When the pressure meets or exceeds the factory-set threshold, the switch closes its contacts and signals the control board that it is safe to proceed with ignition. This small but critical component acts as a guardian, ensuring the blower and inducer motor create enough draft for proper exhaust before allowing the main burners to ignite.
Understanding Blocked Vent Furnace Pressure Switch Symptoms and Solutions
This not only reduces comfort by creating temperature swings but also increases wear on the blower motor and other components. 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.
During tune-ups, technicians can blow out debris from the venting system, inspect the draft inducer, and check the switch for signs of fatigue or delayed response. Because these symptoms overlap with other issues, such as a clogged filter or blocked vent, a systematic diagnostic approach is essential to confirm the pressure switch as the root cause.
How a Blocked Vent Triggers Furnace Pressure Switch Failure
Regular maintenance, including annual professional service, helps keep the pressure switch and its tubing clean and functional. Many modern systems require a manual reset on the control board or a cycle of the thermostat before the furnace will restart, so follow the manufacturer’s guidance to ensure proper operation.
More About What happens when a furnace pressure switch goes bad
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