Gree GWH18AGD-K6DNA1D/I - Page 71

68
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
34
Desynchro-
nizing of
compressor
H7
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 (IPM protection,
loss of synchronism protection and overcurrent
protection of phase current for compressor.
35
Outdoor DC
fan motor
malfunction
L3
Outdoor DC fan motor malfunction
lead to compressor stop operation,
DC fan motor malfunction or system blocked or
the connector loosed
36
power
protection
L9
compressor stop operation and
Outdoor fan motor will stop 30s latter
, 3 minutes latter fan motor and
compressor will restart
To protect the electronical components when
detect high power
37
Indoor unit
and outdoor
unit doesnt
match
LP
compressor and Outdoor fan motor
can't work
Indoor unit and outdoor unit doesnt match
38
Failure start-
up
LC
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
39
Anti-freezing
protection for
evaporator
E2
Not the error code. It’s the status code for the
operation.
40
Cold air
prevention
protection
E9
Not the error code. It’s the status code for the
operation.
41
Malfunction of
phase current
detection
circuit for
compressor
U1
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
42
Malfunction
of voltage
dropping for
DC bus-bar
U3
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
Supply voltage is unstable
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.
46
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.
46
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;