6. Troubleshooting. 6-1 Basic items for trouble shooting. Samsung Electronics 17

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1 6. Troubleshooting Since the inverter air conditioner is equipped with Electrical control circuits at both Indoor & outdoor unit, the trouble shooting shall be performed according to the error mode. Inside the controller of the outdoor unit (inverter), the large capacity of electrolytic condenser so that it takes the time to discharge after the power off since the electrical charge remains(the charging voltage DC 340V). Take care of the electrical shock by contact on the charging part before the discharge after the power off. (It takes approximately 2 minutes to discharge). 6-1 Basic items for trouble shooting 1. Is the power source proper? The power source shall be in the range of the rated voltage ±10%. If it is out of this range, it may cause the abnormal operation. 2. Is the connection made between the indoor and outdoor unit? The connection between indoor and outdoor unit shall be performed with 4 wire. (connection cable of indoor and outdoor unit + ground wire). 3. The phenomena as follows are not out of order. No Phenomena The operation is not done. The wind comes out but the heating/cooling is not performed. The remote controller does not operate. The wind volume is not adjusted. The temperature is not set. The operation lamp continues to be flickering. The immediate operation starts without control of remote controller when plugged Cause and reason Is the power off or the power unplugged? Does it stop because it is the completion time? Unplug and plug again the power source for 2 minutes. Is the filter clogged with dust or dirty? Is there any direct light on the outdoor unit or any obstacle against it? Is the selected temperature too high? Lower the selected temperature lower than the current one (during cooling). Is the selected temperature too low? Raise the desired temperature than the current one? (during heating) Is the "Fan only Mode" operation? Is the battery run out? Is the battery inserted in the wrong way(+, -)? Is the detection part of the indoor unit blocked? Does it interfered with the radio of neon sign? Is the operation selected among one of Auto / Dry / Turbo / Sleeping? The temperature setting is not required since the wind volume set automatically. Check again at the state of Cooling / Fan only / Heating. Is the operation selected among the Dry / Turbo / Sleeping / Fan only Mode. Since the temperature is automatically set, the temperature setting is not required. Check again at the cooling / heating state. The standard temperature ±2 C during the automatic operation. Push the Operation / Stop button. Unplug and plug the power source. It is the case that the auto restart function works. Auto restart function is the convenient function where the operation state is memorized in the Memory IC during the blackout and the operation restarts when the power comes back. Samsung Electronics 17

6-2 The first determination method of troubled part 6-2-1 Error mode display of indoor unit TEMPERATURE / ERROR CODE ERROR CODE DISPLAY Discription Indoor Unit Indoor unit room temperature sensor

2 6-2 The first determination method of troubled part Error mode display of indoor unit TEMPERATURE / ERROR CODE ERROR CODE DISPLAY Discription Indoor Unit Indoor unit room temperature sensor error (open / short) Indoor unit heat exchanger out temperature sensor error(open / short) Indoor unit heat exchanger in temperature sensor error(open / short) EEPROM error Option code setting error Indoor fan motor malfunction Communication error or miss-wiring error Communication error between the indoor unit and outdoor unit Compressor protection error increase of operation current increase of OLP temperature increase of discharge temperature Over current of IPM circuit increase of heatsink temperature BLCD compressor starting error Outdoor unit sensor error (open / short) deice temp-sensor outdoor temp-sensor discharge temp-sensor OLP temp-sensor Outdoor control PCB error Communication error between 2 micom on the outdoor PCB current sensor error heatsink temp-sensor error Voltage sensor error INDOOR PCB Option Code Fan and cable Check point OUTDOOR PCB, Cable between Indoor and outdoor unit Comp. Fan Fan Comp. PCB,Comp wire PCB PCB PCB PCB, Outlet voltage Error display : / / and 2-digit-number are displayed alternately 18 Samsung Electronics

6-2-2 Error mode display of outdoor unit board RED GRN YEL ULN2003 LAMP of Display Monitor YELLOW GREEN RED Power Off / VDD NG Comp. Peak Current (O.C.) Communication NG Comp.

3 6-2-2 Error mode display of outdoor unit board RED GRN YEL ULN2003 LAMP of Display Monitor YELLOW GREEN RED Power Off / VDD NG Comp. Peak Current (O.C.) Communication NG Comp. Starting error Heatsink sensor error Operation DC-Iink overvoltage error 4-Way valve error Heatsink Temp. trip Outdoor Sensor error(open/short) Discharge sensor temp. trip Discharge sensor error(open/short) OLP sensor error(open/short) CT sensor error Unit Over Current protection Deice sensor error(open/short) OLP sensor temp. trip OPTION error (EEPROM) Compressor rotation error DC fan error (SH12BWH only) DC-Link voltage sensor error PFC OC error NO GAS error AC Line zero-crossing error Description : Lamp on : Lamp flickering : Lamp off Samsung Electronics 19

4 6-3 Sequence of trouble shooting for inverter aircon OPERATION START The indoor unit does not work even though the power is plugged. There is no sound "DING" The lamp is not on the display. Check the indoor unit control board. (A) The indoor unit does not work when operated by the remocon. Checking the Remocon.(B) Check the control board and display board of indoor unit.(c) The 2 digit part of indoor LED display shows Error Code and the unit stops several minutes after the indoor uint starts. Check the error code on the LED display(a), (D)-(O) In case of Error Code : Er/E1(D), Er/E5(D), Er/05(D), Er/06(A), E3/01(E) Check the indoor unit In case of Error Code : Er/09 See section 5. Setup the model option In case of Error Code : E3/01 (F) Check the communication line In case of Error Code : E3/E6(H), Er/17(K), In case of Error Code : Er/31(H), Er/32(G), Er/33(G), Er/36(K), In case of Error Code : Er/37(I), Er/38(K) Check the outdoor unit In case of Error Code : Er/11(J), Er/12(M), Er/13(M), Er/14(L), In case of Error Code : Er/15(N), Er/18(O) Check the outdoor unit and outdoor unit installation 20 Samsung Electronics

5 6-3-1 (A) Check of indoor unit control board Unplug the power cord and plug it after 5 seconds. Press the on/off switch located indoor unit inside to operate the air conditioner. If the air conditioner operates, check the remocon and indoor unit display board. If the air conditioner does not operates, check according to the sequence of the followings: Check sequence of indoor unit control board Step 1 : Check whether two wires of power cord (Sky-blue, brown) are connected correctly to the terminal block and Relay on the control board. Step 1 : Sky -blue : connected to "N1" of Terminal block Step 1 : Brown : connected to RY71 Tab terminal (control board outer side) Step 2 : Check whether the wire connected to the terminal block is connected to th control board. (Control board) CN71 RY71 CN71 SKY-BLU BRN BLK (Terminal block) (N1) 1 2 Step 3 : Check whether the fuse (F701)(F702) on the control board is normal. (3.15[A]/250[V]:F701) (1[A]/250[V]:F702) Step 1 : If the fuse is broken, replace it with new one. Step 4 : Check the output voltage of SMPS on the control board. Step 1 : Input power AC178 ~ AC 264V CN22 1-3pin : DC12V Step 1 : - Input power AC178 ~ AC 264V CN22 2-3pin : DC5V Step 1 : - CN22 : As socket not mounted measure at the solder points Step 5 : Check whether the control board gets wet with dew Step 1 : Dry the control board. Step 6 : Check whether tiny metal objects make a short fircuit on the PCB, especially between pins of the surface mount IC. Step 1 : remove the objects. Do not use splay solvent or some components may get damage by solvent (B)(C) Display board and remocon check of indoor unit Check whether the connection wire of Display board is correctly connected to CN53 connector. Check the voltage of remocon battery. - the voltage of one battery shall be higher than about 1.4V, and then the remocon operates normally. Check whether the neon sign is on and the 3 wave long fluorescent lamp is on around the indoor unit. - After putting all lamps of the indoor out and then operate it by remocon. If it operates with the remocon, it is the abnormality due to the interference from the light of lamps. (Aircon unit is normal) (D) Check the indoor temperature sensor and indoor heat exchanger temperature sensor. Take out the thermistor connected to the connector (CN41,CN42) of control board of indoor unit and measure the resistance between two wires and if it is same as follows: it is normal but if not, replace it. Ambient temperature ( C) thermistor [KΩ] 15 C 20 C 25 C 30 C 35 C 40 C Samsung Electronics 21

6 6-3-4 (E) Check of indoor unit fan motor 1. Check whether the wires are connected surely between control board(cn72) and running capacitor(tab). 1. Check whether the wire of fan motor is connected to the control board (CN73,CN74) of indoor unit. 1. Check whether the error mode displays after the strong rotation for approximately 15 seconds since air conditioner turned on. 1. In case the error code displays after the fan motor is rotating for 15 seconds. Defect of HALL IC of fan motor and/or control board. 1. In case that error code displays without fan motor rotating after 15 seconds. Operate with making short circuit of AC side pins of SSR(SS71) of indoor unit control board. And then if the fan motor does not operate, it is the fan motor defect. If it rotates, it is the defect of control board(ss71,ic05,ic04) (F) Check of communication line between the indoor unit and outdoor unit Communication error mode 1. Check of connection 1. Check whether the cable wire connecting the indoor unit with outdoor unit is correctly connected to the (N1), 1, 2 terminal. (If the wire is connected reversely, the communication error occurs) 1. If the cable connecting the indoor unit and outdoor unit is longer than 20m, error mode may occur (shorten the cable length). Check of indoor unit Check whether the connection wire of the terminal block and control board of indoor unit is correct. (Control board) CN71 RY71 CN71 SKY-BLU BRN BLK (Terminal block) (N1) 1 2 Check of outdoor unit Check whether the connection wire of the terminal block and control board of outdoor unit is correct. (Control board) TB-N TB-L CN04 SKY-BLU BRN BLK (Terminal block) (N1) Check of power supply to the outdoor unit 2. After operation of aircon, select the turbo mode and approximately 3minutes later, check whether the red color lamp of control board (to be seen if the top cover of outdoor unit) is on. 2. If the red lamp (LED 3) is not on, check the power part of control board of outdoor unit. 2. Check the connection of reactor. 2. If the red lamp (LED 3) is on and green lamp is flickering, it is normal (G) Check of discharge temperature sensor and comp top OLP temperature sensor. Connector of outdoor unit control board (PIN#3,4 of CN51 - discharge temperature sensor), (PIN#1,2 of CN52-OLP Temperature sensor) Measure the resistance between two wires and if it is same as follows, it is normal but if not, replace. Ambient temperature ( C) thermistor [KΩ] 0 C 10 C 20 C 30 C 40 C 50 C Samsung Electronics

7 6-3-7 (H) Check the defrost temperature sensor and outdoor temperature sensor. Connector of outdoor unit control board (PIN#1,2 of CN51 - outdoor temperature sensor),(pin#3,4 of CN52-deice Temperature sensor) Measure the resistance between two wires and if it is same as follows, it is normal but if not, replace it. Ambient temperature ( C) thermistor [KΩ] 15 C 20 C 25 C 30 C 35 C 40 C (I) Check the heatsink temperature sensor of IPM This sensor is inside of the IPM module and PIN#24,25 of IPM module are the sensor terminal. Usually PIN solder crack or short circuit with small metal object cause sensor error. Check the object to make short circuit and solder condition of these pins. Ambient temperature ( C) thermistor [KΩ] 15 C 20 C 25 C 30 C 35 C 40 C (J) Check of operation current abnormal increase mode The operation abnormal current mode is the protection control for the safe operation by detecting the operation current of inverter aircon by the current sensor on the control board. If the operation current abnormal increase occurs, The ventilation is not good because the outdoor unit is installed wrong (the ambient temperature is higher than 50 C) Reinstall the outdoor unit so that the good ventilation can be made. If the Refrigerant is overcharged. Check the amount of Refrigerant. If the comp is locked. Replace the comp. If the comp is operating without the revolution of fan motor. Check the fan motor connector, replace the fan motor. If the protection cover is operating with bending to the outdoor. Take out the protection cover. If two outdoor units are operating face to face. (the bad ventilation is made) Reinstall the outdoor unit for the good ventilation. The air circulation is bad due to the attachment of falling leaves Take away the leaves for the good ventilation. Check and clean the dirt of current sensor block of outdoor control board. especially IC83 pin solder C437 47uF R459 33K R K (K) Check of Current sensor, Voltage sensor and Communication between 2 micom on the board. These errors are from component trouble on the outdoor control board. Replace the outdoor control board Samsung Electronics 23

8 (L) Check of instantaneous over-current protection of IPM circuit. Inverter instantaneous over-current protection mode is the mode to be actuated in order to prevent the damage of elements from the peak current of IPM circuit elements. In case that the inverter circuit instantaneous over-current protection mode actuates. condition of installation The ventilation is not good because the outdoor unit is installed wrong (the ambient temperature is higher than 50 ( C) ) Reinstall the outdoor unit so that the good ventilation can be made. In case that the operation is made with the cover bent of the outdoor unit. Take out the cover. If two outdoor units are operating face to face, (the bad ventilation is made) Reinstall the outdoor unit for the good ventilation. The air circulation is bad due to the attachment of falling leaves. Take away the leaves for the good ventilation. If the Refrigerant is overcharged. Check the amount of Refrigerant. Unit defect If the comp is locked. Replace the comp. If the comp is operating without the revolution of fan motor. Check the fan motor connector and replace the fan motor. In case the parts of the control board is damaged. Replace the outdoor control board (M) Check of the comp discharge gas temperature and OLP temperature abnormal rise. If the comp discharge gas temperature and OLP temperature rises higher than a certain level, it protects the circuit. If the comp discharge gas temperature and OLP temperature rises abnormally, Condition of installation The ventilation is not good because the outdoor unit is installed wrong (the ambient temperature is higher than 50 ( C) ) Reinstall the outdoor unit so that the good ventilation can be made. In case that the operation is made with the cover bent of the outdoor unit. Take out the cover. If two outdoor units are operating face to face, (the bad ventilation is made) Reinstall the outdoor unit for the good ventilation. The air circulation is bad due to the attachment of falling leaves Take away the leaves for the good ventilation. If the refrigerant is insufficient. Fill up the amount of refrigerant. Unit defect If the comp is locked. Replace the comp. If the comp is operating without the revolution of fan motor Take out the protection cover. Check the fan motor connector and replace the fan motor. 24 Samsung Electronics

9 (N) Check of the heatsink temperature abnormal rise If the air flow around the heatsink on the control box is not good, heatsink temperature will go up and the control box will have damage. So controller check the heatsink temperature and protect at the cirtain limit. Possible troubles are fan motor trouble, fan motor drive circuit trouble and air flow blocking. Condition of installation The ventilation is not good because the outdoor unit is installed wrong (the ambient temperature is higher than 50( C)). Reinstall the outdoor unit so that the ventilation can be made. In case that the operation is made with the cover bent of the outdoor unit. Take out the cover. If two outdoor unit are operatong face to face,(the bad ventilation is made) Reinstall the outdoorunit for the good ventilation. The air circulation is bad due to the attachement of falling leaves. Take away the leaves for the good ventilation. If the refrigerant is insufficient. Fill up the amount of refrigerant. Unit defect If the fan is locked with some object. Remove the object. If the comp is operationg without the revolution of fan motor. Take out the protection cover Check the fan motor connector(cn54), running capacitor, relay(ry503) and replace the fan motor (O) Check BLDC compressor starting error If the compressor have some trouble inside like locking or gas pressure of suction and discharge pipe is not balanced, Inverter system will give up compressor rotation control to protect itself from overcurrent. In case of compressor rotation starting trouble without overcurrent condition, controller detect the compressor rotation error and stop. Compressor wire connection is not good. Check Compressor TAB terminal connection of the wire and connector to control box. Gas pressure balance is not good at stop condition. Check service valve open. Check EEV motor attachement and connector. Compressor is locked or have some mechanical damage. Replace the compressor. Samsung Electronics 25

10 (P) Check no gas error Charge standard amount of refrigerant (Q) Check of 4-Way valve Check whether the wires of 4-Way valve and control board of outdoor units correct. If it is normal, replace 4-Way valve (R) Check of outdoor unit fan motor (SH12BPH only) Check whether the wire of fan motor is connected to the control board (CN01) of outdoor unit. Check the voltage on the control board of outdoor unit and if it is same as follows, replace fan motor. Input power AC178V~AC264V. CN01 1-3pin : DC250V±10% ~ DC370V±10% CN01 4-3pin : DC15V 26 Samsung Electronics

11 6-4 Fault Diagnosis of Major Parts Part Indoor "Temp.Sensor" Indoor "Heat ex. Sensor" Outdoor "Temp.Sensor" Outdoor "Deice Temp. Sensor" Diagnosis Measure resistance with a tester. Ambient temperature 15 C 20 C 25 C 30 C 35 C 40 C thermistor[kω] Outdoor "Discharge Temp.Sensor" Outdoor "OLP Temp.Sensor", OΩ open or short Ambient temperature 0 C 10 C 20 C 30 C 40 C 50 C thermistor[kω] , OΩ open or short Indoor Fan Motor Measure the voltage between terminals (CN72) with a tester At ambient temperature (10 C ~ 30 C) between Voltage[V] Red, Blue 410±10% Main Red, Yellow 325±10% Sub Measure the voltage between ground and signal wire of the fan motor between Gray, Orange Yellow, Orange Voltage 0.5V~4.5V 5V if voltage does not change from 0V to 5V. Outdoor Fan Motor At ambient temperature (10 C ~ 30 C) between Resistance[Ω] Black, Red 275±10% Main Black, Yellow 350±10% Sub, OΩ open or short Stepping Motor (UP/DOWN swing motor) Measure resistance between red wire and each terminal. Approx. 290Ω at ambient temperature (20 C ~30 C), OΩ open or short Stepping Motor (FRONT GRILLE motor) Measure resistance between red wire and each terminal. Approx. 110Ω at ambient temperature (20 C ~30 C), OΩ open or short Samsung Electronics 27

No Operation of air conditioner Explanation

No Operation of air conditioner Explanation 12. Troubleshooting 12-1 Items to be checked first 1. The input voltage should be rating voltage ±10% range. The air conditioner may not operate properly if the voltage is out of this range. 2. Is the