TCL CWH09TBAI Service Manual page 36

3) The indoor main PCB damage.
Solution: Replace the indoor main PCB.
10.5.3 Display E3, E7
Reasons:
1) Outdoor pipe temp sensor, outdoor temp sensor & exhaust temp sensor
plugged in.
Solution: Check the connecter of sensor and slot, if loose or not plugged in, please connect again.
2) Outdoor pipe temp sensor, outdoor temp sensor & exhaust temp sensor damage (short or broken).
Solution: Check and replace the sensor.
3) Outdoor PCB damage.
Solution: Check and replace the outdoor PCB.
10.5.4 Display E8
Reasons:
1) Outdoor discharge pipe temp sensor
Air Conditioner Service Manual
Fail
connection terminal loose or not plugged in.
connection terminal loose or not
OK
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