Installation And Maintenance - Gree GVA24AL-K3NNC7A/I Service Manual

Service Manual
2. High pressure protection (E1)
Are the display board and mainboard
Are the OVC terminal on the mainboard
connected well with the high pressure switch
Is the wiring of high pressure switch loosened? Is the high
pressure switch broken or poorly contacted?
Is the refrigerant superabundant?
Is there poor heat exchange? (Including filth
blockage of heat exchanger and bad radiating
Is the ambient temperature too high?
(If it is a 3-phase unit, high pressure protection may be caused
by overcurrent protection due to this)
Is the supply voltage normal? (If it is a 3-phase unit, high
pressure protection may be caused by overcurrent
intake and air discharge at indoor / outdoor heat
Is there filth blockage on the filter or on the
heat exchanger fins of indoor / outdoor unit?
Are the gas valve and liquid valve for
outdoor unit opened completely?

Installation and Maintenance

Start
connected tightly?
yes
on the complete unit ?
yes
no
no
environment )
no
no
protection due to this)
yes
Are the air
exchanger smooth?
yes
no
yes
Replace the mainboard
End
no
Connect the display board with the mainboard 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
The ambient temperature exceeds normal operation range;
yes
high pressure protection will occur once turning on the unit,
which is a normal phenomenon
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
no
Open the outdoor gas valve and liquid valve completely
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 eliminated.
45