37
Installation and Maintenance
Service Manual
6. Low pressure protection of compressor (E3)
Start
Is the terminal
of low pressure switch
inserted well?
Re-insert it tightly
to ensure reliable
contact.
Is the
malfunction
eliminated?
Is the
higher than the acting
value of the low pressure
switch?
Add refrigerant.
Is the
malfunction
eliminated?
Test when denergized:
a closed circuit between the two
terminals led out from
Replace the low
pressure switch.
Is the
malfunction
eliminated?
The controller is
defined
abnormal;
replace it.
No
Yes
No
No
Yes
No
No
Yes
End
No
Yes
Yes
Yes
Yes
