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