Everwell MGTC0913C-20, Руководство по обслуживанию, Страница: 46 / 53

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.
1 .5. Display EA
Reason: Current sensor fault .
Solution:
1)
Check for refrigerant leakage, to find the leakage point and recharge the refrigerant.
2)
Current sampling circuit broken on the outdoor PCB and replace outdoor PCB.
1 .5. Display E9
（
first display P0 or P9
Reason: Outdoor PCB drive circuit damage.
Communication
circuit
1 N L
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
DC-
DC
+
Current sampling
circuit
Air Conditioner Service Manual
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