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. This motor creates negative pressure in the heat exchanger, venting exhaust gases safely out of the home.
Common Blockage Indicators and Pressure Switch Location on Furnaces
A clogged flue pipe, a cracked heat exchanger, or a failing inducer motor can all cause the switch to trip. Understanding the Role of the Pressure Switch The pressure switch is not a component that generates heat or directly controls the flame; rather, it is a safety sensor.
Typical Location on Modern Furnaces On the majority of modern gas furnaces, the pressure switch is situated on the side of the blower compartment. The tubing is usually clear or black plastic and can sometimes be brittle, so handling the component requires care to avoid cracking the ports.
Identifying Blockage Indicators on Your Pressure Switch
In older units, the pressure switch might be mounted vertically on the combustion chamber or located near the bottom of the unit. 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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