In older units, the pressure switch might be mounted vertically on the combustion chamber or located near the bottom of the unit. 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.
Pressure Switch Location in the Furnace Blower Compartment
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. 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.
The tubing is usually clear or black plastic and can sometimes be brittle, so handling the component requires care to avoid cracking the ports. If your furnace fails to ignite or stops heating unexpectedly, the culprit is often a safety mechanism designed to prevent dangerous operation.
Pressure Switch Location in the Furnace Blower Compartment
Visual Identification Identifying the component visually is straightforward once you know what to look for. It is usually mounted near the top of the unit, close to where the inducer motor is located.
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