21
No.
Malfunction
Name
Dual-8
Code
Display
Operation
Indicator
Cool
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
AC Status Possible Causes
35 IPM protection H5
OFF 1S
and blink
4times
During cooli ng and drying
operation, compressor s tops
while indoor fan operate.
During heating operation, the
unit stops operation.
Refer to the malfunction analys is
(IPM protection, lo ss of
synchronism protecti on and
over-current protection of phase
current for compressor
36
Module
temperature is
too high
H5
OFF 1S
and blink
10 times
37
Internal motor
(fan motor) do
not operate
H6
Internal fan motor, external fan
motor, compressor and
electric heater stop operation,
guide louver stops at present
location.
1. Bad c ontact of DC motor
feedback terminal.
2. Bad c ontact of DC motor control
end.
3. Fan motor is stalling.
4. Motor malfunction.
5. Malfunction of mainboard rev
detecting circui t.
38
Desynchronizing
of compressor
H7
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
complete unit stops operation.
Refer to the malfunction analys is
(IPM protection, lo ss of
synchronism protecti on and
over-current protection of phase
current for compressor.
39 PFC protection HC
OFF 1S
and blink
14 times
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
unit stops operation.
Refer to the malfunction analys is
40
Outdoor DC fan
motor
malfuncti on
L3
OFF 1S
and blink
14 times
Outdoor DC fan motor
malfunction lead to
compressor stop operation.
DC fan motor malfunction or
system blocked or the connector
loosened.
41 power protection L9
OFF 1S
and blink
9times
Compressor stops operation
and Outdoor fan motor stops
30s later, 3 m inutes later fan
motor and compressor restarts
To protect the electronic
components when detect high
power
42
Indoor unit and
outdoor unit
does not match
LP
OFF 1S
and blink
16 times
Compressor and Outdoor fan
motor can not work
Indoor unit and outdoor unit does
not match
43 Fail ure start- up LC
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
unit stops operation.
Refer to the malfunction analys is
44
Malfuncti on of
voltage dropping
for DC bus-bar
U1
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
unit stops.
Replace outdoor c ontrol panel AP1
45
Malfuncti on of
voltage dropping
for DC bus-bar
U3
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
unit stops.
Supply voltage is unstable
46
Malfuncti on of
complete units
current detection
U5
During cooli ng and drying
operation, compressor s tops
while indoor fan operates;
during heating operating, the
unit stops operation.
There is a c ircuit malfunction on
outdoor units control panel A P1,
replace the outdoor units control
panel AP1.
47
The four-way
valve is
abnormal
U7
If this malfuncti on occurs
during heating operation, the
unit wil l stop operation.
1.Supply voltage is lower than
AC175V;
2.Wiring terminal to the four way
valv e is loose or broken;
3.four way val ve is damaged,
replace four way valve.
48
Zero-crossing
malfuncti on of
outdoor unit
U9
During cooli ng operation,
compressor stops while indoor
fan operates; during heating,
the complete unit stops
operation.
Replace outdoor c ontrol panel AP1
49
Frequency
limiting (power)
OFF 1S
and blink
13 times
50
Compressor
running
OFF 1S
and blink
once
51
The temperature
for turning
on the unit is
reached
OFF 1S
and blink
8times
52
Frequency
limi ting (module
temperature)
OFF 1S
and blink
11 times
53
Normal
communic ation
OFF 0.5S
and blink
once
54 Defrosti ng
OFF 3S
and blink
once
(during
blink ing,
ON 10s
and OFF
0.5s)
Defrosting occurs in heating
mode. Compressor operates
while indoor fan stops
operation.
It is the normal state
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