Dirt, soot, or moisture in the flue gases can also clog the sensing port or tubing, causing the switch to open even when the draft is adequate. This not only reduces comfort by creating temperature swings but also increases wear on the blower motor and other components.
Inducer Motor Pressure Switch Issues and What Happens When It Fails
If the meter shows no continuity despite adequate airflow, the switch is likely faulty and should be replaced with a manufacturer-specified component. How the Pressure Switch Protects Your Furnace Modern gas furnaces rely on a pressure switch to monitor the strength of airflow generated by the inducer motor.
If the switch fails open or cannot reach the set point, the furnace enters a lockout state and the error code, if equipped, often points to an issue with pressure or venting. This switch connects to a sensing port via a small plastic or rubber tubing that samples the draft pressure near the draft inducer.
Inducer Motor Pressure Switch Issues and Their Impact on Furnace Performance
When your furnace pressure switch goes bad, the system can no longer verify that the flue is clear and vents are functioning, which triggers a safety shutdown to prevent dangerous carbon monoxide buildup. Symptoms of a Faulty Pressure Switch One of the most telling signs is a furnace that clicks on the thermostat but never proceeds beyond the initial startup sequence, with the inducer motor running briefly then shutting down.
More About What happens when a furnace pressure switch goes bad
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