LENNOX PRESSURE SWITCH 2-STG 0.15" WC / 0.83" WC Air Pressure Switch, Air Proving
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Pickup available at 75 Blue Mountain St #3
Usually ready in 24 hours
Not sure this fits your furnace? Call us — we're happy to help
Ensure the safe and efficient operation of your heating system with this premium dual-stage air pressure switch. Designed as a critical safety mechanism for high-efficiency gas furnaces, this air proving switch monitors the airflow and pressure created by the draft inducer motor. It confirms that the system is venting exhaust gases correctly before allowing the furnace to ignite, preventing hazardous conditions. This specific component is engineered for two-stage heating units, featuring precisely calibrated set points of 0.15" WC and 0.83" WC to manage varying blower speeds. If your furnace is experiencing ignition failure, error codes, or intermittent cycling, replacing a worn or faulty pressure switch can restore reliable performance and consistent home comfort.
Our team is happy to help you verify compatibility before you order. We'll confirm it fits your specific furnace model.
1-778-759-9864Mon–Sat 8AM–5PM PT · Or email parts@bcfurnace.com
Compatible parts and related replacements
Yes, the 773-040 is a genuine OEM, or a factory replacement manufacturer approved part. We source all Air Pressure Switches from authorized distributors to ensure exact-fit compatibility. This Air Pressure Switch is backed by our 100% compatibility guarantee — if it doesn't fit your furnace, we'll make it right.
The easiest way is to match the part number (773-040) with your furnace model number. Visit the homepage and enter your model number in the search bar — our system will show all compatible Air Pressure Switches for your specific unit. You can also call our technicians at 1-778-759-9864 for free compatibility verification.
Most Air Pressure Switches including the 773-040 ship within 1–2 business days from our warehouse. We ship across Canada and the United States, and worldwide, with tracking on every order. For urgent furnace repairs, contact us at 1-778-759-9864 for expedited shipping options.
Yes! Local pickup is available at our Coquitlam, BC location: 75 Blue Mountain St #3. Air Pressure Switches orders are usually ready within 24 hours. Call us at 1-778-759-9864 to confirm the 773-040 is in stock before visiting.
Still not sure this is the right part? Call 1-778-759-9864 and we will check your model number with you.
The model number is on the rating plate inside the furnace door.
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