YES
Compressor
NO
Running?
YES
Line Voltage @
Control Board Compressor
Terminals
YES
Line Voltage At
Liquid Line Solenoid
NO
Valve?
YES
Low Pressure
NO
Control Closed?
YES
NO
Replace Control Board
Repair Wiring
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