Mitsubishi Electric PUMY-P250YBM2-ER Technical & Service Manual page 46

Check code
1302
(UE)
●Diagnosis of defects
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.
TCH091
High pressure trouble or
High compressor temperature trouble
Diagnosis
(Clogged filter)
(No clog)
No
(dirty)
(no dirt)
No
(short-cycled)
(no short-cycle)
No
(dirty)
(no dirt)
No
No
Yes
Wash the indoor heat exchanger.
Yes
Yes
Wash the outdoor heat exchanger.
Yes
Yes
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Chart 2 of 4
Remedy
Clean the filter.
Resolve the short cycle.
Correct defective pipes.