You will typically find it connected to two small plastic or metal tubes. If the switch detects that the pressure is too low—indicating a blockage, a leak in the venting, or a failing inducer motor—it will open the circuit, cutting power to the system and preventing a potential build-up of toxic gases like carbon monoxide.
Standard Furnace Pressure Switch Position
The tubing is usually clear or black plastic and can sometimes be brittle, so handling the component requires care to avoid cracking the ports. Variations in Older and High-Efficiency Models While the location is generally consistent, the specific configuration can vary depending on the furnace model and age.
This motor creates negative pressure in the heat exchanger, venting exhaust gases safely out of the home. One tube runs to the inducer motor to sense the pressure, while the other is vented to the outside or to the heat exchanger to compare the actual pressure against a set threshold.
Standard Furnace Pressure Switch Position
It is usually mounted using brackets and features between one and three ports (tubing connections) on its body. 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.
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