Mitsubishi PUMY-P60NKMU Technical & Service Manual page 40

Check code
1302
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Continued from the previous page
Is the indoor unit fi lter clogged?
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?
Disconnect the TH7 wiring and check the
resistance.
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OCH502C
High pressure trouble
Diagnosis
(Clogged fi lter)
(No clog)
No
Yes
(dirty)
(no dirt)
No
Yes
(short-cycled)
(no short-cycle)
No
Yes
(dirty)
(no dirt)
No
Yes
No
Yes
Wash the indoor heat exchanger.
Wash the outdoor heat exchanger.
40
Chart 2 of 4
Remedy
Clean the fi lter.
Solve the short cycle.
Defective pipes.