This switch connects to a sensing port via a small plastic or rubber tubing that samples the draft pressure near the draft inducer. If the meter shows no continuity despite adequate airflow, the switch is likely faulty and should be replaced with a manufacturer-specified component.
Essential Tips to Prevent Furnace Pressure Switch Failures
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. 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.
Replacement and Reset Procedure Replacing a pressure switch typically involves turning off power and gas, disconnecting the wiring and the vacuum tubing, and installing a new unit with the same pressure rating and electrical specifications. You might hear rapid attempts to start the system, followed by a lockout, often accompanied by a flashing LED or an error code displayed on the digital thermostat.
Tips to Avoid Furnace Pressure Switch Failures
Regular maintenance, including annual professional service, helps keep the pressure switch and its tubing clean and functional. 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.
More About What happens when a furnace pressure switch goes bad
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