TECHNICAL TRAINING INVERTERY Introduction TROUBLESHOOTING Technical Training CONTENTS

TECHNICAL TRAINING INVERTER-Y Introduction TROUBLESHOOTING Technical Training

CONTENTS Error Indication v Error Diagnosis & Troubleshooting Guide v Tools , Equipment v Technical Training

ERROR INDICATION Technical Training

ERROR INDICATION From indoor units When any error occurs, indoor LED display will keep blinking – green light: • The blinking pattern not indicate error details • The error details have to retrieved from handset in error code form. • LED blinks here Technical Training

ERROR INDICATION • Indoor : wireless handset -- G 17 (Mc. Quay) -- G 18 (Acson) New -- GS 01 (Mc. Quay) New -- GS 02 (Acson) : wired handset -- Netware 3 (standard for Ceiling Concealed) Technical Training

ERROR INDICATION Using wireless handset G 17/18 to retrieve error code: 1. For G 17, hold down ON TIMER CANCEL or OFF TIMER CANCEL for 5 seconds. For G 18, Hold down TIMER CANCEL for 5 seconds until “ ” indication flashes on the handset temperature display section. G 17 G 18 ON TIMER CANCEL OFF TIMER CANCEL Technical Training

ERROR INDICATION 2. Then, press the same button repeatedly. A series of error code will appear until ID buzzer produces a long beep. The corresponding error code is indicated on the handset temperature display section. 3. ID unit buzzer will produce a long beep if the handset error code matched with unit error. A short and two consecutive beeps is not the unit error. The code display will cancel itself if the button is not pressed for 1 minute. 4. 5. Technical Training

ERROR INDICATION How to retrieved last state error Remove battery from remote controller Replace battery again into remote controller ON/OFF button Mode button Press Mode & ON/OFF buttons together The “ 00 “ will show at temperature section ON TIMER CANCEL button OFF TIMER CANCEL button Press Mode button to 5: 00 Press ON/OFF once Repeat the normal step for faulty diagnosis by remote controller step Technical Training

ERROR INDICATION Using wireless handset GS 01/02: 1. Hold down ON TIMER CANCEL or OFF TIMER CANCEL for 5 seconds until “ ” indication flashes on the handset temperature display section. ON TIMER CANCEL OFF TIMER CANCEL Technical Training

ERROR INDICATION 2. Then, press the same button repeatedly. A series of error code will appear until ID buzzer produces a long beep. The corresponding error code is indicated on the handset temperature display section. 3. ID unit buzzer will produce a long beep if the handset error code matched with unit error. A short and two consecutive beeps is not the unit error. The code display will cancel itself if the button is not pressed for 1 minute. 4. 5. Technical Training

ERROR INDICATION Using wired handset Netware 3: v The error will show at last 2 digits of the clock display. v Netware 3 also can retrieved last state memory by : v Press SLEEP & TIMER ACTIVE simultaneously and the error will be flashed on the last 2 digits of the clock display. Technical Training

ERROR INDICATION Error code description for Y-series inverter : ERROR DESCRIPTION 5 LCY 10/15 DR 20/25 CR 5 LCY 10/15 ER 5 LCY 30/40/50/60 CR 5 MSY 20/25/30 BR 00 Normal √ √ 2 A 1 INDOOR PCB ERROR √ √ 3 A 3 DRAIN PUMP ABNORMAL √ x √ √ 4 A 5 ANTIFREEZE PROTECTION √ √ x √ 5 A 6 INDOOR FAN MOTOR ABNORMAL √ √ 6 A 7 AIR SWING MOTOR LOCK √ x √ √ 7 A 8 ABNORMAL POWER SUPPLY VOLTAGE x x √ x 8 C 4 INDOOR HEAT EXCHANGER THERMISTOR SHORT/OPEN √ √ 9 C 9 INDOOR ROOM THERMISTOR SHORT/OPEN √ √ No. ERROR CODE 1 = will be explain in error diagnosis Technical Training

ERROR INDICATION Error code description for Y-series inverter : ERROR DESCRIPTION 5 LCY 10/15 DR 20/25 CR 5 LCY 10/15 ER 5 LCY 30/40/50/60 CR 5 MSY 20/25/30 BR E 1 OUTDOOR PCB ERROR x √ √ √ 11 E 3 HIGH PRESSURE PROTECTION x x √ x 12 E 4 LOW PRESSURE PROTECTION x x √ x 13 E 5 COMPRESSOR OVERLOAD √ √ 14 E 6 COMPRESSOR LOCK /START-UP ERROR √ √ x √ 15 E 7 OUTDOOR FAN MOTOR LOCK √ √ 16 E 8 AC INPUT OVER CURRENT √ √ x √ 17 E 9 EXV ERROR x x √ x 18 EA 4 WAY VALVE ERROR x √ 19 F 3 DISCHARGE PIPE OVERHEAT √ √ No. ERROR CODE 10 Technical Training

ERROR INDICATION Error code description for Y-series inverter : ERROR DESCRIPTION 5 LCY 10/15 DR 20/25 CR 5 LCY 10/15 ER 5 LCY 30/40/50/60 CR 5 MSY 20/25/30 BR F 6 HEAT EXCHANGER OVERHEAT √ √ x √ 21 H 0 COMPRESSOR SENSOR SYSTEM ABNORMAL x √ 22 H 3 HIGH PRESSURE SWITCH ERROR x x √ x 23 H 6 POSITION SENSOR ABNORMAL ( compressor ) √ √ x √ 24 H 8 AC CURRENT SENSOR ERROR √ √ x √ 25 H 9 OUTDOOR AIR THERMISTOR SHORT/OPEN √ √ 26 J 1 PRESSURE SENSOR ERROR x x √ x 27 J 3 COMPRESSOR DISCHARGE PIPE THERMISTOR SHORT/OPEN/MISPLACED √ √ 28 J 5 SUCTION PIPE THERMISTOR SHORT/ OPEN x x √ X J 6 OUTDOOR HEAT EXCHANGER THERMISTOR SHORT/ OPEN √ √ N o. ERROR CODE 20 29 Technical Training

ERROR INDICATION Error code description for Y-series inverter : ERROR DESCRIPTION 5 LCY 10/15 DR 20/25 CR 5 LCY 10/15 ER 5 LCY 30/40/50/6 0 CR 5 MSY 20/25/30 BR J 7 SUBCOOLING HEAT EXCHANGER THERMISTOR SHORT/ OPEN x x √ x 31 J 8 LIQUID PIPE THERMISTOR SHORT/ OPEN x x √ √ 32 J 9 GAS PIPE THERMISTOR SHORT/ OPEN x x x √ 33 L 1 OUTDOOR PCB ERROR x x √ x 34 L 3 ELECTRICAL BOX TEMPERATURE RISE ( compressor off ) √ √ x √ 35 L 4 HEAT SINK OVERHEAT ( compressor on ) √ √ 36 L 5 IPM ERROR / IGBT ERROR ( output over current ) √ √ L 8 ELECTRONIC THERMAL ( time lag-compressor signal disorder position) x x √ x ERROR CODE 30 No. 37 Technical Training

ERROR INDICATION Error code description for Y-series inverter : ERROR DESCRIPTION 5 LCY 10/15 DR 20/25 CR 5 LCY 10/15 ER 5 LCY 30/40/50/60 CR 5 MSY 20/25/30 BR P 1 OPEN PHASE OR VOLTAGE UNBALANCE x x √ x 39 P 4 HEAT SINK THERMISTOR SHORT / OPEN √ √ 40 U 0 INSUFFICIENT GAS √ √ 41 U 2 DC VOLTAGE OUT OF RANGE √ √ 42 U 4 COMMUNICATION ERROR √ √ 43 UA INSTALLATION ERROR √ √ 44 UH ANTIFREEZE PROTECTION IN OTHER ROOM x x x √ No. ERROR CODE 38 Technical Training

ERROR INDICATION From outdoor unit : When unit error happen, the error will show at outdoor display. 1) 5 LCY-10/15 DR, 20/25 CR 2) 5 MSY-20/25/30 BR 3) 5 LCY-30/40/50/60 ER 4) 5 LCY-10/15 ER : 7 segment display : 5 LED light indicator : 2 LED light indicator : Nil Technical Training

ERROR INDICATION 1. 5 LCY-10/15 DR, 20/25 CR: 7 segment display v The 7 segment display is located inside outdoor unit control panel beside the terminal block. Control panel cover have to remove before access to the 7 segment display. Overall photo for slx 10, 25 Overall photo for control box slx 10, 25 Technical Training

ERROR INDICATION When there is no error, compressor running frequency is displayed. v When there is error, it flashes the error code as below: v Normal operation Flashing error code Technical Training

ERROR INDICATION In addition, 7 segment also can be use to retrieve unit operating condition such as running current, DC voltage, ambient temperature, indoor air temperature , etc. v By pressing the tact switch, the 7 segment will start to flash from “ 00”. Press again, it will show “ 01” and subsequent running number shows the parameter number. v Then, the 7 segment will flashing again showing the parameter measurement. v When the 7 segment display is left untouched for 5 min, the display will light off (Dim). v Technical Training

ERROR INDICATION For measurement of 125, the 7 segment will display as 25 first follow by 01 Technical Training

ERROR INDICATION 2. 5 MSY-20/25/30 BR: 5 LED display at display board v LED A – flashing GREEN LED indicates normal equipment condition. v. LED 1 - 4 – OFF condition of the red LED indicates normal equipment condition. v. LED 1 -4 -- blinking indicates error. Technical Training

ERROR INDICATION Error code for 5 MSY : Technical Training

ERROR INDICATION 3. 5 LCY-30/40/50/60 ER: 2 LED light indicator v LED HAP – flashing GREEN LED indicates normal condition. v LED HAP – OFF condition indicates power supply abnormal or faulty outdoor PCB v LED H 3 P – OFF condition of the red LED indicates normal condition. v LED H 3 P – ON condition indicates protection devices activate Technical Training

OTHERS v 5 LCY 30/40/50/60 display PCB guide : 5 LCY 30 ER Display PCB 5 LCY 40/50/60 ER Technical Training

ERROR INDICATION 4. 5 LCY-10/15 ER: Nil • For K-series inverter, the outdoor will not have error indicator, have to refer to indoor when error happen. Technical Training

ERROR DIAGNOSIS Technical Training

ERROR DIAGNOSIS ERROR A 1 : Indoor PCB error Error message : A 1 Method of malfunction detection : Malfunction decision condition causes Evaluation of zero- cross detection of power supply by indoor unit : When there is no zero-cross detection in 10 seconds continuously. : 1. ) Faulty indoor PCB 2. ) Faulty connector connection at indoor Troubleshooting flow : Turn off unit Check indoor PCB connector conditions ( including PCB to terminal block and all PCB wire connector) YES Any sign of loose or abnormal Connect correctly and operate again NO Replace indoor PCB and operate again Technical Training

ERROR DIAGNOSIS ERROR A 3 : Drain pump abnormal (for ceiling cassette unit) Error message : A 3 Method of malfunction detection : Malfunction decision condition causes Evaluation of water level upper limit and float switch condition : When water level reach upper limit and float switch turn off : 1. ) Faulty drain pump or float switch 2. ) Improper drain piping work or drain pipe blockage Troubleshooting flow : Turn off unit Check drain pump connector connect to indoor PCB YES Any sign of loose or abnormal Connect correctly and operate again NO Restart back operation Technical Training

ERROR DIAGNOSIS ERROR A 3 : Drain pump abnormal (for ceiling cassette unit) NO Drain pump works ? Change drain pump YES Drain water level abnormal high after sometimes ? YES NO Float switch connect to the PCB? NO Connect float switch YES NO Drainage system problem or blockage Check float switch have continuity? Change float switch YES Change indoor PCB Technical Training

ERROR DIAGNOSIS ERROR A 5 : Antifreeze Protection Error message : A 5 Method of malfunction detection : Malfunction decision condition causes Freeze-up protection control during cooling by detection of indoor heat exchanger thermistor. : When indoor heat exchanger thermistor less than 0 ◦ C. : 1. ) Indoor air filter , heat exchanger block. 2. ) Indoor air short circuit. 3. ) Indoor coil thermistor faulty, Indoor PCB faulty. Troubleshooting flow : Check indoor air flow YES Any air short circuit ? Provide sufficient air passage NO Check intake air filter Technical Training

ERROR DIAGNOSIS ERROR A 5 : Antifreeze Protection YES Is it very dirty ? Clean the air filter NO Check the dust accumulate at indoor coil YES Is it very dirty ? Clean the indoor coil Check indoor coil thermistor resistance # Refer to thermistor resistance table YES Does it conform to thermistor accuracy table? Change indoor PCB NO Change indoor coil thermistor Technical Training

ERROR DIAGNOSIS ERROR A 6 : Indoor fan motor abnormal Error message : A 6 Method of malfunction detection : Malfunction decision condition causes Rotation speed detected by the indoor PCB during fan motor running is used to determine this error. : When the detected motor rotation speed does not reach the target rotation speed by the program : 1. ) Indoor fan motor winding short, or the motor lead wire broken 2. )Indoor PCB faulty. Troubleshooting flow : Technical Training

ERROR DIAGNOSIS ERROR A 6 : Indoor fan motor abnormal Turn off power supply and rotate fan by hand NO Does it rotate ? Change fan motor YES Turn ON and run fan NO Does it rotate ? Change fan motor YES Change PCB Technical Training

OTHERS : v Inverter–Y series fan motor: 5 LCY 10/15 DR 5 LCY 5 MSY 20/25 CR 10/15 ER 20/25/30 BR 5 LCY 30/40/50/ 60 ER AC AC DC DC DC WM AC DC DC ------- CC, CK, CM AC AC ------- Outdoor Indoor Technical Training

ERROR DIAGNOSIS ERROR A 8 : Abnormal power supply voltage Error message : A 8 Method of malfunction detection : Malfunction decision condition causes Checking of input voltage : When the voltage detected out of range of ± 10 % of 240 V. : 1. ) Power supply problem or blackout. 2. ) Wiring problem or Indoor PCB faulty. Troubleshooting flow : Check the condition of power source : 1. ) voltage is 220 V-240 V± 10% 2. ) Check there is power open phase or wiring problem 3. ) Check power supplier fluctuation within 6 V YES Any problem as describe above? Correct the supply problem NO Possible of external factor such as blackout Technical Training

ERROR DIAGNOSIS ERROR C 4, C 9 : INDOOR HEAT EXCHANGER , ROOM THERMISTOR SHORT/OPEN Error message : C 4, C 9 Method of malfunction detection : Malfunction decision condition causes Temperature detected by thermistor : When thermistor input is > 4. 96 V or <0. 04 V during compressor operation. : 1. ) Thermistor , connector faulty. 2. ) Indoor PCB faulty. Troubleshooting flow : Check thermistor connector condition No Correct the problem Normal ? Yes Check thermistor resistance value # Refer thermistor resistance table No Normal ? Replace thermistor Replace PCB Technical Training

ERROR DIAGNOSIS ERROR C 4, C 9 Indoor heat exchanger thermistor v ( 5 WMY 10/15 JR ) Location of indoor coil thermistor: CN COIL Technical Training

ERROR DIAGNOSIS ERROR C 4, C 9 Indoor room thermistor v For room thermistor : WMY-J series, K-series = Chips type thermistor mount to the PCB. other indoor - copper sensor attached to return air location Air intake gap for room temperature sensing RTH 201 Unit design with air opening at the front panel to allow sufficient space for air flow & measurement Technical Training

ERROR DIAGNOSIS ERROR E 3 : High pressure protection (for 5 LCY 30 -60 ER) Error message : E 3 Method of malfunction detection : Malfunction decision condition causes Protection device check high pressure switch continuity : When the high pressure switch is turn off at 4 MPa. ( 580 psi ) , turn on at 3 MPa ( 435 psi ) : 1. ) faulty high pressure switch , connector or wire harness 2. ) Indoor filter , outdoor coil dirty. 3. ) Outdoor fan not running, unit overcharge, stop valve is closed. Troubleshooting flow : Check the installation condition No Open the stop valve Stop valve open? Yes High pressure switch connect to outdoor PCB? No Connect correctly Turn off unit. Wait for compressor stop 10 minutes Technical Training

ERROR DIAGNOSIS ERROR E 3 : High pressure protection (for 5 LCY 30 -60 ER) Have continuity for high pressure switch? No Replace high pressure switch Yes Check the abnormal unit high pressure condition # Refer how to check high pressure condition Yes Have abnormal condition? Correct the abnormal condition No Replace outdoor PCB Technical Training

v Outdoor high pressure condition check : Technical Training

ERROR DIAGNOSIS Installation condition : 5 LCY 10/15 DR Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow Follow this installation guidelines to avoid air short circuit Technical Training

ERROR DIAGNOSIS ERROR E 4 : Low pressure protection (for 5 LCY 30 -60 ER) Error message : E 4 Method of malfunction detection : Malfunction decision condition causes Protection device check low pressure switch continuity : When the pressure detected is < 0. 12 MPa ( 17 psi )for continues 5 minutes. : 1. ) faulty low pressure switch , faulty outdoor PCB 2. ) Stop valve closed, unit leakage or refrigerant not enough. 3. ) Abnormal refrigerant piping system , faulty EXV Troubleshooting flow : Stop valve open? No Open the stop valve Yes Low pressure switch connect to outdoor PCB? No Connect correctly Yes Measure the voltage between low pressure switch # Refer how to check low pressure voltage Technical Training

ERROR DIAGNOSIS ERROR E 4 : Low pressure protection (for 5 LCY 30 -60 ER) Relation between Voltage and pressure follow the graph? No Change the low pressure switch Yes No Is the refrigerant pressure abnormally low? Change the Outdoor PCB Yes Correct refrigerant system ( gas shortage, leakage or piping block ) # Refer how to check low pressure condition Technical Training

v Outdoor low pressure condition check : Technical Training

v Outdoor pressure sensor condition check : For 5 LCY 30 -60 ER pressure switch: PH = detected pressure ( MPa ) V = Output Dc voltage PH = 1. 38 V -0. 69 Technical Training

ERROR DIAGNOSIS ERROR E 5 : Compressor overload Error message : E 5 Method of malfunction detection : Malfunction decision condition causes Detected by compressor overload : When compressor overload activate twice. If active once, will be reset if not happen in following 60 mins. : 1. ) Stop valve , EXV defective 2. ) 4 wv , outdoor PCB defective 3. ) Refrigerant shortage, water mixed in the piping Troubleshooting flow : Turn off unit. Disconnect Compressor wire hardness ( U, V, W ) Check compressor winding resistance # Refer compressor resistance table No Resistance normal? Change compressor Yes Technical Training

ERROR DIAGNOSIS ERROR E 5 : Compressor overload Connect back wire and turn on unit Yes Compressor stop without running? Change outdoor PCB No Compressor run for sometimes. Check EXV, stop valve, refrigerant level, 4 WV and water in the piping, installation condition Technical Training

ERROR DIAGNOSIS v Inverter –Y series Compressor spec: 5 LCY 10/15 DR 5 LCY 20/25 CR 5 LCY 10/15 ER 5 MSY 20 BR 5 MSY 25/30 BR 5 LCY 30 ER 5 LCY 40/50/60 ER Compressor type Rotary (swing) Rotary (swing) rotary (swing) scroll Compressor manufacturer Panasonic Daikin Daikin Compressor model 5 RS 102 XBJ 01 2 YC 32 GXD 1 YC 23 AEXDA 2 YC 36 BXD 2 YC 45 BXD 2 YC 63 DXD JT-100 G-VD Compressor winding resistance ( U, V, W ) -Ω 0. 858 1. 18 1. 764 0. 828 0. 787 0. 31 motor 6 pole brushless motor 4 pole brushless motor General guide : 1) Resistance of compressor winding < 10 Ω consider Ok 2) All 3 terminal resistance value must be same. Technical Training

Other : v Inverter –Y series Compressor spec : 6 poles motor 4 poles motor Technical Training

ERROR DIAGNOSIS ERROR F 3 : Discharge pipe overheat Error message : F 3 Method of malfunction detection : Malfunction decision condition Compressor discharge thermistor is checked with discharge temperature control. : When compressor discharge temperature is at abnormal high level or rise suddenly. E. g. : 110 -120 degree C varies by model. 100 -110 degree C when compressor frequency low. causes : 1. Faulty discharge thermistor, compressor, Outdoor PCB 2. Refrigerant shortage Troubleshooting flow : Check discharge thermistor condition Any wire damage, not insert to connector? Yes Correct wiring No Check discharge thermistor resistance value # Refer resistance table : for discharge thermistor, different spec. Technical Training

ERROR DIAGNOSIS ERROR F 3 : Discharge pipe overheat Resistance value Normal? No Change discharge thermistor Yes Check refrigerant level, compressor, EXV & stop valve. Technical Training

ERROR DIAGNOSIS ERROR F 6 : Heat exchanger overheat Error message : F 6 Method of malfunction detection : Malfunction decision condition causes Detect heat exchanger ( outdoor coil ) temperature during cooling mode. : Activate when outdoor coil temperature exceed 65 º C. Error reset when temperature drop to 50º C. : 1. ) Faulty outdoor coil thermistor, faulty outdoor PCB 2. ) Installation space not enough, hot air short circuit, fan motor not running , coil dirty Troubleshooting flow : Check outdoor installation condition Yes Any abnormal? Change outdoor location, clean outdoor coil. No Check outdoor fan motor Technical Training

ERROR DIAGNOSIS ERROR F 6 : Heat exchanger overheat No Fan motor running smoothly? Change fan motor Yes Check outdoor coil thermistor resistance # Refer resistance table No Resistance normal? Change thermistor Yes Change outdoor PCB Technical Training

ERROR DIAGNOSIS ERROR H 0 : Compressor sensor system abnormal Error message : F 6 Method of malfunction detection : Malfunction decision condition causes Detect the compressor current and voltage before compressor start. : Detected DC voltage is too low or too high. No current detected when compressor start : 1. ) Outdoor PCB, compressor problem 2. ) Compressor wrong wiring, reactor not connected. Troubleshooting flow : Check reactor connection Yes Any abnormal? Connect back reactor No Check reactor resistance Technical Training

ERROR DIAGNOSIS ERROR H 0 : Compressor sensor system abnormal # disconnect the reactor wire and measure resistance between terminal Check reactor resistance No Change reactor <10 Ω ? Yes Check compressor resistance No <10 Ω ? Change compressor Yes Change outdoor PCB Technical Training

ERROR DIAGNOSIS ERROR H 9, J 3, J 5, J 6, J 7, J 8, J 9, P 4 : Outdoor Thermistor related abnormal Error message : H 9, J 3, J 5, J 6, J 7, J 8, J 9, P 4 Method of malfunction detection : Malfunction decision condition Detect the temperature detected by thermistor. : When thermistor is disconnected or short circuit during operation. J 3 is judged when compressor discharge thermistor temperature is smaller compare to the condenser thermistor temperature. causes : 1. ) Thermistor, connector problem 2. ) Outdoor PCB problem Troubleshooting flow : Check connector for thermistor with error Yes Thermistor disconnected or loose? Connect thermistor back No Check thermistor resistance # Refer thermistor spec and the table. Technical Training

ERROR DIAGNOSIS ERROR H 9, J 3, J 5, J 6, J 7, J 8, J 9, P 4 : Outdoor Thermistor related abnormal No Resistance value normal? Change thermistor Yes Change outdoor PCB H 9 : Outdoor air thermistor J 3 : Compressor discharge thermistor J 5 : Suction pipe thermistor (for 5 LCY 30 -60 model) J 6 : Outdoor heat exchanger thermistor J 7 : Sub-cool heat exchanger thermistor (for 5 LCY 30 -60 model) J 8 : Liquid pipe thermistor (for 5 LCY 30 -60, 5 MSY 20 -30) J 9 : Gas pipe thermistor (for 5 MSY 20 -30) P 4 : Heat sink thermistor (for 5 MSY 20 -30, 5 LCY 10 -15 ER, 5 LCY 10 -15 DR) Technical Training

ERROR DIAGNOSIS v Inverter –Y series Thermistor spec : Indoor Outdoor 5 LCY 10/15 DR 5 LCY 20/25 CR 5 LCY 10/15 ER 30/40/50/ 60 ER 5 MSY 20/25/30 BR WM 10 K 20 K ------ CC, CK, CM 10 K ------ 10 K 20 K -------20 K Except for discharge pipe thermistor =230 K (Refer 20 k table) 20 K Technical Training

v How to check thermistor resistance Use multi meter to check thermistor resistance value. Technical Training

v Inverter–Y series Thermistor spec : (10 KΩ) At 25 C Resistance value: 10 k Technical Training

v Inverter–Y series Thermistor spec : (20 KΩ) At 25 C Resistance value: 20 k Technical Training

v Inverter–Y series Thermistor spec : (discharge thermistor) Discharge thermistor spec for 5 LCY 30/40/50/60 Technical Training

ERROR DIAGNOSIS v For Outdoor 5 LCY 10/15 DR : Outdoor air thermistor with PVC protection sleeve All thermistor ( discharge, air, coil ) share a same connector and connect to PCB Outdoor discharge , heat exchanger Thermistor : copper type Technical Training

ERROR DIAGNOSIS ERROR L 3 : Electrical Box temperature rise (compressor off) Error message : L 3 Method of malfunction detection : Malfunction decision condition Detect the temperature of heat sink when compressor off. : Heat sink temperature >80 º C( MSY ), > 93 º C ( K-series ) when compressor off. Error reset when temperature drop < 70 º C. causes : 1. ) Outdoor fan , PCB problem 2. ) Heat sink thermistor, connector problem Technical Training

ERROR DIAGNOSIS ERROR L 3 : Electrical Box temperature rise (compressor off) Troubleshooting flow : Turn off the unit and turn on back after 20 mins No Error again ? # Refer thermistor spec and the table. Check outdoor fan Yes No Check heat sink thermistor resistance Change outdoor fan motor Outdoor fan functioning? Yes No No Resistance normal? Change thermistor Yes No Change outdoor PCB Heat sink temperature > 80 ºC ? Heat sink dirty? Check installation condition Yes Clean the heat sink Change heat sink or check outdoor fan condition Technical Training

ERROR DIAGNOSIS ERROR L 4 : Heat sink overheat (compressor on) Error message : L 4 Method of malfunction detection : Malfunction decision condition Detect the temperature of heat sink when compressor on. : Heat sink temperature >103º C( MSY ), > 93 º C ( K-series ) when compressor on. Error clear when not happen in the following 60 mins. causes : 1. ) Outdoor fan , PCB problem 2. ) Heat sink thermistor, connector problem Technical Training

ERROR DIAGNOSIS ERROR L 4 : Heat sink overheat (compressor on) Troubleshooting flow : Turn off the unit and turn on back after 20 mins No Error again ? # Refer thermistor spec and the table. Check outdoor fan Yes No Check heat sink thermistor resistance Outdoor fan functioning? Yes Change thermistor No Resistance normal? Yes Change outdoor PCB No Heat sink temperature > 93 ºC ? Change outdoor fan motor No Check installation condition Heat sink dirty? Yes Clean the heat sink Yes Change heat sink or check outdoor fan condition # Make sure condition of silicon grease apply to IPM , and diode bridge is good. Technical Training

v Application of silicon grease to IPM board and diode bridge : Technical Training

ERROR DIAGNOSIS v Bad condition of silicon grease can cause L 4 ( heat sink overheat ) L 5 ( IPM error ) Heat sink Silicon grease IPM board Technical Training

ERROR DIAGNOSIS v For Outdoor 5 LCY 10/15 DR : The heat sink thermistor is screw and connect the PCB ( port : CN HTSK ) Technical Training

ERROR DIAGNOSIS ERROR L 5 : IPM (inverter power module) / IGBT error (output over current) Error message : L 5 Method of malfunction detection : Malfunction decision condition Detect the output current that flows into IPM board inverter DC section. : When over current has been detected by IPM and feedback MCU. A position signal , speed signal error happen during compressor running. causes : 1. ) Over current due to IPM board, internal wiring, wire connector loose, PCB problem 2. ) Over current due to stop valve close, compressor failure, abnormal supply voltage. 3. ) Over current due to silicon grease not apply to the IPM board contact point properly. No Stop valve fully open? Open stop valve Yes Turn off the unit and turn on back after 20 mins Error again ? No Continue monitor for supply voltage, discharge, suction pressure, compressor overload, Check for silicon grease at IPM condition Yes Technical Training

ERROR DIAGNOSIS ERROR L 5 : IPM / IGBT error (output over current) Turn off the unit and disconnect compressor U, V, W wire Check compressor winding resistance Resistance normal No Change compressor Yes Change the Outdoor PCB Technical Training

ERROR DIAGNOSIS ERROR U 0 : Insufficient gas Error message : L 5 Method of malfunction detection : Checking compressor running frequency and input current. Checking compressor discharge temperature versus target discharge temperature and EXV opening. Malfunction decision condition : When input current is smaller compare to target current. When compressor discharge temperature is higher compare to target discharge temperature and the EXV opening is high( >450 pulse ) causes : 1. ) Refrigerant shortage, unit leakage 2. )Refrigerant piping system block, 3. ) EXV defective, thermistor disconnected, stop valve closed Technical Training

ERROR DIAGNOSIS ERROR U 0 : Insufficient gas Any thermistor disconnected? Yes Connect back No Stop valve closed? Yes Open stop valve No Check for EXV functioning? No Change EXV Yes Check for refrigerant level # How to check refrigerant level Technical Training

ERROR DIAGNOSIS ERROR U 0 : Insufficient gas Refrigerant level normal? No Check for leakage Yes Change thermistor, outdoor PCB or compressor Any leakage? Yes Repair the leak point No Add refrigerant Technical Training

v How to check refrigerant level - To set unit run in force cooling (unit will run at rated compressor fixed frequency). - Connect pressure gauge outdoor suction service valve and measure the suction pressure. - Ideal suction pressure level : 125 -150 psi (depends on the outdoor ambient temperature). Technical Training

ERROR DIAGNOSIS Press & hold - Press and hold on the ID ON/OFF button for 5 -9 s when unit is in standby mode. - Set to high fan mode and temperature at 16 °C using remote controller Technical Training

ERROR DIAGNOSIS ERROR U 4 : Communication error (between indoor and outdoor) Error message : U 4 Method of malfunction detection : Data received from the outdoor unit in indoor unit -outdoor unit signal transmission is checked whether it is normal. Malfunction decision condition : When the data send from the outdoor cannot be received in ( XX second ) or the data content is abnormal. causes : 1. ) Faulty indoor, outdoor PCB 2. )Indoor-outdoor signal wire line wiring error ( loose or broken ). 3. ) External noise, power supply waveform disturbance Check indoor-outdoor wiring connection #Refer wiring check Any wiring problem? Yes Correct the wiring No Check outdoor unit PCB “ status LED “ Technical Training

ERROR DIAGNOSIS ERROR U 4 : Communication error (between indoor and outdoor) No LED light on? Change outdoor PCB Yes Check voltage of indoor-outdoor connection between No. 1 -No. 3 and No. 2 -No. 3 Voltage =0? Yes Replace connection between indoor and outdoor No Check power supply waveform Any disturbance? #Refer supply waveform check Yes Find the source of power disturbance and correct it No Replace indoor unit PCB , external noise ( interference ) Technical Training

v Wiring – How to check communication wire : v Maximum communication wire length: 50 meters v Make sure the recommended type of wire is used v Check for loose connection Technical Training

v Power supply disturbance check v Using power analyzer to check the supply voltage Technical Training

ERROR DIAGNOSIS ERROR UA : Installation error Error message : UA Method of malfunction detection : Detected different type of transmission signal ( for different model ) Malfunction decision condition : When detected different coupling of indoor-outdoor unit. causes : 1. ) Outdoor and indoor unit not match ( wrong model , horsepower, ) 2. )Wrong indoor-outdoor PCB. 3. ) External noise, power supply waveform disturbance 1. X-series inverter unit can not couple with Y-series inverter 2. K-series inverter unit can not couple with X, Y series inverter and only available in 1. 0 , 1. 5 Hose power. Technical Training

ERROR DIAGNOSIS ERROR UA : Installation error 5 WMY 10/15 JR 5 LCY 10/15 DR Technical Training

TOOLS & EQUIPMENT Technical Training

TOOLS & EQUIPMENT v Digital clamp meter v Digital multi-meter : to check resistance , voltage, current, wire continuity AC CURRENT RESISTANT AC VOLTAGE Technical Training

TOOLS & EQUIPMENT v Manifold (pressure) gauge and hose Gauge : High side : 800 psig Low side : 250 psig for low-side (500 low-side retard) Hose : rated 800 psig Technical Training