Gree GVH48AH-M3DNA5A Service Manual page 37

"E3" is
displayed on
the unit.
Is the terminal
of low pressure switch
inserted well?
Yes
No
Is the
system pressure
higher than the acting
value of the low pressure
switch?
No
No
Test when denergized:
is it a closed circuit between the two
terminals led out from
the switch?
Yes
No
The controller is
defined abnormal;
replace it.
End
Re-insert it tightly
No to ensure reliable
contact.
Is the
malfunction
eliminated?
Yes Add refrigerant.
Is the
malfunction
eliminated?
Replace the low
No
pressure switch.
Is the
malfunction
eliminated?
Yes
Yes
Yes
Yes