55
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
55
Defrosting
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
operation.
Its the normal state
U8
JF
Flash 17
times
every 3s
Malfunction
of detecting
plate(WIFI )
1. Discharging speed of
capacitor is slow, which lead
to wrong judgement of
controller.
Zero-crossing detection
circuit of main board is
abnormal
Refer to maintenance flowchart
Zero-crossing
inspection
circuit malfun-
ction of the
IDU fan motor
