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Pickup available at 75 Blue Mountain St #3, Coquitlam
Usually ready in 24 hours
Not sure this fits your furnace? Call us — we're happy to help
Ensure your heating system operates safely and efficiently with this high-quality Air Pressure Switch. Designed as a critical safety component for residential gas furnaces, this air proving switch monitors the draft pressure created by the inducer motor. By verifying that the combustion blower is operating correctly and the exhaust vent is unobstructed, it allows the ignition sequence to proceed. If your furnace is failing to ignite or cycling incorrectly, this reliable replacement part is essential for restoring consistent performance and maintaining home comfort. Crafted for precision and durability, it helps prevent hazardous conditions by ensuring proper airflow before the gas valve is permitted to open.
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 773-317 is a genuine Lennox OEM part, sourced from an authorized Lennox parts distributor. 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 (773-317) 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 773-317 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 773-317 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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