MITSUBISHI CITY MULTI FAULT CODE

FAULT CODE =  403
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Comms fault between boards - check inverter error detail for which 2 boards, check transformer, bus voltage and inter-connecting cables

FAULT CODE = 900
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = Lossnay unit in test run

FAULT CODE = 1102
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = High compressor discharge temperature. Discharge temperature has exceeded 110°C or more. Short of refrigerant. Discharge thermistor

FAULT CODE = 1111
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Low pressure/temperature fault - check thermistors (TH2, TH3, TH4), gas charge, indoor fan, heat exchanger and filter

FAULT CODE = 1112
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Low pressure/temperature fault - check thermistors (TH2, TH3, TH4), gas charge, indoor fan, heat exchanger and filter

FAULT CODE = 1113
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Low pressure/temperature fault - check thermistors (TH2, TH3, TH4), gas charge, indoor fan, heat exchanger and filter

FAULT CODE = 1202
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Preliminary fault to 1102

FAULT CODE = 1204
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Preliminary heat exchanger gas temperature sensor fault - check thermistors 10a and 10b

FAULT CODE = 1205
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Preliminary thermistor fault (TH5)

FAULT CODE = 1211
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Preliminary thermistor fault (TH2)

FAULT CODE =  1214
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Preliminary thermistor fault (THHS)

FAULT CODE = 1216
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Preliminary thermistor fault (TH7)

FAULT CODE = 1217
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Preliminary thermistor fault (TH8)

FAULT CODE = 1219
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Preliminary thermistor fault (TH9)

FAULT CODE = 1221
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Preliminary thermistor fault (TH6)

FAULT CODE = 1243
R22 = -
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Preliminary thermistor fault (TH10)

FAULT CODE = 1301
R22 = -
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Low pressure fault (63L operation) low pressure sensor sensing less than 1 bar immediately before starting

FAULT CODE = 1302
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = High pressure fault - check pressure in system for more than 29 bar (R407c) 38 bar (R410A). Check high pressure sensor against gauge pressure

FAULT CODE = 1368
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Pressure sensor fault (PS1) at BC - compare pressure reading on SW1 on O/C

FAULT CODE = 1370
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Pressure sensor fault (PS3) at BC - compare pressure reading on SW1 at O/C

FAULT CODE = 1402
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Preliminary fault to 1302

FAULT CODE = 1500
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = System overcharge. Abnormal low compressor superheat - discharge thermistor TH4

FAULT CODE = 1501
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = High compressor shell temp - check for shortage of gas, insufficient indoor index running (comms room units)

FAULT CODE = 1505
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Suction pressure abnormal - generated by low pressure sensor detecting a vacuum - check for blockage, closed valve or sensor fault

FAULT CODE = 2500
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Detecting lack of water flow on a water circuit

FAULT CODE = 2502
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = I/C has water level in drip tray, when the unit was running in cooling (temperature sensors - check for open or closed circuit and operation of pump)

FAULT CODE = 2503
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = I/C has water level in drip tray when the unit was running in cooling (float sensor - check for closed circuit on float switch and operation of pump)

FAULT CODE = 2600
R22 = x
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Water leak from humidifier

FAULT CODE = 4100
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = Compressor over current protection on Mr Slim with M-net interface - check inverter or compressor

FAULT CODE = 4101
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = Compressor over current protection on Mr Slim with M-net interface - check inverter or compressor

FAULT CODE = 4102
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Open phase fault - check power supply and noise filter for loss of phase, check wiring and fuses

FAULT CODE = 4103
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Reverse phase fault - check phase rotation, loss of phase through the noise filter, fuse blown and high pressure switch open at power on

FAULT CODE = 4106
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Transmission power supply fault - check wiring, high current, incorrect voltage on transmission line and/or M-Net board

FAULT CODE = 4108
R22 = -
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = Over current protection on DOL compressor - check power supply, contactor and compressor

FAULT CODE = 4115
R22 = x
R407c = x        
R410A = x                                                              
LOSSNAY = -
DESCRIPTION = Power supply abnormal - check power, fuses, connections and PCB

FAULT CODE = 4116
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Fan motor abnormal - check fan motor and board (relates to indoor unit or Lossnay unit)

FAULT CODE = 4124
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = Thermal switch (49C) open circuit on Mr Slim on M-Net - reset and check pressures and air flow

FAULT CODE = 4210
R22 = x
R407c  = -
R410A = -
LOSSNAY = -
DESCRIPTION = Compressor over current problem - check inverter balance. Compressor and inverter

FAULT CODE = 4220
R22 = -
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Low inverter board BUS voltage. Less than 289VdcDC is detected. - check mains supply

FAULT CODE = 4225
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Low DC voltage on Vdc on fan inverter - check CNVdc for 300Vdc on diode stack and check mains power supply to outdoor unit

FAULT CODE = 4230
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = High temperature on heat sink on inverter - check for blockages in air duct, failure of INV fan or failure of thermistor

FAULT CODE = 4235
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Fan inverter heat sink overheat protection. Reduced airflow through heat sink. Fan motor problem. THHS thermistor problem.

FAULT CODE = 4240
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Over current protection. If high current is detected for more than 10 minutes - check inverter balance. Reduced airflow through heat sink

FAULT CODE = 4245
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Over current protection. Possible ACCT current sensor fault. Should read 280 ohms between pins 1 & 2 and across pins 3 & 4

FAULT CODE = 4250
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Over current protection. Inverter IPM problem. Compressor lock - check inverter balance

FAULT CODE = 4255
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Inverter cooling fan problem - if high static fan is used then check that SW3-9 is on

FAULT CODE = 4260
R22 = -
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Preliminary inverter heat sink overheat protection. Reduced airflow through heat sink. Fan motor problem. THHS thermistor problem.

FAULT CODE = 5101
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Thermistor fault at indoor/outdoor unit - check fault code address

FAULT CODE = 5102
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Thermistor fault at indoor/outdoor unit - check fault code address

FAULT CODE = 5103
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Thermistor fault at indoor/outdoor unit - check fault code address

FAULT CODE = 5104
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Thermistor fault at indoor/outdoor unit - check fault code address (indoor fault - check SW7-3 is off)

FAULT CODE = 5105
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = TH5 open/short circuit - check if the TH is disconnected from the board

FAULT CODE = 5106
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = TH5 open/short circuit - check if the TH is disconnected from the board

FAULT CODE = 5107
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = TH7 open/short circuit - check if the TH is disconnected from the board

FAULT CODE = 5108
R22 = x
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = TH8 open/short circuit - check if the TH is disconnected from the board

FAULT CODE = 5109
R22 = -
R407c = x
R410A = -
LOSSNAY = -
DESCRIPTION = TH9 open/short circuit - check if the TH is disconnected from the board

FAULT CODE = 5110
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = TH10 open/short circuit - check if the TH is disconnected from the board

FAULT CODE = 5111
R22 = x
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = BC box thermistor error - TH11 open/short circuit, disconnected from board/pipe

FAULT CODE = 5112
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = BC box thermistor error - TH10 open/short circuit, disconnected from board/pipe

FAULT CODE = 5113
R22 = x
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = BC box thermistor error - TH open/short circuit, disconnected from board/pipe

FAULT CODE = 5114
R22 = x
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = BC box thermistor error - TH open/short circuit, disconnected from board/pipe

FAULT CODE = 5115
R22 = x
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = BC box thermistor error - TH15 open/short circuit, disconnected from board/pipe

FAULT CODE = 5116
R22 = x
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = BC box thermistor error - TH16 open/short circuit, disconnected from board/pipe

FAULT CODE = 5201
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Pressure sensor fault outdoor unit/BC box - check fault code address/SW1 pressure sensor readings

FAULT CODE = 5202
R22 = x
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = Pressure sensor fault (PS2) in the BC box

FAULT CODE = 5203
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Pressure sensor fault (PS3) in the BC box

FAULT CODE = 5300
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = A-Control UH fault - see Mr Slim fault code list

FAULT CODE = 5301
R22 = -
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Current sensor fault, ACCT or DCCT - check inv. error details

FAULT CODE = 5401
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Temperature sensor fault - check CN30 for humidity sensor

FAULT CODE = 5701
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Loose float switch connector - check switch, check CN4F on indoor unit

FAULT CODE = 6201
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = TB7 transmission line communication error - check for voltage abnormality/short

FAULT CODE = 6202
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Transmission processor hardware error - check for noise/short on M-Net cable

FAULT CODE = 6600
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Repeat address fault - two or more units are assigned the same address - correct the repeated address

FAULT CODE = 6601
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Polarity setting error - no voltage or short circuit on the m-net transmission line

FAULT CODE = 6602
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Hardware error of transmission processor. Noise interference. Polarity problem on TB7

FAULT CODE =
R22 =
R407c
R410A =
LOSSNAY = -
DESCRIPTION =

FAULT CODE = 6603
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Bus circuit busy - check if indoor unit, Lossnay unit or anything else has been wired into TB7, instead of TB3

FAULT CODE = 6607
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Communication issue - no response back from unit whilst system is operational

FAULT CODE = 6608
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Communication error - loss of voltage or noise entering the transmission line

FAULT CODE = 6700
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K control communication error - R22 type unit connected onto M-Net circuit comms error

FAULT CODE = 6701
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K control communication error - R22 type unit connected onto M-Net circuit comms error

FAULT CODE = 6702
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K control duplicate address error - two or more R22 type units connected onto M-Net circuit with the same address

FAULT CODE = 6750
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K control communication error - R22 type unit connected onto M-Net circuit comms error

FAULT CODE = 6751
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 R/A thermistor fault (P1)

FAULT CODE = 6752
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 frost protection at I/C (P6)

FAULT CODE = 6753
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = Comms fault between O/C and I/C

FAULT CODE = 6754
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 drain fault (P5)

FAULT CODE = 6755
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 drain fault (P5)

FAULT CODE = 6756
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 frost protection at I/C (P6)

FAULT CODE = 6757
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = System error

FAULT CODE = 6758
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = Comms fault between I/C and O/C

FAULT CODE = 6761
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 R/A thermistor fault (P1)

FAULT CODE = 6762
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 TH2 fault check resistance (P2)

FAULT CODE = 6763
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 Comms fault between I/C and O/C

FAULT CODE = 6764
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 drain fault (P4)

FAULT CODE = 6765
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 drain fault (P5)

FAULT CODE = 6766
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 frost protection at I/C (P6)

FAULT CODE = 6767
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = R22 comms fault between I/C and O/C

FAULT CODE = 6771
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K abnormality - high pressure abnormality or low pressure abnormality

FAULT CODE = 6772
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K abnormality - inner thermostat function, discharge temperature abnormality, shell thermostat function, over current protection

FAULT CODE = 6773
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K abnormality - radiator plate thermostat function

FAULT CODE = 6774
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K abnormality - outdoor thermistor abnormality

FAULT CODE = 6775
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K abnormality - pressure sensor abnormality, indoor/outdoor communication error

FAULT CODE = 6776
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K abnormality - over current shut-off

FAULT CODE = 6777
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K abnormality - system error

FAULT CODE = 6778
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K abnormality - normal

FAULT CODE = 6779
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = K abnormality - refrigerant overcharge, abnormal voltage, abnormal CT sensor

FAULT CODE = 6830
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = Comms fault between I/C and R/C check connections to MA R/C and check for 12Vdc check R/C not set sub controller

FAULT CODE = 6831
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = MA R/C communication fault - check connections on TB15 or that the controller was removed while the I/C was powered

FAULT CODE = 6832
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = MA controller comms fault - check cable length no bigger than 500m, check connection and type of cable used, check R/C not set sub on field settings

FAULT CODE = 6833
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = MA controller comms fault check cable length no bigger than 500m, check connection and type of cable used, check R/C not set sub on field settings

FAULT CODE = 6834
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = MA Controller comms fault - check cable length no bigger than 500m, check connection and type of cable used, check R/C not set sub on field settings

FAULT CODE = 6840
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = A-Control E6/E8 fault - see Mr Slim fault code list

FAULT CODE = 6841
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = A-Control E7/E9 fault - see Mr Slim fault code list

FAULT CODE = 6844
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = A-Control EA fault - see Mr Slim fault code list

FAULT CODE = 6845
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = A-Control Eb fault - see Mr Slim fault code list

FAULT CODE = 6846
R22 = -
R407c = -
R410A = -
LOSSNAY = -
DESCRIPTION = A-Control EC fault - see Mr Slim fault code list

FAULT CODE = 7100
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Over capacity - (R2 150% index exceeded) (Y 130% index exceeded)

FAULT CODE = 7101
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Capacity setting error - SW2 set wrong on indoors, SW5 on YHMA outdoor, (SW3-10 on older kit)

FAULT CODE = 7102
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Error in number of connected units - loss of M-Net voltage (short or break), no power to BC, wrong SW5 setting on box, wrong box type

FAULT CODE = 7105
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Address setting error - OC or BC addressed wrong

FAULT CODE = 7106
R22 = -
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Attribute setting error - SW3-1 setting on a GUF

FAULT CODE = 7107
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Port setting error - check if too much capacity on a single port, wiring SW2 setting, wrong SW14 setting or wrong units on a box when using multiple boxes

FAULT CODE = 7110
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Check SW5-7 is correctly set

FAULT CODE = 7111
R22 = x
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Remote control sensor fault - SW1 - 1 on and no controllers fitted or faulty remote controller

FAULT CODE = 7113
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Function setting error - wrong SW5 setting or wrong resistors fitted on YHM-A

FAULT CODE = 7117
R22 = -
R407c = -
R410A = x
LOSSNAY = -
DESCRIPTION = Model setting error - SW5 set wrong or wrong resistors in

FAULT CODE = 7130
R22 = -
R407c = x
R410A = x
LOSSNAY = -
DESCRIPTION = Incompatible equipment on M-Net - check split with MAC 399 wired onto the TB5 line TB5 line, not the TB7

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MITSUBISHI INVERTER MULTI-SPLIT SYSTEM SCM80ZA ERROR CODE

(OUTDOOR UNIT) 

SCM80ZA 

(INDOOR UNIT) 

SKM22ZA SRRM40ZA 

SKM25ZA 

SKM28ZA 

SKM32ZA 

SKM40ZA 

SKM50ZA

Indoor unit indicator

RUN lamp = 1 time flash 

TIMER lamp =  Comes on

Outdoor unit indicator (LED5) = Stays off 

Description of trouble = Indoor heat exchanger thermistor error

Cause = Broken heat exchanger thermistor wire, Connector poor connection

Conditions of flashing = When heat exchanger thermistor temperature of –20 °C or under continued for more than 3   seconds   while   operation   is   stopped. (This is not displayed during operation.) 

Indoor unit indicator

RUN lamp = 2 time flash

TIMER lamp =  Comes on

Outdoor unit indicator (LED5) = Stays off 

Description of trouble = Room temperature thermistor error

Cause = Broken room temperature thermistor wire, Connector poor connection

Conditions of flashing = When room temperature thermistor temperature of –20 °C or under continued for more than 3   seconds while operation is stopped. (This is not displayed during operation.) 

Indoor unit indicator

RUN lamp = 5 time flash

TIMER lamp =  Comes on

Outdoor unit indicator (LED5) = Stays off 

Description of trouble = Drain abnormality (1) 

Cause = Drain at reverse gradient, Float switch defective 

Conditions of flashing = Float switch motion 

Indoor unit indicator

RUN lamp = 6 time flash

TIMER lamp =  Comes on

Outdoor unit indicator (LED5) = Stays off 

Description of trouble = Indoor fan motor error (2)

Cause = Defective fan motor, Connector poor connection 

Conditions of flashing = When air conditioner is operating and indoor fan motor is turned ON, indoor fan motor speed of 400  rpm or under continued for more  than 30 seconds.  (Air   conditioner stops.)

Indoor unit indicator

RUN lamp = Keeps flashing 

TIMER lamp =  1 time flash

Outdoor unit indicator (LED5) = Stays off 

Description of trouble = Outdoor temperature thermistor error

Cause = Broken outdoor thermistor wire, Poor connector connection

Conditions of flashing = When outdoor temperature sensor temperature of –40 °C or under continued for more than 3 seconds   while opeation is stopped. (This is not displayed during operation.) 

Indoor unit indicator

RUN lamp = Keeps flashing

TIMER lamp = 2 time flash

Outdoor unit indicator (LED5) = Stays off

Description of trouble = Outdoor heat exchanger gas pipe thermistor error

Cause = Broken heat exchanger gas pipe termistor wire, Poor connector connection 

Conditions of flashing = When heat exchanger entrance thermistor  temperature of  –50 °C or under continued for more than   3 seconds while operation is stopped. (This is not displayed during operation.)

Indoor unit indicator

RUN lamp = Comes on 

TIMER lamp = 1 time flash

Outdoor unit indicator (LED5) = 1 time flash

Description of trouble = Current cut

Cause = Compressor locking, Open phase on compressor output, Short circuit on power transformer

Conditions of flashing = When converter output current which exceeds setting value is detected. (Compressor stops.)

Indoor unit indicator

RUN lamp = Comes on

TIMER lamp = 2 time flash

Outdoor unit indicator (LED5) = 2 time flash

Description of trouble = Trouble of outdoor unit

Cause = Broken power transformer, Broken compressor wire, Compressor blockage

Conditions of flashing = When the input current of 1 A or less is detected for 30 continuous seconds or more. (Compressor stops.) 

Indoor unit indicator

RUN lamp = Comes on

TIMER lamp = 2 time flash

Outdoor unit indicator (LED5) = On for 4 seconds and off for 4 seconds

Description of trouble = Discharge pipe thermistor error

Cause = Broken discharge pipe thermistor wire, Connector poor connection 

Conditions of flashing = When the discharge pipe thermistor temperature measures an interrupted signal (less than 7 °C) of 10 seconds or more.

Indoor unit indicator

RUN lamp = Comes on

TIMER lamp = 3 time flash

Outdoor unit indicator (LED5) = 3 time flash

Description of trouble = Over current

Cause = Overload operation, Overcharge 

Conditions of flashing = When the input current value exceeds the set value. (Compressor stops)

Indoor unit indicator

RUN lamp = Comes on 

TIMER lamp = 4 time flash

Outdoor unit indicator (LED5) = 4 time flash

Description of trouble = Over heat of  power transistor

Cause = Cooling problem

Conditions of flashing =When power transistor temperature exceeds setting value. (Compressor Stops.) 

Indoor unit indicator

RUN lamp = Comes on

TIMER lamp = 5 time flash

Outdoor unit indicator (LED5) = 5 time flash

Description of trouble = Over heat of Compressor

Cause = Gas shortage , Defective discharge pipe thermistor

Conditions of flashing = When discharge pipe thermistor value exceeds setting value. (Compressor Stops.) 

Indoor unit indicator

RUN lamp = Comes on 

TIMER lamp = 6 time flash

Outdoor unit indicator (LED5) = 6 time flash (3)

Description of trouble = Error of signal transmission

Cause = Defective power supply , Broken signal wire, Defective indoor/outdoor unit circuit boads 

Conditions of flashing =  If serial signal cannot be sent or received for 1 minute and 55 seconds continuously.

Notes 

(1) Ceiling recessed type only

(2) Wall mounted type only 

(3) LED 5 will go out when even one unit is operating properly or there is an abnormality with the outdoor unit power supply.  It will also go out during normal operation.

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