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P8 Exhaust Air Overtemperature/Under temperature protection
3.2.15 P8---Outdoor Overtemperature/Under-temperature protection
A P8 fault will occur if the following conditions occur and force the compressor to shut down for more than 200
seconds.
(1). On Cooling or Dry mode: Oudoor ambient temperature: OAT＜-4˚F or OAT ＞145˚; F
(2). On Heating mode:
a. OAT≥104˚F or
b. 86˚F＜OAT≤104˚ Fand RT＞95˚F
temperature under
spec. range?
The sensor open
or short circuit?
Replace OAT sensor
No
P8 disappear?
Replace Main PCB
39
TROUBLESHOOTING
Display P8
Ambient
No
Yes
No
Yes
Yes
End
No enough space for
Outdoor ventilation?
No
Yes
Yes
Change unit
location
P8 disappear?
No
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