It is usually mounted near the top of the unit, close to where the inducer motor is located. Typical Location on Modern Furnaces On the majority of modern gas furnaces, the pressure switch is situated on the side of the blower compartment.
How to Visually Identify the Pressure Switch on Your Furnace
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. Visual Identification Identifying the component visually is straightforward once you know what to look for.
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. Before assuming the switch is faulty, technicians must verify that the venting path is clear and that the motor is generating the correct pressure, as cleaning a vent or replacing a motor is a more common solution than replacing the switch.
How to Visually Identify the Pressure Switch on Your Furnace
If your furnace fails to ignite or stops heating unexpectedly, the culprit is often a safety mechanism designed to prevent dangerous operation. It is usually mounted using brackets and features between one and three ports (tubing connections) on its body.
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