"E3" System Low Pressure
Protection
Does the low
pressure (measured by the
pressure gauge) reach the
protection value?
Is there too little refrigerant in the
system?
Whether the check
valves of liquid pipes and gas pipes
of the outdoor unit are fully
opened?
Whether the panel of the outdoor
unit is fully closed?
Whether the air inlet
and outlet of the indoor and outdoor
units are blocked?
Whether the indoor units,
outdoor units and fans
work properly?
Whether the air guide louver
of the indoor unit is
fully open?
Is the DIP switch for the rated
capacity of the indoor units dialed
out of range?
Do the indoor and outdoor
electronic expansion valves
work properly?
Is the air return filter of the indoor
unit clogged with dirt?
The unit pipes are
clogged
Clean the filter
Replace the electronic
expansion valve or the main
board
Set the rated capacity of the
indoor unit within the allowable
range
Check the input signal of
the swing motor and the
main board, and replace
the swing motor or the
main board
Check the input signal of
the fan, and replace the
motor or the main board
Remove the clog
Properly cover the
panel
Fully open the check
valve
A fault occurs in the low
pressure sensor.
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 the refrigerant by the
amount as required by the
design and the pipes.
Check the pipes, especially the pipe
connecting the outdoor unit and the first
indoor branch joint
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