Gree GMV-VQ680WM/C-X Service Manual page 140

Gree
Is there too little refrigerant in the
valves of liquid pipes and gas pipes
Whether the panel of the outdoor
and outlet of the indoor and outdoor
capacity of the indoor units dialed
Is the air return filter of the indoor
"E3" System Low Pressure
Protection
Does the low
pressure (measured by the
pressure gauge) reach the
protection value?
Yes
system?
No
Whether the check
of the outdoor unit are fully
opened?
Yes
unit is fully closed?
Yes
Whether the air inlet
units are blocked?
No
Whether the indoor units,
outdoor units and fans
work properly?
Yes
Whether the air guide louver
of the indoor unit is
fully open?
Yes
Is the DIP switch for the rated
out of range?
Yes
Do the indoor and outdoor
electronic expansion valves
work properly?
Yes
unit clogged with dirt?
No
The unit pipes are
clogged
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No
A fault occurs in the low
pressure sensor.
Replace the pressure sensor
Yes
Add the refrigerant by the
amount as required by the
design and the pipes.
No
Fully open the check
valve
No
Properly cover the
panel
Yes
Remove the clog
No
Check the input signal of
the fan, and replace the
motor or the main board
Check the input signal of
No
the swing motor and the
main board, and replace
the swing motor or the
main board
Yes
Set the rated capacity of the
indoor unit within the allowable
range
No
Replace the electronic
expansion valve or the main
board
Yes
Clean the filter
Check the pipes, especially the pipe
connecting the outdoor unit and the first
indoor branch joint
138