106
DC Inverter Multi
VRF Service Manual
2.9 PFC Protection
Yes
Yes
Yes
No
No
No
No
Yes
E5 is displayed on
the wired controller
PFC abnormal
Hc is displayed
Monitoring
display
Nixie tube of
mainboard
It is recorded
Is it wet,dirty or
short-circuit?
Inspect the mainboard 1 min
after power off or the buss
voltage is below 36V
Dry, and clean it or
remove short circuit.
Restart the unit.
circuit work work ?
1. If it is affected by damp, find out the
reason and take some precautionary
measures. After drying the mainboard,
brush it with damp proof gum water.
2. If it is polluted, find out the reason
and protect it from dust . If the
environment is bad, clean the dirt
periodically.
3. If it is short-circuit, find out the
reason and clean the electric box so
as to prevent the conductive matter
such as iron chippings adhering on
the board
Is + 15V
of mainboard stable?
15VA-pin 1,2
Is IPM
module of mainboard
damaged?
Replace mainboard
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