Check the tubing for cracks, holes, or disconnections, as a leak here is a common cause of false pressure switch failures. Blockages in the flue vent, a failing inducer motor, or a clogged air filter can prevent the switch from sensing the proper airflow.
Furnace Pressure Switch Testing Guide: Step-by-Step Inspection and Troubleshooting
Addressing these airflow issues often resolves the problem without needing to replace the switch. Locate the unit's disconnect switch near the unit itself and ensure it is also turned off.
Also, examine the venting outside your home to ensure it is not clogged with snow, leaves, or bird nests, which can create excessive backpressure. Locate the switch, which is usually a small, rectangular device with electrical wires connected to the back and a rubber or plastic tubing connecting to the inducer motor housing.
How to Test the Furnace Pressure Switch for Proper Function
To check for blockages, inspect the vent pipe running to the exterior of your home. First, disconnect the two wires connected to the switch terminals.
More About How to check a furnace pressure switch
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