GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
175
Troubleshooting:
E3 system low pressure
protection
Does the low pressure shown
on the pressure gauge reach the
protection value?
Is there enough refrigerant?
Check if stop valves
of the outdoor unit's fluid and air
tubes are fully opened.
Check if the outdoor unit is well
covered?
Check if intake and
exhaust outlets of indoor and
outdoor units are blocked.
Check if the fans of the indoor
and outdoor units work properly?
Check if the swing of the indoor
unit is fully opened?
Check if the capacity of IDU set by
the rated capacity DIP switch
exceeds the allowed value range?
Check if electronic expansion
valves of indoor and outdoor units
work properly?
Check if the return air filter of the
indoor unit is dirty or blocked?
The pipeline is blocked.
Clean the filter.
Replace electronic expansion
valves or main board.
Set the indoor unit's rating
capacity in the permitted range.
Check output signals of the
swing motor and main board.
Replace the swing motor or
main board.
Check the input signal of
the fans. Replace the
motor or main board.
Remove the
obstacle.
Re-install the panel.
Fully open the stop
valves.
The low pressure sensor fails,
Replace the pressure sensor
No
No
No
No
Yes
No
Yes
No
No
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Add refrigerant according to
the design and pipeline.
Check the pipeline, especially the
section between the outdoor unit and
the indoor unit's first branch pipe.
