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. This switch connects to a sensing port via a small plastic or rubber tubing that samples the draft pressure near the draft inducer.
Understanding Furnace Pressure Switch Replacement Cost
Diagnostic Steps Begin by inspecting the air filter and verifying that supply and return vents are fully open, then check the vent pipe for blockages or ice buildup that could affect draft. Use a multimeter to measure the switch terminals while the inducer is running; a healthy switch will show continuity when the draft pressure is sufficient.
Regular maintenance, including annual professional service, helps keep the pressure switch and its tubing clean and functional. 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.
Understanding Furnace Pressure Switch Replacement Cost
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. 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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