Gree GWH09QB-K3DNA6G Service Manual page 53

Display Method of Indoor Unit
Indicator Display (during
Malfunction
blinking, ON 0.5s and OFF
Dual-8
No.
Name
0.5s)
Code
Display
operation
Indicator
Malfunction of
phase current
43 detection U1
circuit for
compressor
Malfunction of
voltage
44 U3
dropping for
DC bus-bar
Malfunction
of complete
45 U5
units current
detection
The four-way
46 valve is U7
abnormal
Frequency
47 limiting
(power)
Compressor
48 is open-
circuited
The
temperature
49 for turning
on the unit is
reached
Frequency
limiting
50
(module
temperature)
Malfunction
of zero-cross
51 U8
detection
circuit
50
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
Cool Heating Yellow Red
Indicator Indicator Indicator Indicator
OFF 3S
and blink
13 times
OFF 3S
and blink
once
OFF 3S
and blink
8 times
OFF 3S
and blink
11 times
A/C status
Green
Indicator
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling and drying
operation, the compressor will
stop while indoor fan will
operate;
During heating operating,
the complete unit will stop
operation.
If this malfunction occurs
during heating operation,
the complete unit will stop
operation.
The complete unit stops
Service Manual
Possible Causes
Replace outdoor control panel AP1
Supply voltage is unstable
Theres circuit malfunction on
outdoor units control panel AP1,
please replace the outdoor units
control panel AP1.
1.Supply voltage is lower than
AC175V;
2.Wiring terminal 4V is loosened or
broken;
3.4V is damaged, please replace
4V.
1.Power supply is abnormal;
2.Detection circuit of indoor control
mainboard is abnormal.
Installation and Maintenance