TCL TAC-18CSD/XA81I

TCL Air Conditioner Service Manual
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47
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3.2.13 P5---Sub-cooling protection on Cooling/Dry mode
On Cooling or Dry mode, when IDU evaporator coil temperature IPT＜1℃ continuously for 3 min after compressor
start up for 6 min, CPU will switch off outdoor unit and show P5 failure code.
Display P5
Switch on unit
after minutes
Display P5
Normal
t
ti
No
Y
es
IDU filter dirty?
Y
es
Clean filter
IDU air inlet
blocked?
No
Clean
Y
es
Can fan blade
rotate freely?
Check and repair
fan blade
Fan motor
works too slow
or stopped
Fan motor
defect?
Replace motor
Y
es
No
Sensor IPT
abnormal?
Replace sensor
Y
es
Y
es
No
No
No
Y
es
No
Note: Cooling
mode under low
environment
temperature
easily have P5
protection
End
P5 disappear?
P5 disappear?
P5 disappear?
No
Y
es
Y
es
No
Replace IDU PCB
Y
es
No