When a heat pump fails to produce heat in heating mode, the issue can stem from several common mechanical, electrical, or control configuration faults. A frequent culprit is a stuck reversing valve, which prevents the system from shifting its refrigerant flow cycle from cooling mode into heating mode. Another common cause is a malfunctioning defrost cycle, where ice buildup on the outdoor coil triggers a safety lockout or keeps the unit trapped in defrost mode, blowing lukewarm air. Additionally, a faulty thermostat setting, a tripped circuit breaker for the outdoor unit, low refrigerant levels, or a failed auxiliary heating strip can prevent proper warmth. You can verify the cause by checking outdoor coil icing, thermostat wiring, and airflow restrictions.
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