Trane 09CH-FIXED-A1, Service Manual

Page: 35 / 50

3.2.3 P7---Overheating protection on Cooling mode
On heating mode, when IDU evaporator coil temperature IPT
≥62
℃
, ODU PCB will switch off outdoor unit and
show P7 failure code.
Display P7
ODU fan motor
works normal?
Replace IPT sensor
Replace IDU PCB
Fan motor
broken?
Replace fan motor
End
No
No
Yes
Yes
P7 disappear?
P7 disappear?
Yes No
Yes
No
The sensor open
or short circuit?
No
Yes
Sensor loosing
from connector?
Re-connect sensor
P7 disappear?
Yes
Yes
No
Air Conditioner Service Manual
34