61
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
44
Malfunction
of complete
units current
detection
U5
During cooling and drying
operation, the compressor will
stop while indoor fan will operate;
During heating operating, the complete
unit will stop operation.
Theres circuit malfunction on outdoor
units control panel AP1, please replace
the outdoor units control panel AP1.
45
The four-way
valve is
abnormal
U7
If this malfunction occurs during heating
operation, the complete unit will stop
operation.
1.Supply voltage is lower than AC175V;
2.Wiring terminal 4V is loosened or
broken;
3.4V is damaged, please replace 4V.
46
Frequency
limiting
(power)
47
Compressor
is open-
circuited
48
The
temperature
for turning
on the unit is
reached
49
Frequency
limiting
(module
temperature)
50
Malfunction
of detecting
plate(WIFI)
JF
51
PFC
protection
HC
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop operation
Replace outdoor control panel AP1 or
Reactor
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