Maintenance; Trouble Table - Gree U-MATCH GUHD09NK3CO Service Manual

A/A DC INVERTER U-MATCH AIR CONDITIONERS

MAINTENANCE

1 TROUBLE TABLE

Table 1 Fault Display on Indoor Wired Controller:
Trouble Trouble
Code Name
Water Pump
E0
Malfunction
High Pressure
E1 Protection of
Compressor
Indoor
E2 Anti-frozen
Protetion
Low Pressure
E3 Protection of
Compressor
Air Discharge
High-temperatur
E4
e Protection of
Compressor
Overload
E5 Proection of
Compressor
Communication
E6
s Failure
Full Water
E9
Protection
Origin of
Trouble Signal
If the water-full protection cannot be recovered after 2 hours, it is
Water pump believed that the water pump is failed, in which case all the loads will
be switched off and cannot be recovered automatically.
When high pressure protection is detected for 3 seconds successively,
all the loads (except the heating 4-way valve) will be switched off, in
High-pressure which case all the keys and remote control signals except ON/OFF
Switch function will be disabled and cannot be recovered automatically. To
eliminate the fault, it is needed to switch off and on the machine or
recover from power failure.
If detecting that the evaporator sensor is lower than protective temp.
value after the unit has been running for a period of time under cooling
Indoor
or dry mode, the unit will report this fault, in which case the compressor
evaporator
and outdoor fan will be stopped. The unit will not run until this
sensor
temperature exits the pretective temperature value and the compressor
is stopped for 3 minutes.
If it is detected within 30 seconds successively that the low-pressure
switch is cut off under ON or standby state (If the compressor is started,
Low-pressure the detection will start 3 minutes after the compressor has run), the unit
Switch will report this fault. For the first two faults within 30 minutes, the unit
can be recovered automatically. If over three times, the unit cannot be
recovered automatically.
After the compressor is started, if it is detected within 30 seconds
successively that the exhaust temperature is 130
Exhaust displayed, in which case all the loads (except the 4-way valve of
Overtemperatur heating) will be stopped. The complete unit can only be recovered until
e Protection the compressor has stopped for 3 minutes and the exhaust
temperature is lower than 90 . For this protection occurs three times,
the complete unit cannot be recovered automatically.
After the unit is energized, if it is detected within 3 seconds
successively that the compressor overload switch is cut off, it will be
deemed compressor overload protection. In this case, all the loads will
be stopped (except the 4-way valve of heating) and E5 will be
displayed. If the fault is eliminated, the compressor will be restarted
after 3 minutes. If three compressor overload protections are detected
Compressor successively in 30 minutes from the first detection to the occurrence of
fault, the compressor cannot be recovered automatically and the
buzzer will alarm. You shall need to press ON/Off to stop the unit and
clear the sound alarm before pressing ON/OFF again. The unit will be
restarted if the high pressure protection disappears; otherwise the fault
code will be displayed. Besides, "E5" also will also be displayed on the
controller in the event of an error of the compressor drive module.
If the outdoor unit does not receive data from indoor unit for 30 seconds
successively once energized, this indicates indoor communication
failure. In this case, the compressor and outdoor fan will be stopped.
Under heating mode, the 4-way valve will be stopped if the compressor
Communication has been stopped for 2 minutes. If the indoor unit does not receive
between indoor message from outdoor unit for 1 minute, this indicates communication
and outdoor failure. In this case, the indoor unit will be stopped and the indicator will
mainboard blink. If the display board does not receive message from outdoor unit
in 1 minute, it can be judged that it is communication failure, in which
case the fault will be displayed and the machine will not function. After
the communication is resumed to normal, the system will run as per the
working mode before. This can recover automatically.
Liquid level
If "full water" is detected for 8 seconds successively once energized,
switch
the system will enter into full water protection and the indicator will blink
Control Description
℃
℃
MAINTENANCE
or higher, E4 will be
100