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THE CAUSE MAY BE: 1. Moisture - Water or a mixture of water and oil frozen in the valve port or working parts of the valve will prevent proper operation. 2. Dirt or fo ... Voir Plus
Be specific. What kind of expansion valve you're asking. Electronic or Thermostatic? Because in some instances the one controlling the operation of expansion valve h ... Voir Plus
1. Low Refrigerant Charge: A system that is low on refrigerant will have ice or frost on the valve. Check the sight glass. Also listen for a hissing noise coming from the ... Voir Plus