• POA, STV, or EXP valve malfunction
• Moisture in receiver drier
• Restriction of air flow to condenser
• Thermostat failure
• Low oil charge
• High or low head pressure
• POA, STV, or EXP valve malfunction
• Moisture in receiver drier
• Restriction of air flow to condenser
• Thermostat failure
• Low oil charge
• High or low head pressure