Mitsubishi Electric PUMY-P36NKMU3 Technical & Service Manual page 65

Check code
Compressor current interruption (Locked compressor)
4100
(UF)
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Continued from the previous page.
Are they connected properly?
Check whether the compressor is faultily
grounded or not.
Is the compressor faultily grounded?
OCH733
Diagnosis
Yes
Yes
Connect the compressor wiring (U, V and
W phase) properly, then turn the power
No
back ON.
Replace the outdoor power circuit board
No
(Defective outdoor power circuit board).
Replace the compressor (Defective compressor).
65
Chart 2 of 2
Remedy