Mitsubishi Electric PUMY-P112VKM3 Technical & Service Manual page 57

Check code
1302
(UE)
●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 filter 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.
Continue to the next page
OCH632A
High pressure trouble
Diagnosis
(Clogged filter)
(No clog)
No
(no dirt)
No
(short-cycled)
(no short-cycle)
No
(no dirt)
No
No
Yes
Yes Wash the indoor heat exchanger.
(dirty)
Yes
Wash the outdoor heat exchanger.
Yes
(dirty)
Yes
57
Chart 2 of 4
Remedy
Clean the filter.
Solve the short cycle.
Defective pipes