Troubleshooting MLCAC-UTSM-2010-10
112 Outdoor Units
10.3.2.18. P7 malfunction
P7 display
High temperature protection of
evaporator
Whether compressor
operates?
Yes
Check whether the heat
exchanger is dirty, the air-
outlet is blocked and the
indoor fan is running
normal?
No
Check refrigerant system
(such as clogging of
capillary etc.)
No
Clean the heat exchanger and
the air-outlet
Reconnect and retest
No
Whether the
connection is
good?
No
Check the
resistance value of
the sensor via
Appendix 1,Is it
normal?
Check whether the
indoor fan is running
normal
Replace the temperature sensor
No
Yes
Whether the indoor
PCB is normal?
Replace the indoor PCB
No
Yes
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