45
Installation and Maintenance
Service Manual
No.
Malfunction
Name
Display Method of
Indoor Unit
A/C status
Possible Causes
Dual-8
Code
Display
43
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.
44
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.
45
Cold air
prevention
protection
E9
Not the error code. It’s the
status code for the operation.
46
Defrosting
Heating indicator off for
0.5s and then blinks for
10s
Not the error code. It’s the
status code for the operation.
47
Refrigerant
recovery
mode
Fo
Refrigerant recovery. The
Serviceman operates it for
maintenance.
48
Malfunction
of zero-cross
detection
circuit
U8
The complete unit stops
1.Power supply is abnormal;
2.Detection circuit of indoor control
mainboard is abnormal.
49
Malfunction
of detecting
plate(WIFI )
JF
Loads operate normally,
while the unit can’t be
normally controlled by APP.
1.Main board of indoor unit is
damaged;
2.Detection board is damaged;
3.The connection between
indoor unit and detection
board is not good;
