Omega WM 09K Service Manual page 48

6) Test the DC voltage between DC+ and DC-. If the voltage is less than 50V approximately, please
replace outdoor PCB.
11.3.6 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)
11.3.7 Display E9（first display P0 or P9）
Reason: Outdoor PCB drive circuit damage.
Solution:
Re-energize and check the protection code on display. Firstly display P0.
1) If this code is displayed when the compressor is started for several seconds or even not started, check
the compressor connection for correctness, if no insert wrong, replace outdoor PCB.
2) Check if the outdoor module is tightly installed onto the radiating fins and if the silicone is applied
evenly, fix the screws again if loose.
Air Conditioner Service Manual
DC
DC-
Compressor connection
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
40