Gree GMV6 DC Inverter VRF Units Service Manual
108
E1 System Overpressure
Protection
Whether the
high pressure of the unit
(measured by the external
pressure gauge system) is
above 4.2 MPa?
Whether the
high pressure sensor is
normal?
Whether the check
valve of the outdoor unit
is fully open?
Whether the outdoor unit's
panel is fully closed?
Whether the air
inlet or return pipes for indoor
and outdoor units are short
circuited or blocked?
Whether the indoor
units, outdoor units and fans
work properly?
Whether the
air guide louver of the indoor
unit is fully open?
Whether the
indoor and outdoor
electronic expansion valves
work properly?
Whether the indoor and
outdoor fins are dirty or
blocked?
Clean the fins
Check the electronic expansion
valve and the main board
Check the swing motor and
input signal
Replace the main control
board
Clean the pipes to avoid s hort
circuit
Reinstall the outdoor unit's
panel
Fully open the check valve
of the outdoor unit
Whether the high pressure
switch operates properly?
Replace the main board of
outdoor unit
Replace the high pressure
switch
Yes
No
No
No
No
No
No
No
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Replace the pressure
sensor
Replace the main board of
outdoor unit
Whether the outdoor
ambient temperature
exceeds 50 degrees?
No
System protection enabled and
no special care required
Yes
Yes
Whether the fan input
signal is normal?
Replace the motor
No
Yes
Are the pipes clogged?
Re-weld the pipes
Yes
No
Excessive
refrigerant in the
unit
Remove the refrigerant for 1 kg each time, keep
the unit running for 1.5 hours and then observe
whether the system protection is enabled.
Repeat the operations above until no system
protection is triggered
Summary of Contents for GMV6 Series
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