OCH791 _28
1302 (UE): High pressure trouble
Chart 2 of 4
Diagnosis of failure
Yes
(Clogged filter)
Yes
(Dirty)
Yes
(Dirty)
Yes
(Short-cycled)
Yes
No
(Not clogged)
No
(Not dirty)
No
(Not dirty)
No
No
(Not short-cycled)
Clean the filter.
Continued from the previous page.
Wash the indoor heat exchanger.
Resolve the short cycle.
Wash the outdoor heat exchanger.
Check and repair piping.
Continue to the next page.
Disconnect the TH7 wiring and check the
resistance.
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?