Gree GWH09AGA-K6DNA1A/I, Service Manual

Page: 63 / 117

60
Installation and Maintenance
Service Manual
NO.
Malfunction
Name
Display Method of
Indoor Unit
A/C status Possible Causes
Dual-8 Code
Display
42
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
43
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
44
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.
There's circuit malfunction on outdoor units
control panel AP1, please replace the outdoor
units control panel AP1.
45
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
Anti-freezing protection
for evaporator
E2
Not the error code. It’s the status code for
the operation.
47
Cold air prevention
protection
E9
Not the error code. It’s the status code for
the operation.
48
Refrigerant recovery
mode
Fo
Refrigerant recovery. The Serviceman
operates it for maintenance.
49
Undefined outdoor unit
error
oE
Cool: compressor and outdoor fan stops
operation, while indoor fan operates; Heat:
compressor, outdoor fan and indoor fan
stop operation.
1. Outdoor ambient temperature exceeds the
operation range of unit (eg: less than-20oC or
more than 60oC for cooling; more than 30oC
for heating);
2. Failure startup of compressor?
3. Are wires of compressor not connected
tightly?
4. Is compressor damaged?
5. Is main board damaged?