Mitsubishi PUMY-P60NKMU Technical & Service Manual page 46

Check code
1501
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Continued from the previous page
Is there a resistance detected?
Check the 63HS voltage.
Is there a voltage detected?
Check the voltage and appearance of the
outdoor controller board.
Is the voltage normal value?
Is it free from any trace of over-
heating or burning?
Disconnect the indoor LEV wiring and
check the resistance.
Is there a resistance detected?
OCH502C
Refrigerant shortage trouble
Diagnosis
No
Yes
No
Yes
Yes
No
Yes
No
Yes
Replace the thermistor.
Replace the outdoor controller board.
Replace the indoor LEV.
Replace the indoor controller board.
46
Chart 2 of 2
Remedy
Replace the 63HS.