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64 Part Number 000015433_03 5/20
Low Pressure
Control Closed?
Line Voltage At
Liquid Line Solenoid
Valve?
NO
NO
YES
Verify:
Refrigerant Pressure is Higher Than
LPCO Cut-in
Both Shut-off Valves are Open
Repair/Replace Liquid Line Solenoid
Locate and Repair Refrigerant Leak
Replace LPCO Switch
Replace Relay
YES
High Pressure
Control Closed?
NO Resets?
Replace HPCO
Clean Condenser,
Check Fan Motor
Check Fan Cycle Control
Refrigerant Pressure
Above Cut-out?
Clean Condenser,
Check Fan Motor,
Check Fan Cycle Control &
Refrigeration System
Resets
&
Trips
NO NO
YES
NO
Line Voltage To
Compressor
Contactor Coil?
YES
YES
YES
Repair Wiring
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