NATE Heat Pump Service Practice Questions - NATE Air-to-Air Heat Pump Service Specialty Exam

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A heat pump runs constantly in heating but delivers only mildly warm air, and the outdoor coil is iced over while the reversing valve will not shift to defrost. The most likely cause is:

Faulty defrost control or sensor Oversized indoor blower Low thermostat heat anticipator Dirty condensate drain

Correct Answer:

Faulty defrost control or sensor

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