Maintenance; Trouble Table - GREE ELECTRIC GUHD09NK3CO Service Manual

U-Match Series DC
Inverter Service Manual

MAINTENANCE

1 TROUBLE TABLE

Table 1 Fault Display on Indoor Wired Controller:
Trouble
Trouble
Code
Water Pump
E0
Malfunction
High Pressure
E1 Protection of
Compressor
Indoor Anti-
E2
frozen Protetion
Low Pressure
E3 Protection of
Compressor
Air Discharge
High-temperature
E4
Protection of
Compressor
Compressor
E5 Overload or drive
Communications
E6
Full Water
E9
Protection
101
Origin of
Name Trouble Signal
Water pump
High-pressure
Switch
Indoor evaporator
sensor
Low-pressure
Switch
Exhaust
Overtemperature
Protection
Compressor
error
Communication
between indoor
Failure and outdoor
mainboard
Liquid level
switch
If the water-full protection cannot be recovered after 2 hours, it is 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 which case all the keys
and remote control signals except ON/OFF 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 or dry mode, the unit will
report this fault, in which case the compressor and outdoor fan will be stopped. The
unit will not run until this 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, the detection will start
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
all the loads (except the 4-way valve of heating) will be stopped. The complete
unit can only be recovered until the compressor has stopped for 3 minutes and the
exhaust temperature is lower than 90
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 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 has been stopped for 2 minutes.
If the indoor unit does not receive message from outdoor unit for 1 minute, this
indicates communication failure. In this case, the indoor unit will be stopped and
the indicator will 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.
If "full water" is detected for 8 seconds successively once energized, the system
will enter into full water protection and the indicator will blink (or display E9):
Under cooling and dry mode, the outdoor fan and compressor will be stopped,
while the indoor fan will be stopped after 1 minute. Under heating mode, the
outdoor fan and compressor will be stopped, the 4-way valve will maintain its
original state, and the indoor unit will be stopped after 1 minute. Under fan mode,
the indoor loads will not be stopped.
Control Description
°C or higher, E4 will be displayed, in which case
°C
. For this protection occurs three times, the