It is usually mounted near the top of the unit, close to where the inducer motor is located. It is a small, often rectangular or cylindrical device with an electrical connector plugged into it.
Common Causes of Furnace Pressure Switch Tripping and Location Tips
Locating this component is the first step in diagnosing many common furnace issues, and understanding its role helps clarify why it shuts down the unit when problems arise. A clogged flue pipe, a cracked heat exchanger, or a failing inducer motor can all cause the switch to trip.
Furnace Type Typical Pressure Switch Location Number of Tubes Standard Efficiency (80% AFUE) Top or side of the blower compartment Two (Inducer and Venting) High Efficiency (90%+ AFUE) Lower front or side of the unit Three (Inducer, Venting, and Drain) Old/Masonry Furnaces Near the combustion chamber or rear One or Two Common Issues Related to the Switch Because the pressure switch is directly linked to the inducer motor and the venting system, issues often stem from related components rather than the switch itself. This motor creates negative pressure in the heat exchanger, venting exhaust gases safely out of the home.
Identifying Pressure Switch Location for Venting Problems
Safety and Professional Intervention. It is usually mounted using brackets and features between one and three ports (tubing connections) on its body.
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