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Refrigeration Diagnosis
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Refrigeration System Diagnosis
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Overcharge of refrigerant
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• Shortage of refrigerant
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• No refrigerant
Air through condenser too hot (ambient)
Air flow through condenser restricted
Air through condenser too cold (ambient)
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Air in refrigerant system
Condenser fan blades bent or broken
Air short cycling around evaporator coil
Air through evaporator restricted
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Evaporator needs defrosting
Compressor discharge valves leaking
Compressor suction valves leaking
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Too much compressor oil in system
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Faulty oil pump in compressor
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Loose compressor pulley
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Compressor bearing loose or burned out
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Broken valve plate in compressor
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Expansion valve power element lost its charge
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Expansion valve feeler bulb improperly mounted
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Expansion valve feeler bulb making poor contact
Expansion valve open too much
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Expansion valve closed too much
Expansion valve needle eroded or leaking
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Expansion valve partially closed by ice, dirt or wax
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Liquid refrigerant entering compressor
Restricted line on the low side
Possible Causes
15-2
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