Mitsubishi Electric MXZ-4C36NAHZ Service Manual page 50

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?
OCH573
Refrigerant shortage trouble
Diagnosis
Yes
Yes
Yes
Yes
Yes
No
No
Replace the outdoor controller board.
No
No
Replace the indoor controller board.
50
Chart 2 of 2
Remedy
Replace the thermistor.
Replace the 63HS.
Replace the indoor LEV.