YORK/ETC PRESSURE SWITCH 0.20" WC / 0.40" WC Air Pressure Switch, Air Proving
+5% Tax • Shipping calculated at checkout.
U.S. Duties/Taxes, if applicable, may be due at time of delivery.
Not sure this fits your furnace? Call us — we're happy to help
This premium air pressure switch is an essential safety component for modern HVAC systems and gas furnaces. Functioning as an air proving sensor, it monitors the pressure differential created by the draft inducer motor to ensure proper venting before the ignition process begins. By detecting precise pressure levels, this switch prevents the furnace from operating under unsafe conditions, such as blocked flues or motor failure. If your heating system is cycling incorrectly or failing to ignite, replacing a worn or faulty pressure switch can restore safe and efficient operation. Designed for high reliability, this dual-setting switch provides accurate sensing for residential and commercial heating equipment.
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 773-385 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 (773-385) 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 773-385 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 773-385 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.
137 more not shown. Check your own model number above.
Looking for more Air Pressure Switches?
