Gree 4LIV30HP230V1A Service Manual page 50

9. Maintenance
Service Manual
No. Malfunction Name
Malfunction of voltage
43
dropping for DC bus-bar
Malfunction of complete
44
unit's current detection
The four-way valve is
45
abnormal
Malfunction of zero-cross
46
detection circuit
Malfunction of detecting
47
plate(WIFI )
Refrigerant recovery
48
mode
Undefined outdoor unit
49
error
Installation and Maintenance
Display Method of
Indoor Unit
Dual-8 Code
Display
During cooling and drying operation, compressor
will stop while indoor fan will operate;
U3
During heating operation, the complete unit will
stop
During cooling and drying operation, the
compressor will stop while indoor fan will operate;
U5
During heating operating, the complete unit will
stop operation.
If this malfunction occurs during heating
U7
operation, the complete unit will stop operation.
U8 The complete unit stops
Loads operate normally, while the unit can't be
JF
normally controlled by APP.
Fo
Cool: compressor and outdoor fan stops
operation, while indoor fan operates; Heat:
oE
compressor, outdoor fan and indoor fan stop
operation.
A/C status
Supply voltage is unstable
There's circuit malfunction on outdoor unit control
panel AP1, please replace the outdoor unit
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.
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;
Refrigerant recovery. The Serviceman operates it
for maintenance.
1. Outdoor ambient temperature exceeds the
operation range of unit (eg: less than-20
more than 60
heating);
2. Failure startup of compressor?
3. Are wires of compressor not connected tightly?
4. Is compressor damaged?
5. Is main board damaged?
Possible Causes
o C or
o C for cooling; more than 30 o C for
47