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115 PB
TROUBLESHOOTING
Diagnostic Codes
No. Malfunction
Name
Display Method of Indoor Unit Display Method of Outdoor Unit A/C status Possible Causes
Dual‑8
Code
Display
Indicator Display (During blinking,
ON 0.5s and OFF 0.5s)
Indicator has 3 kinds of display status
and during blinking, ON 0.5s and
OFF 0.5s
Power
Indicator
Cool
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
33 overload
protection
for compres‑
sor
H3 OFF 3s
and blink
3 times
OFF 1s
and blink
8 times
During cooling and drying op‑
eration, 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 protec‑
tion, overload)
34 system is
abnormal
H4 OFF 3s
and blink
4 times
OFF 1s
and blink
6 times
During cooling and drying op‑
eration, 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)
35 IPM protec‑
tion
H5 OFF 3S
and blink
5 times
OFF 1s
and blink
4 times
During cooling and drying op‑
eration, compressor will stop
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection
and overcurrent protection of
phase current for compressor.
36 module
temperate is
too high
H5 OFF 3s
and blink
5 times
OFF 1s
and blink
10 times
37 internal
motor ( fan
motor) does
not operate
H6 OFF 3s
and blink
11 times
Internal fan motor, external
fan motor, compressor
and electric heater stop
operation,guide louver stops
at present location.
1. Bad contact of DC motor
feedback terminal.
2. Bad contact of DC motor
control end.
3.Fan motor is stalling.
4. Motor malfunction.
5. Malfunction of mainboard
rev detecting circuit.
38 desynchro‑
nizing of
compressor
H7 OFF 3s
and blink 7
times
During cooling and drying op‑
eration, compressor will stop
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection
and overcurrent protection of
phase current for compressor.
39 PFC protec‑
tion
HC OFF 3s
and blink 6
times
OFF 1s
and blink
14 times
During cooling and drying op‑
eration, compressor will stop
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
Refer to the malfunction
analysis
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