27
Installation and Maintenance
Service Manual
9. Maintenance
No.
Malfunction
Name
Display Method
A/C Status
Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heat
Indicator
28
Charging
malfunction
of capacitor
PU
OFF 3S
and blink
17 times
During cooling and drying operation,
compressor will stop
while indoor fan will operate;During
heating operation, the
complete unit will stop
Refer to the part three—charging
malfunction analysis of capacitor
29
Malfunction
of module
temperature
sensor circuit
P7
OFF 3S
and blink
18 times
During cooling and drying operation,
compressor will stop
while indoor fan will operate;During
heating operation, the
complete unit will stop
Replace outdoor control panel AP1
30
Module high
temperature
protection
P8
OFF 3S
and blink
19 times
During cooling operation,compressor
will stop while indoor fan will operate;
During heating operation, the
complete unit will stop
After the complete unit is
deenergized for 20mins, check
whether the thermal grease on IPM
Module of outdoor control panel
AP1 is sufficient and whether the
radiator is inserted tightly. If its no
use, please replace control panel
AP1.
31
Decrease
frequency due
to high
temperature
resistant during
heating
operation
HO
OFF 3S
and blink
10 times
All loads operate normally,
while operation frequency for
compressor is decreased
Refer to the malfunction analysis
(overload, high temperature
resistant)
32
Overload
protection for
compressor
H3
OFF 3S
and blink
3 times
During cooling and drying operation,
compressor will stop while indoor fan
will operate;During heating operation,
the complete unit will stop operation.
1. Wiring terminal OVC-COMP
is loosened. In normal state, the
resistance for this terminal should
be less than 1ohm.
2.Refer to the malfunction analysis
( discharge protection, overload)
33
System is
abnormal
H4
OFF 3S
and blink
4 times
During cooling and drying operation,
compressor will stop while indoor
fan will operate; During heating
operation, the complete unit will stop
operation
Refer to the malfunction analysis
(overload, high temperature
resistant)
34
Malfunction
of detecting
plate(WIFI )
JF
Loads operate normally, while the
unit
can’t be normally controlled by APP.
1. Main board is damaged;
2. Detection board is damaged;
3. The connection between indoor
unit and detection board is not
good;
