Mitsubishi Air Conditioning error codes:

Error code  Description 
P1 Intake sensor error
P2 P9 Pipe (Liquid or 2-phase pipe) sensor error
E6 E7 Indoor/outdoor unit communication error
P4 Drain sensor error
p5 Drain pump error
PA Forced compressor error
p6 Freezing/Overheating safeguard operation
EE Communication error between indoor and outdoor units
P8 Pipe temperature error
E4 Remote controller signal receiving error
Fb Indoor unit control system error (memory error, etc.)
E0 E3 Remote controller transmission error
E1 E2 Remote controller control board error

Check the LED display of the outdoor controller board.

Error code  Description 
E9  Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
U3,U4 Open/short of outdoor unit thermistors
UF Compressor overcurrent interruption (When compressor locked)
U2 Abnormal high discharging temperature/49C worked/insufficient refrigerant
U1 ,Ud Abnormal high pressure (63H worked)/Overheating safeguard operation
U5 Abnormal temperature of heat sink
U8 Outdoor unit fan safeguard stop
U6 Compressor overcurrent interruption/Abnormal of power module
U7 Abnormality of super heat due to low discharge temperature
U9  UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/ Current sensor error.

Mr.Slim A-control error code list

Error code  Description 
EA Error detail Mis-wiring of indoor/outdoor unit. exceed the number of indoor unit connection.
Eb Error detail Mis-wiring of indoor/outdoor unit. (mis-wiring disconnection)
EC Error detail Start-up time over
E6 Error detail Indoor/outdoor unit transmission error (signal receiving error).
E7 Error detail Indoor/outdoor unit transmission error (transmitting error).
E8 Error detail Indoor/outdoor unit transmission error (signal receiving error).
E9 Error detail Indoor/outdoor unit transmission error (transmitting error).
E0  Error detail Remote control transmission error (signal receiving error)
E3 Error detail Remote control transmission error (transmitting error)
E4 Error detail Remote control transmission error (signal receiving error)
E5 Error detail Remote control transmission error (transmitting error)
EF Error detail M-NET transmission error
ED Error detail Serial transmission error
P1 Error detail Abnormality of room temperature thermistor (TH1).
P2 Error detail Abnormality of pipe temperature themistor/liquid (TH2).
P4 Error detail Abnomarlity of drain sensor (DS)
P5 Error detail Malfunction of the drain-up machine.
P6 Error detail Freezing/overheating protection detect.
P8 Error detail Abnormality of pipe temperature.
P9 Error detail Abnormality of pipe temperature thermistor/condenser/evaporator (TH5)
F1 Error detail Reverse phase detection.
F2 Error detail L3 open phase detection.
F3 Error detail 63L connector open
F4 Error detail 49C connector open
F9 Error detail Connector 2 or more open.
FA  Error detail L2-phased open phase or 51CM connector open
F7  Error detail Reverse phase detection circuit (p.c.board) fault.
F8 Error detail Input circuit fault.
U2 Error detail Abnormal high discharging temperature.
U2 Error detail Inner thermostat (49C) operation.
U1 Error detail Abnormal high pressure (high pressure swicth 63H worked)
UE Error detail High-pressure error (ball valve closed)
UL Error detail Abnormal low pressure
Ud Error detail Overheat protection.
U6 Error detail Compressor overcurrent (overload) cut off.
UA Error detail Compressor over current (terminal relay operation).
UF Error detail Compressor over current (start-up locked) cut off.
UF Error detail Compressor over current (operating locked) cut off.
UH Error detail Current sensor error.
U3 Error detail Discharge thermistor short/open.
U4 Error detail Outdoor thermistor short/open.

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