To verify this symptom, observe the furnace behavior when the thermostat is set to heat mode. Confirm that the blower motor is actively pushing air through the floor or ceiling vents. If the air coming from the vents is room temperature rather than warm, and the blower remains running while the burners or heating elements fail to engage, the system is in a state of failed heating output. Check the integrated furnace control (IFC) board status LED for active error codes.
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