TCL TAC-18CSD/XA81I

TCL Air Conditioner Service Manual
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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
Y
es
Y
es
No
No
P8 disappear?
The sensor open or
short circuit?
P8 disappear?
No
No
Y
es
Yes
No
Yes