Refrigerant does not circulate

Symptom seen in refrigeration system

Probable cause

Diagnosis

Remedy

♦Vacuum indicated on low pressure side, very low pressure indicated on high pressure side ♦Frost or dew seen on piping before and after condenser/ drier or expansion valve

♦Refrigerant flow obstructed by moisture or dirt in refrigeration system

♦Refrigerant flow obstructed by gas leakage from expansion valve

Refrigerant does not circulate

(1) Check expansion valve

(2) Clean out dirt in expansion valve by blowing with air

(3) Replace condenser

(4) Evacuate air and charge new refrigerant to proper amount

(5) For gas leakage from expansion valve, replace expansion valve

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