Which outcome occurs when thermal expansion valve (TXV) in an HVAC system fails shut?

💡 Explanation

When the TXV fails shut, refrigerant flow to the evaporator is restricted, because this starves the upstream compressor, resulting in rising discharge temperature and consequent overheating/damage due to insufficient cooling of the compressor. Therefore compressor overheat results, rather than evaporator freeze, condenser pressure drop, or liquid flood: each requires different refrigerant flows.

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