Installation And Maintenance - Gree GWH07AFA-K3NNA1A Service Manual

8. High pressure protection (E1)
Start
Are the display panel and main board
connected tightly?
yes
Are the OVC terminal on the main board connected
well with the high pressure switch on the complete
unit?
yes
Is the wiring of high pressure switch loosened? Is the high
pressure switch broken or poorly contacted?
no
Is the refrigerant superabundant?
no
Is there poor heat exchange? (Including filth
blockage of heat exchanger and bad radiating
environment );
no
Is the ambient temperature too high?
(If it is a 3-phase unit, high pressure protection may be
caused by over current protection due to this)
no
Is the supply voltage normal? (If it is a 3-phase unit, high
pressure protection may be caused by overcurrent
protection due to this)
yes
Are the air
intake and air discharge at indoor / outdoor heat
exchanger smooth?
yes
Is there filth blockage on the filter or on the
heat exchanger fins of indoor / outdoor unit?
no
Is there blockage inside the pipeline of the system
no
Are the gas valve and liquid valve for
outdoor unit opened completely?
yes
Is the high pressure signal
at high level?
yes
Replace the controller
End
52
no
Connect the display panel with the main board well
no
Connect the OVC terminal on the main board with the high
no
pressure switch on the complete unit well
no
If the wire of high pressure switch is loosened, please
connect the wires according to the circuit diagram.
yes
If the high pressure switch is broken or poorly contacted,
please replace it.
no
Adjust the volume of refrigerant according to the
yes
requirement of the system
no
yes
Adjust the unit to improve the heat exchange of unit
no
yes
Decrease the ambient temperature
no
The normal fluctuation is within 10% of the rated voltage on
no
the nameplate
no
Adjust the system to make the air intake and air discharge of
no
indoor and outdoor heat exchangers smooth
no
yes
Remove the blockage.
no
yes
Remove the blockage inside the pipeline of the system
no
no
Open the outdoor gas valve and liquid valve completely
no
no
Check the system further
no
Malfunction is eliminated.
yes
yes
Malfunction is eliminated.
Malfunction is eliminated. yes
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is removed.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.

Installation and Maintenance

Service Manual