Mitsubishi Electric PUMY-P250YBM Technical & Service Manual page 52

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 multi controller circuit 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?
OCH760
Refrigerant shortage trouble
Diagnosis
Yes
Yes
Yes
Yes
No
No
Replace the outdoor multi controller circuit
No
board.
No
Replace the indoor controller board.
52
Chart 2 of 2
Remedy
Replace the thermistor.
Replace the 63HS.
Replace the indoor LEV.