Mitsubishi Electric PUMY-P200YKM2 Technical & Service Manual page 72

Check code
5300
(UH)
Abnormal points and detection methods
If the detected current sensor input value (primary current) during
compressor operation is outside the specified range.
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Check the input current at the time of
abnormal stop.
Does it satisfy the condition 1 in
the lower right?
Check the compressor wiring for
disconnection or looseness.
Is there any abnormality such as
disconnection or looseness?
OCH675D
Primary current error
Diagnosis
No
No
Causes and checkpoints
Decrease/trouble of power supply voltage
Disconnection of compressor wiring
Input sensor trouble on outdoor power circuit board
The power supply voltage is decreased or
abnormal.
Yes
Check the power supply facility.
Condition 1:
34A or more for 10 consecutive seconds, or
38A or more.
Connect the compressor wiring properly.
Yes
Replace the outdoor power circuit board
(Malfunction of current sensor circuit).
72
Remedy