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Mitsubishi Electric Air Conditioner Error Codes
Mitsubishi Electric Air Conditioner Error Codes

Mitsubishi Electric AC Error Codes – Mr Slim P/K Series



Error CodeAbnormal points and detection method
F5
(5201)
63H connector open
Eb
(6845)
Miswiring of indoor/outdoor unit
connecting wire (converse wiring or disconnection)
EC
(6846)
Start-up time over
U1
(1302)
High pressure (High-pressure switch
63H operated)
U2
(TH4:1102)
(TH32:1132)
High discharging temperature
High comp. shell temperature
U3
(TH4:5104)
(TH32:5132)
Open/short circuit of discharge
temperature thermistor (TH4) / comp.
shell thermistor (TH32)
U4
(TH3:5105)
(TH6:5107)
(TH7:5106)
(TH8:5110)
Open/short of outdoor unit thermistors
(TH3, TH6, TH7, and TH8)
U5
(4230)
Temperature of heatsink
U6
(4250)
Power module
U7
(1520)
Too low superheat due to low discharge
temperature
U8
(4400)
Outdoor fan motor
Mitsubishi Electric Air Conditioner Error Codes
Mitsubishi Electric Air Conditioner Error Codes
E8
(6840)
Indoor/outdoor unit communication
error (Signal receiving error)
(Outdoor unit)
E9
(6841)
Indoor/outdoor unit communication
error (Transmitting error) (Outdoor unit)
EF
(6607
or
6608)
Non defined error code
Ed
(0403)
Serial communication error
P8Pipe temperature
A0
(6600)
Address duplicate definition
A2
(6602)
Hard ware error of transmission
processor
A3
(6603)
Bus Busy
A6
(6606)
Communication error with communication processor
A7
(6607)
NO ACK signal
A8
(6608)
M-NET NO RESPONSE
U9
(4220)
Overvoltage or voltage shortage and
synchronous signal to main circuit
Ud
(1504)
Over heat protection
UF
(4100)
Compressor overcurrent interruption
(When compressor locked)
UH
(5300)
Current sensor error
UL
(1300)
Low pressure
UP
(4210
Compressor overcurrent interruption
E0
or
E4
Remote controller transmission error
(E0)/signal receiving error (E4)
E1
or
E2
Remote controller control board
E3
or
E5
Remote controller transmission error
(E3)/signal receiving error (E5)
E6
(6840)
Indoor/outdoor unit communication
error (Signal receiving error)
E7Indoor/outdoor unit communication
error (Transmitting error)

Display function of inspection for outdoor unit

Display function of inspection for outdoor unit
Display function of inspection for outdoor unit

The blinking patterns of both LED1 (green) and LED2 (red) indicate the types of abnormality when it occurs. Types of abnormality can be indicated in details by connecting an optional part ‘A-Control Service Tool (PAC-SK52ST)’ to connector CNM on outdoor controller board.

Error codeContents
F5Connector (63H) is open.
E6Indoor/outdoor unit communication error
(signal receiving error) is detected by indoor unit.
E0Remote controller signal receiving
error is detected by remote controller
E3Remote controller transmitting error
is detected by remote controller.
E4Remote controller signal receiving
error is detected by indoor unit.
E5Remote controller transmitting error
is detected by indoor unit.
EFError code is not defined.
EdSerial communication error
controller board and outdoor power
board>
controller board and M-NET p.c. board>
A0~A8Communication error of M-NET
system
U2Abnormality of shell thermistor(TH32)
and discharging temperature (TH4)
U7Abnormality of superheat due
to low discharge temperature
U1Abnormal high pressure (High
pressure switch 63H operated.)
U8Abnormality of outdoor fan
motor rotational speed
UdProtection from overheat operation(TH3)
UFCompressor overcurrent
breaking(Start-up locked)
UPCompressor overcurrent breaking
UHAbnormality of current sensor (P.B.)
U6Abnormality of power module
U3Open/short of discharge thermistor (TH4)
and shell thermistor (TH32)
U4Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8)
U5Abnormality of heatsink
temperature
U9Abnormality of voltage
P1Abnormality of room temperature thermistor (TH1)
P2Abnormality of pipe temperature thermistor /Liquid (TH2)
P9Abnormality of pipe temperature
thermistor/Condenser-Evaporator
P4Abnormality of drain sensor (DS)
Float switch(FS) connector open
P5Indoor drain overflow protection
P6Freezing (cooling)/overheating
(heating) protection
P8Abnormality of pipe
temperature

Malfunction-diagnosis method by wireless remote controller

Malfunction-diagnosis method at maintenance service
Malfunction-diagnosis method at maintenance service

 Errors detected by indoor unit




Check codeSymptom
P1Intake sensor error
P2Pipe (TH2) sensor error
P9Pipe (TH5) sensor error
E6,E7Indoor/outdoor unit communication error
P4Drain sensor error/Float switch connector (CN4F) open
P5Drain pump error
PAForced compressor stop (due to water leakage abnormality)
P6Freezing/Overheating protection operation
EECommunication error between indoor and outdoor units
P8Pipe temperature error
E4, E5Remote controller signal receiving error
FbIndoor unit control system error (memory error, etc.)
E0, E3
Remote controller transmission error
E1, E2 Remote controller control board error

Errors detected by unit other than indoor unit (outdoor unit, etc.)

Check codeSymptom
P1Intake sensor error
P2Pipe (TH2) sensor error
P9Pipe (TH5) sensor error
E6,E7Indoor/outdoor unit communication error
P4Drain sensor error/Float switch connector (CN4F) open
P5Drain pump error
PAForced compressor stop (due to water leakage abnormality)
P6Freezing/Overheating protection operation
EECommunication error between indoor and outdoor units
P8Pipe temperature error
E4, E5Remote controller signal receiving error
FbIndoor unit control system error (memory error, etc.)
E0, E3
Remote controller transmission error
E1, E2 Remote controller control board error
Check codeSymptom
E9Indoor/outdoor unit communication error
2
(Transmitting error) (Outdoor unit)
UPCompressor overcurrent interruption
U3,U4
Open/short of outdoor unit thermistors
UF
Compressor overcurrent interruption (When compressor locked)
U2
Abnormal high discharging temperature/insufficient refrigerant
U1,UdAbnormal high pressure (63H operated)/Overheating
protection operation
U5Abnormal temperature of heatsink
U8Outdoor unit fan protection stop
U6Compressor overcurrent interruption/Abnormal of power module
U7
Abnormality of superheat due to low discharge temperature
U9,UHAbnormality such as overvoltage or voltage shortage and
abnormal synchronous signal to main circuit/Current sensor error
If you need help, information or directions, please just ask.

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