Mitsubishi Electric CITY MULTI PUMY-P200YKM2R2 Technical & Service Manual page 59

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?
OCH675E
Diagnosis
Yes
Yes
Set the model selection switch correctly,
No
then restart.
Replace the compressor (Defective compressor).
No
Replace the outdoor power board
(Defective outdoor power board).
59
Chart 2 of 2
Remedy