57
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
U8
55 JF
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
operation.
Its the normal state
1.Power supply is abnormal;
2.Detection circuit of indoor
control mainboard is abnormal.
Malfunction
of detecting
plate(WIFI )
Malfunction
of zero-cross
detection
circuit
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