When the refrigerant does not circulate

Condition: Air conditioning system does not function or functions intermittently.

Symptoms

Probable Causes

Diagnosis

Corrective Actions

• Vacuum indicated on low pressure side, and extremely low pressure indicated on high pressure side

• Frost or condensation seen on piping on both sides of condenser 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 expansion valve with compressed air

3. Replace condenser

4. Evacuate air and then supply appropriate volume of new refrigerant

5. For gas leakage from expansion valve, replace expansion valve

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