37
Installation and Maintenance
Service Manual
NO.
Malfunction
Name
Display Method of Indoor Unit
A/C status
Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
52
Normal
communica-
tion
53
54
Defrosting
PFC
protection
HC
55
U8
OFF 3S
and blink
once
(during
blinking,
ON 10s
and OFF
0.5s)
Defrosting will occur in
heating
mode. Compressor will
operate
while indoor fan will stop
The complete unit stops
During cooling and drying
operation, compressor will
stopwhile indoor fan will
operate;During heating
operation, the complete unit
will stop operation.
operation.
Its the normal state
Replace outdoor control panel
AP1 or Reactor
1.Power supply is abnormal;
2.Detection circuit of indoor
control mainboard is abnormal.
Malfunction
of zero-cross
detection
circuit
