This switch connects to a sensing port via a small plastic or rubber tubing that samples the draft pressure near the draft inducer. 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.
Common Signs and Diagnostic Steps for a Faulty Pressure Switch
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. 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.
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. This not only reduces comfort by creating temperature swings but also increases wear on the blower motor and other components.
Common Signs and Diagnostic Steps for a Faulty Pressure Switch
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. Impact on System Performance A malfunctioning pressure switch can lead to short cycling, where the furnace starts and stops repeatedly without completing a full heat cycle.
More About What happens when a furnace pressure switch goes bad
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