MXZ-SM48NAMHZ Service Manual

62
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
Chart 2 of 4
No
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Is the indoor unit lter clogged? Clean the lter.
(Clogged lter)
(No clog)
Continued from the previous page.
Is there dirt on the indoor heat
exchanger?
Is the outdoor unit short-cycled?
Is there dirt on the outdoor heat
exchanger?
Are the pipes clogged or broken?
Wash the indoor heat exchanger.
Solve the short cycle.
Wash the outdoor heat exchanger.
Correct defective pipes.
(dirty)
(dirty)
(short-cycled)
(no dirt)
(no dirt)
(no short-cycle)
Continue to the next page.
Disconnect the TH7 wiring and check the
resistance.