Is Hot Surface Ignitor glowing? 6 Plug connector at F1 & F back in. Turn heater to off, wait at least 45 seconds for postpurge to finish. Perform continuity test between F1 & F terminals of the Ignition Control. Is there continuity? Check wire connections. Replace thermostat. If resistance test shows Ignitor is open, replace the Ignitor. If resistance test shows the Ignitor is shorted, locate and correct short, before replacing Ignitor. te if the Ignitor is shorted it might damage the Ignition Control. STEP 7- Check Gas Valve After 35 seconds of ignitor heat up, is there 4 VAC at VAL terminal of the Ignition Control? 4 VAC at brown wire in Ignition Control Terminal bar? Replace Ignition Control Check wire and connections. Turn power off. Disconnect Ignitor at 6a. Perform resistance test. Is resistance between 40 and 75 Ohms? Reconnect ignitor wires. Carefully check wiring. Turn power on. If ignitor does not glow after pre-purge, replace Ignition Control. Replace Ignition Control. Check wire and connections. SERVICE CODES LOW PRESSURE - Water pressure related problem or blown fuse. Clean filter and all baskets. Do a back pressure test. Check Fuse. If the fuse is blown, check for short circuits in the control wiring. HI LIM SW. Low water flow problem. High limit(s) open. Replace limit(s), do a Temperature Rise Test. EXT. SW. 1 - Fusible Link or Exhaust Temp. Limit open. Too much heat in the cabinet (Fusible Link) or flue (Exhaust Temp. Limit ). Fusible Link open; check for sooted heat exchanger, low gas pressure, down draft condition and or water flow problem. Do a Gas Pressure Test and Temperature Rise Test. Exhaust Temp Limit check for blockage of vent. AIR FLOW SW - Insufficient vacuum to close the air pressure switch. Make certain the fan is running. Check the air hose from the fan to the Air Pressure for holes and kinks. If the fan never switches to high speed replace the Ignition Control. AGS - Automatic Gas Shutdown simply means the Ignition Control did not sense flame rectification. Make certain all gas cocks are open, and there is sufficient gas pressure and volume (gas line sized properly). If the heater fires and then the flame goes out quickly, it indicates the rectification signal is not returning to the Ignition Control. Check for poor or missing ground wire. Temp Sensor - Water temperature sensor open or shorted. The sensor is a 10 K Ohms thermistor. A sensor failure may indicate poor water chemistry. Carefully test the water, concentrating on Total Alkalinity and ph. LX or LT TEMPERATURE RISE MODEL TEMP. DIFF. MINIMUM MAXIMUM VAC at brown wire in Gas Valve Terminal bar? Replace Thermostat. 4 VAC at brown wire at Gas Valve? 7a Check wire and connections. Does the heater fire? Make certain all gas valves are open. The correct fuel is provided to the heater, gas pressure and volume are correct. OK Replace the Gas Valve 15

16 LX OR LT low X TROUBLESHOOTING 4 Power Distr. Block GRAY BLACK Fan Transformer RED 1 4 VAC Ground Low Pressure Fuse 1 VAC WH/YEL YELLOW GREEN TRANSFORMER TERMINAL BAR Thermostat (LX = GUI or LT = T-Stat) IGNITION CONTROL TERMINAL BAR SAFETY LOOP TERMINAL BAR GAS VALVE TERMINAL BAR 10 K Ohms Thermistor Temp Sensor MV MV 7a Gas Valve YELLOW 6a F1 F 4 VAC 4a FC IGN 40 IGN 10 L1 5 FS PS 7 TH VAL GND RED Call for heat relay 3 YELLOW/BLACK BROWN C BLACK Hot Surface 6 Igniter BLACK GREEN BROWN YELLOW/BLACK PURPLE BLACK PURPLE Air Pressure Air Flo Sw 115/30 Power Burner Flame Proving Rod AGS Fireman s Water Pressure Hi Limit 135 F Exhaust Limit Temp Fusible Hi Limit 150 F Link Low Pressure Hi Lim Sw Ext Sw 1 For 4 VAC tests, common probe (black) can be left on yellow wire of transformer or any chassis ground. STEP 1 - Check Transformer 4 VAC at red wire on Transformer? 1 VAC at white/yellow wire of Transformer? Check incoming power. (115 / 30 VAC) Make certain correct conversion block is installed. Replace transformer. STEP - Check Fuse 4 VAC at red wire of transformer terminal bar? Check incoming power. (115 / 30 VAC) Make certain correct conversion block is installed. Replace transformer. Check for short circuits in safety loop. Replace fuse STEP 3 - Check Safety Loop te: If fan is on skip to Step 4 at top of page. 4 VAC at first wire (black) Recheck transformer and fuse of safety loop terminal bar? Replace thermostat. 4 VAC at second wire (white) of safety loop terminal bar? 4 VAC at third wire (white) of safety loop terminal bar? 4 VAC at white wire on Pressure? Water pressure related problem. Clean filter, baskets, etc.. Do back pressure test. Replace Pressure. Fireman Block open. Make certain external control system is calling for heat. Thermostat is not calling for heat. Check thermistor, temperature setting. Replace thermostat. 4 VAC at fourth wire (white) of safety loop terminal bar? 4 VAC at fifth wire (white) of safety loop terminal bar? 4 VAC at sixth wire (white) of safety loop terminal bar? High Limit (es) open Replace both limits. Perform Temperature Rise Test. Fusible Link or Exhaust Temp Limit open4 VAC on both sides of Fusible Link? Replace Fusible Link. Check for down draft, soot, and/or low gas pressure. 4 VAC at seventh wire (purple) of safety loop terminal bar? 4 VAC at eighth wire (yellow/black) of safety loop terminal bar? Replace Thermostat. 4 VAC at yellow/black wire of ignition control terminal bar? 4 VAC on yellow/black at TH of Ignition Control? Check wire connections Check wire connections. Replace thermostat. Reset Exhaust Temp Limit.Check for block in flue and/or vent. Check wire connections. Replace thermostat. Air Pressure open. Is fan on? 4 VAC at yellow/black wire of Air Pressure? Check vacuum tube for kinks and or holes. Replace Air Pressure. Check wire connections Next Page 16

17 STEP 4 - Check Fan Is Fan on? Remove connector at F1 & F 4a of Ignition Control. Perform continuity test between F1 & F terminals of Ignition Control. Is there continuity? Replace Ignition Control Perform these steps if fan never goes off. Check Fan wiring. Replace Fan. Remove connector at F1 & F of Ignition Control. Does Fan go off? Turn power off to heater, check for shorted wires, especially grey and black wires at F1 & F. STEP 5 - Start Ignition Sequence 4 VAC at purple wire of the Ignition Control Terminal bar 4 VAC at purple wire in terminal PS of the Ignition? 5 Has fan speed slowed? STEP 6- Check Ignitor Is Hot Surface Ignitor glowing? 6 Plug connector at F1 & F back in. Turn heater to off, wait at least 45 seconds for postpurge to finish. Perform continuity test between F1 & F terminals of the Ignition Control. Is there continuity? Check wire connections. Replace thermostat. If resistance test shows Ignitor is open, replace the Ignitor. If resistance test shows the Ignitor is shorted, locate and correct short, before replacing Ignitor. te if the Ignitor is shorted it might damage the Ignition Control. Replace Ignition Control Check wire and connections. Replace Ignition Control. Turn power off. Disconnect Ignitor at 6a. Perform resistance test. Is resistance between 40 and 75 Ohms? Reconnect ignitor wires. Carefully check wiring. Turn power on. If ignitor does not glow after prepurge, replace Ignition Control. SERVICE CODES LOW PRESSURE - Water pressure related problem or blown fuse. Clean filter and all baskets. Do a back pressure test. Check Fuse. If the fuse is blown, check for short circuits in the control wiring. HI LIM SW. Low water flow problem. High limit(s) open. Replace limit(s), do a Temperature Rise Test. EXT. SW. 1 - Fusible Link or Exhaust Temp. Limit open. Too much heat in the cabinet (Fusible Link) or flue (Exhaust Temp. Limit ). Fusible Link open; check for sooted heat exchanger, low gas pressure, down draft condition and or water flow problem. Do a Gas Pressure Test and Temperature Rise Test. Exhaust Temp Limit check for blockage of vent. AIR FLOW SW - Insufficient vacuum to close the air pressure switch. Make certain the fan is running. Check the air hose from the fan to the Air Pressure for holes and kinks. If the fan never switches to high speed replace the Ignition Control. AGS - Automatic Gas Shutdown simply means the Ignition Control did not sense flame rectification. Make certain all gas cocks are open, and there is sufficient gas pressure and volume (gas line sized properly). If the heater fires and then the flame goes out quickly, it indicates the rectification signal is not returning to the Ignition Control. Check for poor or missing ground wire. Temp Sensor - Water temperature sensor open or shorted. The sensor is a 10 K Ohms thermistor. A sensor failure may indicate poor water chemistry. Carefully test the water, concentrating on Total Alkalinity and ph. STEP 7- Check Gas Valve After 35 seconds of Ignitor heat up, is there 4 VAC at VAL terminal of the Ignition Control? 4 VAC at brown wire in Ignition Control Terminal bar? Replace Ignition Control. Check wire and connections. TEMPERATURE RISE TEMP. DIFF. MODEL LX or LT MINIMUM 4 36 MAXIMUM VAC at brown wire in Gas Valve Terminal bar? Replace Thermostat. 4 VAC at brown wire at Gas Valve? 7a Check wire and connections. Does the heater fire? Make certain all gas valves are open. The correct fuel is provided to the heater, gas pressure and volume are correct. OK Replace the Gas Valve 17

18 HiE TROUBLESHOOTING w/ Digital Ignition Control TEMPERATURE CONTROL HIGH LIMIT 135 F 4b HIGH LIMIT 150 F 6 VENTURI or DIFFERENTIAL PRESSURE SWITCH BURNER 4a PRESSURE SWITCH GAS VALVE Purple / FIREMAN S SWITCH CONNECTION 10 BURNER LIMIT Brown 10a VENT LIMIT FUSE Brown 9 10b 6a 6b TRANSFORMER THERMISTOR IGN 40 IGN 10 L1 L IGN/FS TH 7 IND VAL GND 1 F1 8 F 4V FC FENWAL DIGITAL IGNITION CONTROL 10 VAC ONLY Gray HOT SURFACE IGNITOR / FAN OR COMBUSTION BLOWER STEP 1 4 VAC at Transformer? STEP 4 VAC at wire of terminal block? STEP 3 4 VAC at wire of terminal block? STEP 4 4 VAC at wire of Pressure? STEP 5 4 VAC at wire of Pressure? STEP 6 4 VAC at / wire of Ignition Control? Go to Step 7 1. Check incoming power. Check Transformer wiring. 3. Replace Transformer. Fuse is blown. Look for short circuits. Do not jumper or bypass fuse. Replace fuse with same size & amperage. Check Fireman s switch. If a remote is installed make sure it is calling for heat. 1. Check each Limit individually. 4a & 4b. Check if damage to disc, head, exchanger. 3. Perform Temperature Rise Test. Is Pump On? Perform Back Pressure test. If PSI or more replace pressure switch. If less, check pump, filter, plumbing and heat exchanger for water flow restrictions. Is Temp Board calling for heat? Do Thermistor Test. Good Replace Temp Board. Failed Replace Thermistor. STEP 7 Is Fan On? STEP 8 4 VAC at TH of Ignition Control? STEP 9 Is Ignitor glowing STEP 10 4 VAC at Brown wire of Gas Valve? Does heater fire? Is there 10 VAC at F? 8 Check supply wire. Make sure there is 4 VAC at IND, if there is, replace Ignition Control. Is there 10 VAC at F1? Check wiring to Fan. If wiring is OK, replace Fan. 1. Check for vent blockage or dirty air filter.. Perform Air Flow Test. 3. Replace Venturi Pressure. Check Ignitor and supply wiring. Perform Ignitor Resistance Test. Replace Ignitor. 9 Check Burner and Vent Limits., but goes out after a few seconds. Heater is not sensing rectification. Check commons, make sure combustion chamber is grounded. If all is OK replace Ignition Control. 10a & 10b Is Gas Valve On? Do a supply side gas pressure test. Replace Gas valve. 18

19 Safety Circuit Test Leave black probe on Transformer terminal with yellow wire. Move red probe to each component Fireman s block Transformer 10 VAC Hot Surface Ignitor Test Ignitor must be disconnected from the Ignition Control and cool to the touch. Resistance through the Hot Surface Ignitor should be 40 to 75 Ohms. OFF DCV ACV DCA ACV above 30 V OFF DCV ACV DCA 0 00µ 000µ 00m 0m 00m 000K 10A 00K hfe 0K K 00 Test Hot Surface Ignitor at Ambient Temperature - range 40 to 75 Ohms- 0 00µ 000µ NPN PNP 00m 0m 00m 000K 10A 00K hfe 0K K 00 Wire NPN PNP Thermistor Test Chart Temp Resistance Temp Resistance Thermistor Test Remove thermistor leads from temperature board. Set meter to test resistance above 0 K Ohms. Using chart at the right, compare the actual water temperature to the resistance reading to determine if the thermistor is OK. Temperature Rise Test EHE (HI E) MODEL 350 NPN DCV m 0 000K 00K 0K PNP OFF K 00 MINIMUM 0 ACV DCA 00µ 000µ 0m 00m 10A hfe TEMP. DIFF. MAXIMUM 9 50 F K Ohms 78 F K Ohms 51 F K Ohms 79 F K Ohms 5 F K Ohms 80 F 9.84 K Ohms 53 F K Ohms 81 F K Ohms 54 F K Ohms 8 F K Ohms 55 F K Ohms 83 F K Ohms 56 F K Ohms 84 F K Ohms 57 F K Ohms 85 F 8.53 K Ohms 58 F K Ohms 86 F K Ohms 59 F K Ohms 87 F K Ohms 60 F K Ohms 88 F K Ohms 61 F K Ohms 89 F K Ohms 6 F K Ohms 90 F K Ohms 63 F K Ohms 91 F K Ohms 64 F K Ohms 9 F K Ohms 65 F K Ohms 93 F K Ohms 66 F K Ohms 94 F K Ohms 67 F K Ohms 95 F K Ohms 68 F 1.49 K Ohms 96 F K Ohms 69 F K Ohms 97 F 6.38 K Ohms 70 F K Ohms 98 F K Ohms 71 F K Ohms 99 F K Ohms 7 F K Ohms 100 F 5.89 K Ohms 73 F K Ohms 101 F K Ohms 74 F K Ohms 10 F 5.57 K Ohms 75 F K Ohms 103 F K Ohms 76 F K Ohms 104 F 5.37 K Ohms 77 F K Ohms 19

20 SERIES I & II SPARK IGNITION HEATER TROUBLESHOOTING STEP 1 4 VAC AT TRANSFORMER? 1) CHECK POWER SUPPLY ) CHECK WIRING 3) REPLACE TRANSFORMER STEP 6 4 VAC AT 6 BK/YELLOW WIRE OF IGN. CONTROL? IS TEMP BOARD SET CALLING FOR HEAT? STEP 4 VAC AT RED WIRE OF FUSE LINK? STEP 3 4 VAC AT WIRE OF FUSE LINK? 3 STEP 4 4 VAC AT 4 WIRE OF PRESSURE SWITCH? STEP 5 4 VAC AT 5 BLACK WIRE OR PRESSURE SWITCH? GO TO STEP 6 FUSE IS BLOWN. LOOK FOR SHORT OR OVERLOAD OF CONTROLS. DO T JUMPER OR BYPASS. FUSE PROTECTS TRANSFORMER TOO MUCH HEAT IN CONTROL AREA. LOOK FOR DOWNDRAFTING, ROLLOUT, SOOT, LOW GAS PRESSURE, REPLACE FUSE LINK. 1) CHECK EACH LIMIT INDIVIDUALLY. 4a 4b 4c. ) CHECK FOR DAMAGE TO DISC, HEADS, EXCHANGER. 3) TAKE TEMPERATURE RISE. 1) PERFORM BACK PRESSURE TEST. A. IF PSI OR MORE, REPLACE SWITCH. B. IF LESS, CHECK PUMP, FILTER, HEAT EXCHANGER OR ANY RESTRICTION TO FLOW IN SYSTEM STEP 7 7a 7b IS THERE A SPARK AT THE GAP? IS THERE A PILOT? STEP 8 4 VAC AT BROWN WIRE OF GAS VALVE? 8 REPLACE GAS VALVE DO THERMISTOR TEST. IS THERE VOLTAGE TO BK/YELLOW WIRE? 1) CHECK WIRES ) REPLACE IGNITION CONTROL REPLACE THERMISTOR 1) CHECK SPARK WIRE CONNECTIONS ) CHECK STAINLESS STEEL LEAD FOR GROUNDING 3) REPLACE IGNITION CONTROL REPLACE TEMP 6b BOARD 4 VAC AT ORANGE WIRE OF GAS VALVE? 1) CHECK FOR GAS ) REPLACE GAS VALVE 1) CHECK WIRES ) REPLACE IGN. CONTROL 6a Mat #0751, Rev. B 09/05 0

21 PILOT SERIES I & II MILLIVOLT HEATER TROUBLESHOOTING Fireman s Block R A Fusible Link R00100 High Limit (135q F) R C High Limit (150q F) R B Pressure R Gas Valve Natural - R Propane - R On/Off E A 5 6B Thermostat R ON Rear Header undant High Limit (75q F) R OFF 1 3 TH (3) 1 6 Generator W TP () TH/TP (1) DOES PILOT LIGHT? 1) VERIFY GAS IS ON. ) CHECK FOR AIR IN GAS LINE. 3) IS PILOT TUBE CLOGGED? 500 MV BETWEEN 5 TP & BLACK WIRE OF PRESSURE SWITCH? PERFORM BACK PRESSURE TEST. IF LESS THAN PSI, CHECK PUMP, FILTER, HEAT EXCHANGER OR ANY RESTRICTION TO FLOW IN SYSTEM. IF MORE THAN PSI, REPLACE SWITCH. DOES PILOT STAY ON WHEN GAS VALVE KB IS RELEASED? 500 MV AT TP AND TH/TP TERMINAL 1) CHECK PILOT GENERATOR OUTPUT ) CHECK FOR SHORTED OR GROUNDED WIRES. 3) CHECK REDUNDANT HIGH LIMIT (IF EQUIPPED) 4) CHECK PILOT COIL. 1) CHECK FOR LOW PILOT GENERATOR OUTPUT. ) CHECK FOR PARTIAL SHORTS OR LOOSE WIRES MV BETWEEN TP ON GAS VALVE AND TH TERMINAL? 6 DOES HEATER FIRE? CHECK VOLTAGE AT ON/OFF SWITCH 6a AND THERMOSTAT 6b. REPLACE AS NEEDED. REPLACE GAS VALVE 500 MV AT TP 3 TERMINAL AND BOTH ON FUSE LINK? 500 MV BETWEEN TP AND 4 WIRE OF PRESSURE SWITCH? IF VOLTAGE IS FOUND AT ONE AND T THE OTHER, REPLACE FUSE LINK. CHECK FOR ROLL OUT, SOOTING, DOWNDRAFTING, AND SPACE BETWEEN TILE AND EXCHANGER. 1) CHECK HIGH LIMITS INDIVIDUALLY. ) CHECK FOR BROKEN WIRES. 3) CHECK FOR LOOSE TERMINALS. 4) TAKE TEMPERATURE RISE. 4a 4b 4c DOES HEATER SHUT OFF AFTER RMAL OPERATION? IS HEATER OPERATION INTERMITTENT? 1) CHECK FOR STUCK GAS VALVE. ) CHECK FOR STUCK PRESSURE SWITCH. 3) CHECK FOR STUCK THERMOSTAT. DO MILLIVOLT LOSS TEST. MAT #0746, Rev. C 09/05 1

22 HOT SHOT (100K) HEATER TROUBLESHOOTING Temperature Control Laars Orange 3a Hi-Limit 3b 135 F Hi-Limit (150 F) 4a 4b Pressure POT POT Valve (TH) + (PP) 5b SEN SEN TH/PP Fusible Link Piezo Ignitor TH 5a to TH to TP Pilot Generator Pilot Gas Valve TP 1 TP/TH to TP/TH Thermistor Pilot Coil to TP Set gas valve knob to pilot position. Set rocker switch to OFF. Try to light the pilot. Does pilot light? Does pilot stay on when gas valve knob is released? 500+ PP and PP-TH terminals? (1) 500+ wire of from Hi-Limits to Pressure (4a) 500+ and both terminals of Fuse Link? () 1. Verify gas is on.. Check for air in gas line. 3. Is pilot tube clogged? 1. Check P/G output (1).. Check for shorted wires. 3. Check pilot coil. 1. Check for low Pilot Generator output.. Check for partial shorts or loose wires. 3. Replace Pilot Generator. If voltage is found at one and not the other, replace Fuse Link. Check for Roll out, Soot, Downdrafting, Low Gas Pressure, etc. 1. Check each High Limit individually. (3a&b). Check if damage to bypass or heat exchanger Wire of Pressure going to rocker switch? (4b) Set rocker switch to ON Is there 00+ wire of Pressure? (4b) Is there 00+ TH terminal of the Gas Valve? Move rocker switch to OFF. Rotate Gas Valve Knob to ON. Move rocker switch to ON. Does heater fire? Perform Back Pressure Test. If.5 PSI or more, replace switch. If less, check pump, filter, etc. for pressure problem. Is there 500+ TH/PP on Temp. Board? Is there 500+ Valve (TH) on Temp. Board? Is there 500+ TH terminal of Gas Valve? Replace Gas Valve Check rocker switch Check and/or replace black wire from Valve (TH) terminal of Temp. Board and TH terminal of Gas Valve. Perform Thermistor Test, see below. Disconnect Pot wires and jump pot terminals. If voltage drops to 00+ mv, replace Temp. Control (P/N R005800). Replace Temp. Board Mat #0754, Rev. C 09/05

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