Mitsubishi Electric PUMY-P36NKMU2-BS Technical & Service Manual page 61

Check code
1501
(U2)
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Continued from the previous page.
Is the resistance detected?
Check the 63HS voltage.
Is the 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 the resistance detected?
OCH695B
Refrigerant shortage trouble
Diagnosis
Yes
Yes
Yes
Yes
Yes
No
No
Replace the outdoor controller board.
No
No
Replace the indoor controller board.
61
Chart 2 of 2
Remedy
Replace the thermistor.
Replace the 63HS.
Replace the indoor LEV.