High-efficiency condensing furnaces, which produce significant condensation, often have their pressure switch located lower on the unit to accommodate the drainage systems associated with the secondary heat exchanger. It is usually mounted using brackets and features between one and three ports (tubing connections) on its body.
Professional Help: Locating the Pressure Switch on Your Furnace
It is usually mounted near the top of the unit, close to where the inducer motor is located. 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.
If your furnace fails to ignite or stops heating unexpectedly, the culprit is often a safety mechanism designed to prevent dangerous operation. 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.
Where to Find the Furnace Pressure Switch on Your Unit
It is a small, often rectangular or cylindrical device with an electrical connector plugged into it. 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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