Mitsubishi Electric PUHZ-W50VHA Technical Manual page 38

9.3.3. Malfunction-diagnosis method by remote controller
Refer to the following tables for details on the check codes.
Errors detected by indoor unit
Check code
P1 Intake sensor error
P9 Pipe (TH5) sensor error
P2 Pipe (TH2) sensor error
E6,E7 Interface controller/outdoor unit communication error
P6 Freezing/Overheating protection operation
EE Communication error between indoor and outdoor units
P8 Pipe temperature error
E4, E5 Remote controller signal receiving error
— —
— —
Fb Interface controller 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 code
Interface controller/outdoor unit communication error
E8
(Signal receiving error)
Interface controller/outdoor unit communication error
E9
(Transmitting error) (Outdoor unit)
UP Compressor overcurrent interruption
U3,U4 Open/short of outdoor unit thermistors
UF Compressor overcurrent interruption (When compressor locked)
U2 Abnormal high discharging temperature/insuffi cient refrigerant
Abnormal high pressure (63H worked)/Overheating protection opera-
U1,Ud
tion
U5 Abnormal temperature of heatsink
U8 Outdoor unit fan protection stop
U6 Compressor overcurrent interruption/Abnormal of power module
U7 Abnormality of superheat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and abnormal
U9,UH
synchronous signal to main circuit/Current sensor error
— —
— —
Others Other errors (Refer to the technical manual for the outdoor unit.)
Symptom
Symptom
38
Remark
—
Remark
For details, check the LED display
of the outdoor controller board.