Air Conditioner Service Manual
3
2
4) If the 1 & N voltage is normal, measure the voltage between the outdoor terminal 1 and N. If the
voltage has no change, firstly replace the indoor main PCB. If the fault remains unsolved, replace the
outdoor PCB.
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
1
.5.5 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.
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
