TCL CWH09TBAI Service Manual page 38

1 N L
5) Communication fault if resistance or optical coupler broken, replace outdoor PCB.
6) Is there any burnt on PCB? If no, test the rectifier, FRD, IGBT etc. any component broken, replace
PCB.
7) Test the DC voltage between DC+ and DC-. If the voltage is less than 50V approximately, please
replace outdoor PCB.
10.5.2 Display EA
Reason:
Current sensor fault.
Solution:
Check for refrigerant leakage, to find the leakage point and recharge the refrigerant.
1)
Current sampling circuit broken on the outdoor PCB and replace outdoor PCB.
2)
10.5.3 Display E9（first display P0 or P9）
Reason: Outdoor PCB drive circuit damage.
Air Conditioner Service Manual
Communication
circuit
DC-
DC
+
Any of 2 pins should be
no short circuit
Any of 2 pins should be
no short circuit
Any of 2 pins should be
no short circuit
Current sampling
circuit
37