Mitsubishi CAHV air conditioners error codes

ERROR CODEDESCRIPTION
AFSAWater supply cut-off (flow switch has been triggered) - check flow switch and wiring
AHP1High pressure fault - check water flow, possible high pressure sensor fault LEV fault
AdSHCompressor crank case temperature of 10°C or less for 40 minutes while compressor in operation -
check for possible failure of fan motor , low pressure sensor , compressor shell thermistor ,
high pressure sensor , discharge thermistor (TH1 TH5), LEV or SV2
1303Low pressure protection low pressure below 6 bar within 30 sec of start up - possible failure of LP
sensor , air inlet thermistor fault (TH4 TH8), suction temperature (TH2 TH6), LEV bypass check valve
1103Compressor shell bottom temperature exceeded 80°C detected whilst compressor running
5109Compressor shell thermistor faulty (TH3 TH6), LEV failure
5110Outside temperature thermistor fault - check TH9
5112Water inlet temperature - check TH10 main circuit
5111Water inlet temperature - check TH12 sub circuit
5113Outlet water temperature - check TH11 main circuit
5103Outlet water temperature - check TH12 sub circuit
5107Compressor shell temperature - check TH3 main circuit
5101Compressor shell temperature - check TH7 sub circuit
5105Discharge temperature - check TH1 main circuit
5102Discharge temperature - check TH5 sub circuit
5106Inlet temperature - check TH2 main circuit
5104Inlet temperature - check TH6 sub circuit
5108Air to refrigerant heat exchanger inlet temperature - check TH4 main circuit
5114Air to refrigerant heat exchanger inlet temperature - check TH8 sub circuit
5115Common return water when using multiple outdoors - check TH14
5117Common return water when using multiple outdoors - check TH15
5118High pressure sensor or high pressure fault - check 63HS sensor or 63H (hp switch)
7113Low pressure sensor low or low pressure fault - check 63LS
7117Model setting error 1 - mis-set switch
4115Model setting error 2 - faulty Z21 resistor
A471Power supply frequency fault - power supply frequency is not 50Hz or 60Hz
4106 (255)Open phase - check incoming power supply and main circuit board
AC61Power supply fault - check transmission power supply or if PCB faulty
1104Discharge temperature fault - 120°C detected during compressor operation -
check water flow, pump, high pressure sensor fault or LEV fault
4250 4255 (101)Heat exchanger freeze up - drop in water flow during defrost - check 4 way valve
4250 4255 (102)Inverter IPM error - check inverter board, compressor or condenser fan motor down to earth
4250 4255 (103)ACCT over current detection - check inverter board, compressor or condenser fan motor down to earth
4250 4255 (107)DCCT over current detection ≥ 56A or greater detected - check inverter board, compressor
or condenser fan motor down to earth
4250 4255 (106)Over current relay trip ≥ 33A rms detected
4250 4255 (104)Over current relay trip ≥ 56A rms detected
4250 4255 (105)Inverter IPM error - check inverter board, compressor down to earth, IPM fault
4250 4255 (108)Overload short circuit - ground fault of the compressor or fan motor detected or
short circuit on signal wire
4250 4255 (109)Bus voltage drop - power supply voltage dropped below 180V inter phase -
check inverter board CNDC2 wiring, 72C fault or diode stack failure
4250 4255 (111)Bus voltage rise - check input voltage, possible inverter board fault
4250 4255 (131)Logic error - external noise interference, faulty grounding, shielded cable not used, inverter board fault
4230 4235Bus voltage drop at start up - check mains input power , PCB fault
4240 4245Heat sink fault - check incoming voltage, air flow around the heat sink, fan motor failure,
THHS failure or if IPM loose
5301 5305 (115)Overload protection - check incoming voltage, air flow around the heat sink,
inverter board fan output failure, THHS failure, compressor failure or current sensor failure
5301 5305 (116)ACCT sensor fault - inverter board fault - compressor down to ground and IPM fault
5301 5305 (117)DCCT sensor fault - compressor down to ground and IPM fault
5301 5305 (118)ACCT sensor fault - ACCT sensor faulty
5301 5305 (119)DCCT sensor fault - DCCT sensor faulty or inverter board fault
5301 5305 (120)Open circuited IPM ACCT sensor disconnected - ACCT faulty, compressor open circuit or IPM fault
5110(01)(05)Incorrect wiring - ACCT Fault
0403(01)(05)THHS sensor fault - thermistor circuit on the inverter board faulty
6830Serial communication error - communication error between control board, interference or broken wiring
7105Multiple address error - more than one unit on the system has the same address
6831Non-consecutive address error - address setting error non-consecutive
6832MA remote controller signal error - remote controller not connected or communication circuit
fault on the control board
6834MA remote controller signal transmission error - communication error due to external noise or
communication circuit fault on the control board
7102MA remote controller signal transmission error - communication error due to external noise,
communication circuit fault on the control board
7130Number of connected units error - either too many indoor units connected or M-NET cannot
communicate with any indoor units
6500Incompatible combination of units, different type of units are connected to the same system
communication error between master and sub units, contact failure on CN102 or connection
failure at the MA-MB terminal block on the main circuit or TB3 on the sub unit
6600Transmission line power supply PCB fault - M-NET transmission wiring failure
between master and sub unit
6602Transmission line power supply PCB fault - M-NET transmission wiring failure
between master and sub unit
6603Transmission line power supply PCB fault
6606Transmission line power supply PCB fault
6607Transmission line power supply PCB fault - faulty M-NET transmission wiring
6608Transmission line power supply PCB fault - faulty M-NET transmission wiring