When a residential indoor air handler blower motor fails completely, your HVAC system loses its core ability to circulate conditioned air throughout your home's ductwork. Even though your outdoor air conditioning compressor or heating burners might attempt to operate, zero air will blow from your indoor supply registers, resulting in rapid indoor temperature discomfort—sweltering heat in summer or freezing cold in winter. Additionally, running the system with a failed blower motor can cause indoor coils to freeze solid into ice blocks or trigger electrical safety overloads, potentially blowing control fuses or tripping circuit breakers. You can troubleshoot by turning off power and inspecting motor capacitors and windings. You can verify that the blower motor has failed when confirmed line voltage reaches the unit, but the shaft refuses to turn, requiring replacement.
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