4 ERROR INDICATION From indoor units When any error occurs, indoor LED display will keep blinking – green light:The blinking pattern not indicate error detailsThe error details have to retrieved from handsetin error code form.LED blinks here
6 ERROR INDICATION Using wireless handset G17/18 to retrieve error code: For G17, hold down ON TIMER CANCEL or OFF TIMER CANCEL for 5 seconds. For G18, Hold down TIMER CANCEL for 5 seconds until “ ” indication flashes on the handset temperature display section.G18G17ON TIMER CANCELOFF TIMER CANCEL
7 ERROR INDICATIONThen, 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.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.
8 OFF TIMER CANCEL button ERROR INDICATIONHow to retrieved last state errorRemove battery from remote controllerReplace battery again into remote controllerPress Mode & ON/OFF buttons togetherThe “ 00 “ will show at temperature sectionPress Mode button to 5:00Press ON/OFF onceRepeat the normal step for faulty diagnosis by remote controller stepON/OFF buttonMode buttonOFF TIMER CANCEL buttonON TIMER CANCEL button
9 ERROR INDICATION Using wireless handset GS01/02: Hold down ON TIMER CANCEL or OFF TIMER CANCEL for 5 seconds until “ ” indication flashes on the handset temperature display section.ON TIMER CANCELOFF TIMER CANCEL
10 ERROR INDICATIONThen, 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.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.
11 ERROR INDICATION Using wired handset Netware 3: The error will show at last 2 digits of the clock display.Netware 3 also can retrieved last state memory by :Press SLEEP & TIMER ACTIVE simultaneously and the error will be flashed on the last 2 digits of the clock display.
12 ERROR INDICATION Error code description for Y-series inverter : No. ERROR DESCRIPTION5LCY10/15 DR 20/25 CR5LCY 10/15 ER5LCY 30/40/50/60 CR5MSY20/25/30 BR100Normal√2A1INDOOR PCB ERROR3A3DRAIN PUMP ABNORMALx4A5ANTIFREEZE PROTECTION5A6INDOOR FAN MOTOR ABNORMAL6A7AIR SWING MOTOR LOCK7A8ABNORMAL POWER SUPPLY VOLTAGE8C4INDOOR HEAT EXCHANGER THERMISTOR SHORT/OPEN9C9INDOOR ROOM THERMISTOR SHORT/OPEN= will be explain in error diagnosis
13 ERROR INDICATION Error code description for Y-series inverter : No. ERROR DESCRIPTION5LCY10/15 DR 20/25 CR10/15ER5LCY 30/40/50/60 CR5MSY20/25/30 BR10E1OUTDOOR PCB ERRORx√11E3HIGH PRESSURE PROTECTION12E4LOW PRESSURE PROTECTION13E5COMPRESSOR OVERLOAD14E6COMPRESSOR LOCK /START-UP ERROR15E7OUTDOOR FAN MOTOR LOCK16E8AC INPUT OVER CURRENT17E9EXV ERROR18EA4 WAY VALVE ERROR19F3DISCHARGE PIPE OVERHEAT
14 ERROR INDICATION Error code description for Y-series inverter : No. ERROR DESCRIPTION5LCY10/15 DR 20/25 CR5LCY 10/15 ER5LCY 30/40/50/60 CR5MSY20/25/30 BR20F6HEAT EXCHANGER OVERHEAT√x21H0COMPRESSOR SENSOR SYSTEM ABNORMAL22H3HIGH PRESSURE SWITCH ERROR23H6POSITION SENSOR ABNORMAL ( compressor )24H8AC CURRENT SENSOR ERROR25H9OUTDOOR AIR THERMISTOR SHORT/OPEN26J1PRESSURE SENSOR ERROR27J3COMPRESSOR DISCHARGE PIPE THERMISTOR SHORT/OPEN/MISPLACED28J5SUCTION PIPE THERMISTOR SHORT/ OPENX29J6OUTDOOR HEAT EXCHANGER THERMISTOR SHORT/ OPEN
15 ERROR INDICATION Error code description for Y-series inverter : No. ERROR DESCRIPTION5LCY10/15 DR20/25 CR5LCY 10/15 ER5LCY 30/40/50/60 CR5MSY20/25/30 BR30J7SUBCOOLING HEAT EXCHANGER THERMISTOR SHORT/ OPENx√31J8LIQUID PIPE THERMISTOR SHORT/ OPEN32J9GAS PIPE THERMISTOR SHORT/ OPEN33L1OUTDOOR PCB ERROR34L3ELECTRICAL BOX TEMPERATURE RISE( compressor off )35L4HEAT SINK OVERHEAT ( compressor on )36L5IPM ERROR / IGBT ERROR ( output over current )37L8ELECTRONIC THERMAL ( time lag-compressor signal disorder position)
16 ERROR INDICATION Error code description for Y-series inverter : No. ERROR DESCRIPTION5LCY10/15 DR 20/25 CR5LCY 10/15 ER5LCY 30/40/50/60 CR5MSY20/25/30 BR38P1OPEN PHASE OR VOLTAGE UNBALANCEx√39P4HEAT SINK THERMISTOR SHORT / OPEN40U0INSUFFICIENT GAS41U2DC VOLTAGE OUT OF RANGE42U4COMMUNICATION ERROR43UAINSTALLATION ERROR44UHANTIFREEZE PROTECTION IN OTHER ROOM
17 ERROR INDICATION 1) 5LCY-10/15DR, 20/25CR : 7 segment display From outdoor unit :When unit error happen, the error will show at outdoor display .1) 5LCY-10/15DR, 20/25CR : 7 segment display2) 5MSY-20/25/30BR : 5 LED light indicator3) 5LCY-30/40/50/60ER : 2 LED light indicator4) 5LCY-10/15ER : Nil
18 ERROR INDICATION 1. 5LCY-10/15 DR, 20/25CR: 7 segment display 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 forslx10,25Overall photo forcontrol box slx10,25
19 ERROR INDICATIONWhen there is no error, compressor running frequency is displayed.When there is error, it flashes the error code as below:Normal operationFlashing error code
20 ERROR INDICATIONIn addition, 7 segment also can be use to retrieve unit operating condition such as running current, DC voltage, ambient temperature, indoor air temperature , etc.By pressing the tact switch, the 7 segment will start to flash from “00”. Press again, it will show “ 01”and subsequent running number showsthe parameter number.Then, the 7 segment will flashing againshowing the parameter measurement.When the 7 segment display is left untouchedfor 5 min, the display will light off (Dim).
21 ERROR INDICATIONFor measurement of 125, the 7 segment will display as 25 first follow by 01
22 ERROR INDICATION2. 5MSY-20/25/30BR: 5 LED display at display boardLED A – flashing GREEN LED indicates normal equipment condition.LED – OFF condition of the red LED indicates normal equipmentcondition.LED blinking indicates error.
24 ERROR INDICATION3. 5LCY-30/40/50/60ER: 2 LED light indicatorLED HAP – flashing GREEN LED indicates normal condition.LED HAP – OFF condition indicates power supply abnormal or faultyoutdoor PCBLED H3P – OFF condition of the red LED indicates normal condition.LED H3P – ON condition indicates protection devices activate
25 OTHERS 5LCY30/40/50/60 display PCB guide : 5LCY30 ER 5LCY 40/50/60 ER
26 ERROR INDICATION4. 5LCY-10/15ER: NilFor K-series inverter, the outdoor will not have error indicator, have to refer to indoor when error happen.
28 ERROR DIAGNOSIS ERROR A 1 : Indoor PCB error Troubleshooting flow : Error message : A1Method of malfunction detection : Evaluation of zero- cross detection of power supply by indoor unitMalfunction decision condition : When there is no zero-cross detection in 10 seconds continuously.causes : 1.) Faulty indoor PCB2.) Faulty connector connection at indoorTroubleshooting flow :Turn off unitCheck indoor PCB connector conditions( including PCB to terminal block and all PCB wire connector)YESAny sign of loose or abnormalConnect correctly and operate againNOReplace indoor PCB and operate again
29 ERROR DIAGNOSISERROR A 3 : Drain pump abnormal (for ceiling cassette unit)Error message : A3Method of malfunction detection : Evaluation of water level upper limit and float switch conditionMalfunction decision condition : When water level reach upper limit and float switch turn offcauses : 1.) Faulty drain pump or float switch2.) Improper drain piping work or drain pipe blockageTroubleshooting flow :Turn off unitCheck drain pump connector connectto indoor PCBYESAny sign of loose or abnormalConnect correctly and operate againNORestart back operation
30 ERROR DIAGNOSISERROR A 3 : Drain pump abnormal (for ceiling cassette unit)NODrain pump works ?Change drain pumpYESDrain water level abnormal highafter sometimes ?Float switch connect tothe PCB?NONOConnect float switchYESYESDrainage system problem or blockageCheck float switch havecontinuity?NOChange float switchYESChange indoor PCB
31 ERROR DIAGNOSIS ERROR A 5 : Antifreeze Protection Error message : A5 Method of malfunction detection : Freeze-up protection control during cooling by detection of indoor heat exchanger thermistor.Malfunction decision condition : When indoor heat exchanger thermistor less than 0 ◦ C .causes : 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 flowYESAny air short circuit ?Provide sufficient air passageNOCheck intake air filter
32 ERROR DIAGNOSIS ERROR A 5 : Antifreeze Protection YES Is it very dirty ?Clean the air filterNOCheck the dust accumulate at indoor coilYESIs it very dirty ?Clean the indoor coilCheck indoor coil thermistor resistance# Refer to thermistor resistance tableDoes it conform to the thermistoraccuracy table?YESChange indoor PCBNOChange indoor coil thermistor
33 ERROR DIAGNOSIS ERROR A 6 : Indoor fan motor abnormal Error message : A6Method of malfunction detection : Rotation speed detected by the indoor PCB during fan motor running is used to determine this error.Malfunction decision condition : When the detected motor rotation speed does not reach the target rotation speed by the programcauses : 1.) Indoor fan motor winding short, or the motor lead wire broken2.)Indoor PCB faulty.Troubleshooting flow :
34 Turn off power supply and rotate fan by hand ERROR DIAGNOSISERROR A 6 : Indoor fan motor abnormalTurn off power supply and rotate fan by handNODoes it rotate ?Change fan motorYESTurn ON and run fanNODoes it rotate ?Change fan motorYESChange PCB
35 OTHERS : Inverter–Y series fan motor: 5LCY 10/15 DR 5LCY 20/25 CR 5LCY 10/15 ER5MSY 20/25/30 BR5LCY 30/40/50/60 EROutdoorACDCIndoorWM------CC,CK, CM
36 ERROR DIAGNOSIS ERROR A 8 : Abnormal power supply voltage Error message : A8Method of malfunction detection : Checking of input voltageMalfunction decision condition : When the voltage detected out of range of ± 10 % of 240 V.causes : 1.) Power supply problem or blackout.2.) Wiring problem or Indoor PCB faulty.Troubleshooting flow :Check the condition of power source :1.) voltage is 220V-240V± 10%2.) Check there is power open phase or wiring problem3.) Check power supplier fluctuation within 6VAny problem as describe above?YESCorrect the supply problemNOPossible of external factor such as blackout
37 ERROR DIAGNOSIS ERROR C4, C9 : INDOOR HEAT EXCHANGER , ROOM THERMISTOR SHORT/OPENError message : C4, C9Method of malfunction detection : Temperature detected by the thermistorMalfunction decision condition : When the thermistor input is > 4.96V or <0.04V during compressor operation.causes : 1.) Thermistor , connector faulty.2.) Indoor PCB faulty.Troubleshooting flow :Check the thermistor connector conditionNoNormal ?Correct the problemYesCheck thermistor resistance value# Refer thermistor resistance tableNoNormal ?Replace thermistorReplace PCB
38 ERROR DIAGNOSIS ERROR C4, C9 Indoor heat exchanger thermistor ( 5WMY10/15 JR ) Location of indoor coil thermistor:CN COIL
39 Air intake gap for room temperature sensing ERROR DIAGNOSISERROR C4, C9Indoor room thermistorFor room thermistor : WMY-J series, K-series = Chips type thermistor mount to the PCB.other indoor - copper sensor attached to return air locationAir intake gap for room temperature sensingRTH201Unit design with air opening at the front panel to allowsufficient space for air flow & measurement
40 ERROR DIAGNOSISERROR E3 : High pressure protection (for 5LCY ER)Error message : E3Method of malfunction detection : Protection device check high pressure switch continuityMalfunction decision condition : When the high pressure switch is turn off at 4MPa. ( 580 psi ) , turn on at 3 MPa ( 435 psi )causes : 1.) faulty high pressure switch , connector or wire harness2.) Indoor filter , outdoor coil dirty.3.) Outdoor fan not running, unit overcharge, stop valve is closed.Troubleshooting flow :Check the installation conditionNoStop valve open?Open the stop valveYesHigh pressure switch connectto outdoor PCB?NoConnect correctlyTurn off unit. Wait for compressor stop 10 minutes
41 ERROR DIAGNOSIS ERROR E3 : High pressure protection (for 5LCY30-60 ER) Have continuity for highpressure switch?NoReplace high pressure switchYesCheck the abnormal unit highpressure condition# Refer how to check high pressure conditionHave abnormal condition?YesCorrect the abnormal conditionNoReplace outdoor PCB
43 ERROR DIAGNOSIS Installation condition : 5LCY10/15 DR Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflowFollow this installation guidelines to avoid air short circuit
44 ERROR DIAGNOSIS ERROR E4 : Low pressure protection (for 5LCY30-60 ER) Error message : E4Method of malfunction detection : Protection device check low pressure switch continuityMalfunction decision condition : When the pressure detected is < 0.12 MPa ( 17 psi )for continues 5 minutes.causes : 1.) faulty low pressure switch , faulty outdoor PCB2.) Stop valve closed, unit leakage or refrigerant not enough.3.) Abnormal refrigerant piping system ,faulty EXVTroubleshooting flow :Stop valve open?NoOpen the stop valveYesLow pressure switch connectto outdoor PCB?NoConnect correctlyYesMeasure the voltage between low pressure switch# Refer how to check low pressure voltage
45 ERROR DIAGNOSIS ERROR E4 : Low pressure protection (for 5LCY30-60 ER) Relation between Voltage andpressure follow the graph?NoChange the low pressure switchYesNoIs the refrigerant pressureabnormally low?Change the Outdoor PCBYesCorrect refrigerant system( gas shortage, leakage or piping block )# Refer how to check low pressure condition
47 Outdoor pressure sensor condition check : For 5LCY30-60 ER pressure switch:PH = detected pressure ( MPa )V = Output Dc voltagePH = 1.38 V -0.69
48 ERROR DIAGNOSIS ERROR E5 : Compressor overload Error message : E5 Method of malfunction detection : Detected by compressor overloadMalfunction decision condition : When compressor overload activate twice. If active once, will be reset if not happen in following 60 mins.causes : 1.) Stop valve , EXV defective2.) 4wv , outdoor PCB defective3.) Refrigerant shortage, water mixed in the pipingTroubleshooting flow :Turn off unit. DisconnectCompressor wire hardness( U,V,W )Check compressor winding resistance# Refer compressor resistance tableResistance normal?NoChange compressorYes
49 ERROR DIAGNOSIS ERROR E5 : Compressor overload Connect back wire and turn on unitCompressor stop without running?YesChange outdoor PCBNoCompressor run for sometimes.Check EXV, stop valve, refrigerant level, 4WV andwater in the piping, installation condition
50 ERROR DIAGNOSIS Inverter –Y series Compressor spec: 5LCY 10/15 DR5LCY 20/25 CR5LCY 10/15 ER5MSY 20 BR5MSY25/30 BR5LCY 30 ER5LCY 40/50/60 ERCompressor typeRotary(swing)rotaryscrollCompressor manufacturerPanasonicDaikinCompressor model5RS102XBJ012YC32GXD1YC23AEXDA2YC36BXD2YC45BXD2YC63DXDJT-100G-VDCompressor winding resistance( U,V,W ) -Ω0.8581.181.7640.8280.7870.31motor6 pole brushless motor4 pole brushless motorGeneral guide :1) Resistance of compressor winding < 10 Ω consider Ok2) All 3 terminal resistance value must be same.
51 Other : Inverter –Y series Compressor spec : 6 poles motor
52 ERROR DIAGNOSIS ERROR F3 : Discharge pipe overheat Error message : F3 Method of malfunction detection : Compressor discharge thermistor is checked with discharge temperature control.Malfunction decision condition : When compressor discharge temperature is at abnormal high level or rise suddenly.E.g. : degree C varies by model degree C when compressor frequency low.causes : Faulty discharge thermistor, compressor, Outdoor PCB2. Refrigerant shortageTroubleshooting flow :Check discharge thermistor conditionAny wire damage,not insert to connector?YesCorrect wiringNoCheck discharge thermistor resistance value# Refer resistance table : for discharge thermistor, different spec.
54 ERROR DIAGNOSIS ERROR F6 : Heat exchanger overheat Error message : F6 Method of malfunction detection : Detect heat exchanger ( outdoor coil ) temperature during cooling mode .Malfunction decision condition : Activate when outdoor coil temperature exceed 65 º C. Error reset when temperature drop to 50º C.causes : 1.) Faulty outdoor coil thermistor, faulty outdoor PCB2.) Installation space not enough, hot air short circuit, fan motor not running , coil dirtyTroubleshooting flow :Check outdoor installation conditionAny abnormal?YesChange outdoor location,clean outdoor coil.NoCheck outdoor fan motor
55 ERROR DIAGNOSIS ERROR F6 : Heat exchanger overheat No Fan motor running smoothly?NoChange fan motorYesCheck outdoor coil thermistor resistance# Refer resistance tableResistance normal?NoChange thermistorYesChange outdoor PCB
56 ERROR DIAGNOSIS ERROR H0 : Compressor sensor system abnormal Error message : F6Method of malfunction detection : Detect the compressor current and voltage before compressor start.Malfunction decision condition : Detected DC voltage is too low or too high. No current detected when compressor startcauses : 1.) Outdoor PCB, compressor problem2.) Compressor wrong wiring, reactor not connected.Troubleshooting flow :Check reactor connectionAny abnormal?YesConnect back reactorNoCheck reactor resistance
57 ERROR DIAGNOSIS ERROR H0 : Compressor sensor system abnormal Check reactor resistance# disconnect the reactor wire and measure resistance between terminalNo<10 Ω ?Change reactorYesCheck compressor resistance<10 Ω ?NoChange compressorYesChange outdoor PCB
58 ERROR DIAGNOSISERROR H9, J3,J5,J6,J7,J8,J9,P4 : Outdoor Thermistor related abnormalError message : H9,J3,J5,J6,J7,J8,J9,P4Method of malfunction detection : Detect the temperature detected by the thermistor.Malfunction decision condition : When thermistor is disconnected or short circuit during operation.J3 is judged when compressor discharge thermistor temperature is smaller compare to the condenserthermistor temperature.causes : 1.) Thermistor, connector problem2.) Outdoor PCB problemTroubleshooting flow :Check connector for the thermistor with errorYesThermistor disconnected or loose?Connect thermistor backNoCheck thermistor resistance# Refer thermistor spec and the table.
61 How to check thermistor resistance Use multi meter to check the thermistor resistance value.
62 Inverter–Y series Thermistor spec : (10 KΩ) At 25CResistance value: 10 k
63 Inverter–Y series Thermistor spec : (20 KΩ) At 25CResistance value: 20 k
64 Inverter–Y series Thermistor spec : (discharge thermistor) Discharge thermistor spec for 5LCY 30/40/50/60
65 ERROR DIAGNOSIS For Outdoor 5LCY10/15 DR : Outdoor air thermistor with PVC protection sleeveAll thermistor ( discharge, air, coil ) share a same connector and connect to PCBOutdoor discharge , heat exchangerThermistor : copper type
66 ERROR DIAGNOSISERROR L3 : Electrical Box temperature rise (compressor off)Error message : L3Method of malfunction detection : Detect the temperature of heat sink when compressor off.Malfunction decision condition : Heat sink temperature >80 º C( MSY ), > 93 º C ( K-series ) when compressor off. Error reset whentemperature drop < 70 º C.causes : 1.) Outdoor fan , PCB problem2.) Heat sink thermistor, connector problem
67 ERROR DIAGNOSISERROR L3 : Electrical Box temperature rise (compressor off)Troubleshooting flow :Turn off the unit and turn on back after 20 minsNoError again ?Check outdoor fan# Refer thermistor spec and the table.YesNoCheck heat sink thermistor resistanceOutdoor fan functioning?Change outdoorfan motorYesNoNoHeat sink dirty?Check installationconditionChange thermistorResistance normal?YesYesNoHeat sink temperature> 80 ºC ?Clean the heat sinkChange outdoor PCBChange heat sink or check outdoor fan condition
68 ERROR DIAGNOSIS ERROR L4 : Heat sink overheat (compressor on) Error message : L4Method of malfunction detection : Detect the temperature of heat sink when compressor on.Malfunction decision condition : Heat sink temperature >103º C( MSY ), > 93 º C ( K-series ) when compressor on. Error clear whennot happen in the following 60 mins.causes : 1.) Outdoor fan , PCB problem2.) Heat sink thermistor, connector problem
69 ERROR DIAGNOSIS ERROR L4 : Heat sink overheat (compressor on) Troubleshooting flow :Turn off the unit and turn on back after 20 minsNoError again ?Check outdoor fan# Refer thermistor spec and the table.YesNoOutdoor fan functioning?Change outdoorfan motorCheck heat sink thermistor resistanceYesNoHeat sink dirty?Check installationconditionChange thermistorNoResistance normal?YesYesNoHeat sink temperature> 93 ºC ?Clean the heat sinkChange outdoorPCBYesChange heat sink or check outdoor fan condition# Make sure condition of silicon grease apply to IPM , and diode bridge is good.
70 Application of silicon grease to IPM board and diode bridge :
71 ERROR DIAGNOSIS Bad condition of silicon grease can cause L4 ( heat sink overheat )L5 ( IPM error )Heat sinkSilicon greaseIPM board
72 ERROR DIAGNOSISFor Outdoor 5LCY10/15 DR : The heat sink thermistor is screw and connectthe PCB ( port : CN HTSK )
73 Turn off the unit and turn on back after 20 mins ERROR DIAGNOSISERROR L5 : IPM (inverter power module) / IGBT error(output over current)Error message : L5Method of malfunction detection : Detect the output current that flows into IPM board inverter DC section.Malfunction decision condition : 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 problem2.) 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.NoStop valve fully open?Open stop valveYesTurn off the unit and turn on back after 20 minsContinue monitor for supply voltage, discharge,suction pressure, compressor overload,Check for silicon grease at IPM conditionError again ?NoYes
74 ERROR DIAGNOSIS ERROR L5 : IPM / IGBT error (output over current) Turn off the unit and disconnectcompressor U,V,W wireCheck compressor winding resistanceResistance normalNoChange compressorYesChange the Outdoor PCB
75 ERROR DIAGNOSIS ERROR U0 : Insufficient gas Error message : L5 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 EXVopening is high( >450 pulse )causes : 1.) Refrigerant shortage, unit leakage2.)Refrigerant piping system block,3.) EXV defective, thermistor disconnected, stop valve closed
76 ERROR DIAGNOSIS ERROR U0 : Insufficient gas Yes Any thermistor disconnected?YesConnect backNoStop valve closed?YesOpen stop valveNoCheck for EXV functionEXV functioning?NoChange EXVYesCheck for refrigerant level# How to check refrigerant level
77 ERROR DIAGNOSIS ERROR U0 : Insufficient gas Refrigerant level normal? Check for leakageYesChange thermistor, outdoor PCB or compressorAny leakage?YesRepair the leak pointNoAdd refrigerant
78 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 suctionpressure.- Ideal suction pressure level : psi(depends on the outdoor ambient temperature).
79 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
80 ERROR DIAGNOSISERROR U4 : Communication error (between indoor and outdoor)Error message : U4Method of malfunction detection : Data received from the outdoor unit in indoor unit -outdoor unit signal transmission is checked whether it isnormal.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 PCB2.)Indoor-outdoor signal wire line wiring error ( loose or broken ).3.) External noise, power supply waveform disturbanceCheck indoor-outdoor wiring connection#Refer wiring checkAny wiring problem?YesCorrect the wiringNoCheck outdoor unit PCB “ status LED “
81 ERROR DIAGNOSISERROR U4 : Communication error (between indoor and outdoor)NoLED light on?Change outdoor PCBYesCheck voltage of indoor-outdoor connection between No.1-No.3 and No.2-No.3Voltage =0?YesReplace connection between indoor and outdoorNoCheck power supply waveform#Refer supply waveform checkAny disturbance?YesFind the source of power disturbance and correct itNoReplace indoor unit PCB ,external noise ( interference )
82 Wiring – How to check communication wire : Maximum communication wire length: 50 metersMake sure the recommended type of wire is usedCheck for loose connection
83 Power supply disturbance check Using power analyzer to check the supply voltage
84 ERROR DIAGNOSIS ERROR UA : Installation error Error message : UAMethod 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 disturbanceX-series inverter unit can not couple with Y-series inverterK-series inverter unit can not couple with X, Y series inverter and only available in 1.0 ,1.5 Hose power.
85 ERROR DIAGNOSIS ERROR UA : Installation error 5WMY10/15 JR 5LCY10/15 DR