Everwell MKTH1223E-16 - 3.2.16 Troubleshooting P8: Outdoor Temp Protection

Air Conditioner Service Manual
45
3.2.16 P8---Outdoor Overtemperature/Under-temperature protection
When environment temperature as below condition, the compressor will stop working, after 200s delay, the IDU will
show P8 failure code.
(1). On Cooling or Dry mode: ODU ambient temperature: OAT＜-20℃ or OAT＞63℃;
(2). On Heating mode:
a. OAT≥40℃
b. 30℃＜OAT≤40℃ and RT＞35℃
Display P8
Ambient
temperature under
spec. range?
Replace OAT sensor
End
Replace ODU PCB
No enough space for
ODU ventilation?
Change ODU
location
Yes
Yes
No
No
P8 disappear?
The sensor open
or short circuit?
P8 disappear?
No
No
Yes
Yes
No
Yes