DC INVERTER MULTI VRF MAINTENANCE
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
No
Yes
No
No
No
Yes
Yes
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
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