Mitsubishi Electric PUMY-P250YBM Technical & Service Manual page 57

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 set properly?
Check whether the compressor is faultily
grounded or not.
Is the compressor faultily grounded?
OCH760
Diagnosis
Yes
Yes
Set the model selection switch correctly,
No
then restart.
Replace the compressor (Defective compressor).
No
Replace the outdoor power circuit board
(Defective outdoor power circuit board).
57
Chart 2 of 2
Remedy