Compressor Current Interruption - Mitsubishi PUMY-P60NKMU Technical & Service Manual

Check code
Compressor current interruption (Locked compressor)
4100
Abnormal points and detection methods
Abnormal if overcurrent of DC bus or compressor is detected 30 seconds
after the compressor starts operating.
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Check the stop valve.
Is the stop valve fully open?
Check the power supply voltage.
Is the power supply voltage normal?
Turn the power OFF to check for
looseness, disconnection or phases of the
compressor wiring.
Is it connected properly?
Check whether the model selection switch is
set correctly on the controller board or not.
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OCH502C
Diagnosis
No
Yes
No
Yes
No
Yes
Causes and check points
Closed stop valve
Decrease of power supply voltage
Looseness, disconnection or converse of compressor
wiring connection
Model selection error upon replacement of indoor
controller board
Defective compressor
Defective outdoor power board
Ensure power supply from the facility.
Connect the wiring properly,
then turn the power back ON.
49
Chart 1 of 2
Remedy
Open the stop valve.