P5 Sub-Cooling Protection On Cooling/Dry Mode - Friedrich Chill Premier Inverter Series Service Manual

3.2.12 P5---Sub-cooling protection on Cooling/Dry mode

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
No
Normal
protection
Note: Cooling
mode under low
environment
temperature
easily have P5
protection
Replace sensor
36
TROUBLESHOOTING
Yes
Air filter dirty?
No
air inlet
blocked?
No
Can fan blade
rotate freely?
Yes
Fan motor
works too slow
or stopped
No
Yes
Sensor IPT
abnormal?
No
Replace Display PCB
End
Yes
Clean filter
No
P5 disappear?
Yes
Clean
No
Check and repair
fan blade
Yes
Fan motor
defect?
No
Yes
Yes
P5 disappear?
No
Yes
P5 disappear?
No
Yes
Replace motor
42