Gree GWC36LB-D1NNA2A/I Service Manual page 47

Troubleshooting for low pressure protection of compressor (E3)
Malfunction diagnosis flowchart:
Check whether the
main board and display board is
connected tightly?
Check whether the
LPP terminal on main board is connected well
with the low pressure switch on the
Check whether the wire
of low presure switch is loosened? whether
the low pressure switch is damaged
Refrigerant is insufficient
Check whether the LPP input is
high level?
Replace the control
board
44
Start
yes
complete unit
yes
or poor connected?
no
yes
no
yes
End
Connect them
no
correctly
no
Please confirm that
they are connected
well
no
Make sure that the
wires are connected
yes
well and the switch
is normal
no
Recharge the
refrigerant according
to requirement
no
De-energize the
no
unit and then restart
the unit
no
Eliminate the
yes
malfunction
Eliminate the
yes
malfunction
Eliminate the
yes
malfunction
Eliminate the
yes
malfunction
Eliminate the
yes
malfunction
Troubleshooting