Are the service valves fully open?
YES
YES
YES
Are the characteristics of the low
pressure transmitter and sensor
for suction gas temperature OK?
Is the low pressure normal during
operation?
Defective control board - replace.
Open the service valves.
Action.
Are the connections to the low
pressure transmitter and sensor
for suction gas temperature OK?
Defective low pressure transmitter
or sensor for suction gas
temperature - replace.
Top up refrigerant.
NO
NO
NO
NO
Cont'd from
previous page
YES
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