Gree HOME GMV [239/367] Pfc protection

Dc Inverter VRF plus Water Heater Solution Service Manual SERVICING

235

2.9 PFC protection

E5 displayed on

hand controller

Monitor display

PFC abnorma

Cut off the power for 1

minute or reduce the

busbar voltage to 36V o

lower. Then, check the

mainboard.

If it is moistened,

dirty or short

circuited?

Dry the PFC board and

clear off the dirt o

eliminate the

short-circuit point.

Work normally?

1. If it is moistened, find out the cause and

take proper measures to prevent moisture. Dry

the PFV board and apply moisture-proof glue.

2. If it is dirty, find out the cause and take

dustproof measures. If the air quality o

service environment is poor, it is also required

to clear off the dirt periodically.

3. If it is short circuit, find out the cause and

clean the electric box to prevent the iron

scraps or other conductive substances from

attaching on the board.

Record and feed back

Replace the mainboard

Yes

Mainboard nixietube

Display Hc

Check if +15V in the

mainboard is stable,

as well as 1,2 role

of 15VA

Check if the PFC in

the mainboard is

damaged