49
Installation and Maintenance
Service Manual
2. High pressure protection (E1)
Start
Are the display panel and main
board connected tightly?
Connect the display panel with the
main board well
Adjust the volume of refrigerant
according to the requirement of
the system
Adjust the unit to improve the heat
exchange of unit
Decrease the ambient temperature
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Remove the blockage.
Remove the blockage inside the
pipeline of the system
Open the outdoor gas valve and
liquid valve completely
Check the system further
The normal fluctuation is within 10%
of the rated voltage on the nameplate
Adjust the system to make the air
intake and air discharge of indoor
and outdoor heat exchangers smooth
Connect the OVC terminal on the
main board with the high pressure
switch on the complete unit well
If the wire of high pressure switch is
loosened, please connect the wires
according to the circuit diagram.
If the high pressure switch is broken
or poorly contacted,please replace it.
Is the refrigerant superabundant?
Is there poor heat exchange?
(Including filth blockage of heat
exchanger and bad radiating
environment );
Are the air intake and air discharge
at indoor / outdoor heat exchanger
smooth?
Is the supply voltage normal?
(If it is a 3-phase unit, high pressure
protection may be caused by
overcurrent protection due to this)
Is there filth blockage on the filter or
on the heat exchanger fins of indoor /
outdoor unit?
Is there blockage inside the
pipeline of the system
Are the gas valve and liquid valve for
outdoor unit opened completely?
Is the high pressure signal
at high level?
Replace the
controller
End
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)
Are the OVC terminal on the main
board connected well with the high
pressure switch on the complete
unit?
Is the wiring of high pressure
switch loosened? Is the high
pressure switch broken or poorly
contacted?
no
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
no
no
no
no
no
no
no
no
no
no
no
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
no
no
no
no
no
no
no
no
no
no
no
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