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MXZ-SM42NAMHZ Service Manual

ManualsBrandsMitsubishi ManualsCoolingConcealed Duct 4-Zone H2i System - 42,000 BTU Outdoor - 9k + 9k + 12k + 12k Indoor - 18.0 SEER
61626364656667686970
63
OCH789
Check code
1302
(UE)
High pressure trouble
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
No
Is the voltage normal?
Is it free from any trace of over-
heating or burning?
Replace the indoor controller board.
Check the voltage(*) and appearance of
the indoor controller board.
Check the resistance of SV1.
Chart 3 of 4
*For the voltage, refer to "8-8.HOW
TO CHECK THE COMPONENTS".
No
No
Yes
Yes
Yes
Continued from the previous page.
Is the resistance detected?
Is the resistance detected?
Replace the TH7.
Replace the indoor LEV.
Disconnect the indoor LEV wiring to check
the resistance.
Continue to the next page.