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Which outcome occurs when thermal expansion valve fails, restricting flow to HVAC evaporator?

A)Compressor overheating due to high discharge pressure
B)Reduced cooling capacity due to incomplete evaporation
C)Refrigerant flooding to the compressor suction line
D)Excessive frosting on the evaporator coil surface

💡 Explanation

When thermal expansion valve restricts the flow, the evaporator becomes starved of refrigerant; incomplete evaporation results because insufficient liquid is present to absorb the heat load. Therefore cooling capacity is reduced, rather than overpressure discharge, compressor flooding, or frosting which require different imbalances.

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