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MXZ-SM42NAMHZ Service Manual

ManualsBrandsMitsubishi ManualsCoolingOne-Way Ceiling 4-Zone H2i System - 42,000 BTU Outdoor - 9k + 12k + 12k + 12k Indoor - 22.0 SEER
61626364656667686970
68
OCH789
Check code
1501
(U2)
Refrigerant shortage trouble
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
Chart 2 of 2
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Continued from the previous page.
Is the voltage detected?
Is the voltage normal value?
Is it free from any trace of over-
heating or burning?
Is the resistance detected?
Replace the outdoor controller board.
Replace the 63HS.
Replace the indoor LEV.
Replace the indoor controller board.
Check the 63HS voltage.
Check the voltage and appearance of the
outdoor controller board.
Disconnect the indoor LEV wiring and
check the resistance.
Is the resistance detected? Replace the thermistor.