Refrigerant does not circulate

Symptom seen in refrigeration system

Probable cause

Diagnosis

Remedy

CVacuum indicated on low pressure side, very low pressure indicated on high pressure side CFrost or dew seen on piping before and after receiver/ drier or expansion valve

CRefrigerant flow obstructed by moisture or dirt in refrigeration system

CRefrigerant 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

If not able to remove dirt, replace expansion valve

(3) Replace receiver

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

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

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