Gree U-match Series

U-Match Series DC Inverter Service Manual
81
MAINTENANCE
1 TROUBLE TABLE
1.1 Main Control Malfunction
Table 1 Fault Display on Indoor Wired Controller
No.
Error code
Malfunction
name
Origin of
malfunction
signal
Control description
1
E1
High pressure
protection
High pressure
switch
When outdoor unit detects the high pressure switch is cut off
for 3s successively, high pressure protection will occur. All the
loads (except the 4-way valve in heating mode) will be
switched off. In this case, all 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.
2
E2
Freeze
protection
Indoor
evaporator
temperature
sensor
If detecting that the evaporator temperature is lower than
protective temp. Value after the unit has been running for a
period of time under cooling or dry mode, the unit will report
this fault, in which case the compressor and outdoor fan
motor will be stopped. The unit will not run until evaporator
temperature is higher than the protective temp. value and the
compressor is stopped for 3min.
3
E3
Low pressure
protection
Low pressure
switch
If it is detected within 30s successively that the low-pressure
switch is cut off under ON or standby state, the unit will report
low pressure protection. If the fault occurs successively 3
times within 30min, the unit cannot be recovered
automatically.
Refrigerant
lacking
protection
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.
Refrigerant
recycling mode
If enter refrigerant recycling mode through special operation,
E3 will be displayed. After exiting refrigerant recycling mode,
the code will disappear.
4
E4
Compressor
high discharge
temperature
protection
Compressor
discharge
temperature is
high
If outdoor unit detects that the discharge temperature is
higher than protective temp. Value, the unit will report high
discharge temperature protection. If the protection occurs
over 6 times, the unit cannot be recovered automatically.
Switch off the unit or re-energize the unit after cutting off
power to eliminate this protection.
6
E6
Communication
malfunction
Communication
between indoor
and outdoor
mainboard
If the outdoor unit does not receive data from indoor unit,
communication malfunction will be reported. If there is
communication abnormity between display board and indoor
unit, communication malfunction will be reported too.
8
E8
Malfunction of
indoor fan motor
Indoor fan
motor
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 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.
9
E9
Full water
protection
Water level
switch
If cut-off of water level switch is detected for 8s successively
once energized, the system will enter full water protection. In
this case, switch off the unit and then switch it on to eliminate
this malfunction.
10
F0
Malfunction of
indoor ambient
temperature
sensor at air
return port
Indoor ambient
temperature
sensor
If the indoor ambient temperature sensor is detected of open
circuit or short circuit for 5s successively, indoor ambient
temperature sensor malfunction will be reported. The unit can
automatically resume operation after the malfunction
disappears. If indoor ambient temperature sensor
malfunction occurs in fan mode, only the error code is
displayed and the indoor unit can work normally.