Maintenance; Trouble Table; Main Control Malfunction - Gree GUHD09NK3FO Service Manual

MAINTENANCE

1 TROUBLE TABLE

1.1 Main Control Malfunction

No. Error code Malfunction name
High pressure
1 E1
protection
2 E2 Freeze protection
Low pressure
protection
3 E3
Refrigerant lacking
protection
Refrigerant
recycling mode
Compressor high
4 E4 discharge temperature
protection
Communication
5 E6
malfunction
Malfunction of
6 E8
indoor fan motor
7 E9 Full water protection
Malfunction of indoor
8 F0 ambient temperature
sensor at air return port
Malfunction
9 F1 of evaporator
temperature sensor
Table 4-1-1 Fault Display on Indoor Wired Controller
Origin of
malfunction
signal
When outdoor unit detects the high pressure switch is cut off for 3s
successively, high pressure protection will occur. All the loads (except
High pressure the 4-way valve in heating mode) will be switched off. In this case, all
switch the buttons and remote control signals except ON/OFF button will be
disabled and cannot be recovered automatically. Switch off the unit or
re-energize the unit after cutting off power to eliminate this protection.
If detecting that the evaporator temperature is lower than protective
Indoor temp. value after the unit has been running for a period of time
evaporator under cooling or dry mode, the unit will report this fault, in which
temperature case the compressor and outdoor fan motor will be stopped. The
sensor unit will not run until evaporator temperature is higher than the
protective temp. value and the compressor is stopped for 3min.
If it is detected within 30s successively that the low-pressure
Low pressure switch is cut off under ON or standby state, the unit will report
switch low pressure protection. If the fault occurs successively 3 times
within 30min, the unit cannot be recovered automatically.
If the unit reports system refrigerant lacking within 10min after
turning on the unit, the unit will stop operation. If the fault occurs
successively 3 times, the unit cannot be recovered automatically.
If enter refrigerant recycling mode through special operation, E3 will be
displayed. After exiting refrigerant recycling mode, the code will disappear.
If outdoor unit detects that the discharge temperature is higher
Compressor
than protective temp. value, the unit will report high discharge
discharge
temperature protection. If the protection occurs over 6 times, the
temperature
unit cannot be recovered automatically. Switch off the unit or re-
is high
energize the unit after cutting off power to eliminate this protection.
Communication If the outdoor unit does not receive data from indoor unit,
between indoor communication malfunction will be reported. If there is
and outdoor communication abnormity between display board and indoor
mainboard unit, communication malfunction will be reported too.
If the indoor unit does not receive signal from indoor fan motor for
30s successively when the fan motor is operating, indoor fan motor
malfunction will be reported. In this case, the unit can automatically
Indoor fan motor
resume operation after stopping. If the malfunction occurs 6 times within
one hour, the unit cannot be recovered automatically. Switch off the unit
or re-energize the unit after cutting off power to eliminate this malfunction.
If cut-off of water level switch is detected for 8s successively once
Water level
energized, the system will enter full water protection. In this case,
switch
switch off the unit and then switch it on to eliminate this malfunction.
If the indoor ambient temperature sensor is detected of open circuit
or short circuit for 5s successively, indoor ambient temperature
Indoor ambient
sensor malfunction will be reported. The unit can automatically
temperature
resume operation after the malfunction disappears. If indoor ambient
sensor
temperature sensor malfunction occurs in fan mode, only the
error code is displayed and the indoor unit can work normally.
If the indoor evaporator temperature sensor is detected of open
circuit or short circuit for 5s successively, evaporator temperature
Evaporator
sensor malfunction will be reported. The unit can automatically
temperature
resume operation after the malfunction disappears. If evaporator
sensor
temperature sensor malfunction occurs in fan mode, only the
error code is displayed and the indoor unit can work normally.
U-Match Series DC
Inverter Service Manual
Control description
79