SPDT VENT DAMPER DOOR SWITCH FOR G20 125/250VAC, 427-132
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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
This SPDT Vent Damper Door Switch is an essential safety and operational component for residential and commercial gas heating systems. Functioning as a Single Pole Double Throw (SPDT) mechanism, this switch ensures that the appliance's vent damper is correctly positioned before allowing the heating cycle to proceed. It plays a critical role in preventing the ignition of the furnace or boiler if exhaust gases cannot be safely vented, protecting your home or building from carbon monoxide backup. Designed to handle 125/250VAC electrical loads, this durable metal venting switch is a common replacement part for gas furnaces and HVAC units experiencing ignition failure or intermittent operation. Its reliable contact action provides accurate signaling to the control board, ensuring efficient and safe appliance performance.
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 427-608 is a genuine OEM, or a factory replacement manufacturer approved part. We source all Gas Controls from authorized distributors to ensure exact-fit compatibility. This Gas Control 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 (427-608) with your furnace model number. Visit the homepage and enter your model number in the search bar — our system will show all compatible Gas Controls for your specific unit. You can also call our technicians at 1-778-759-9864 for free compatibility verification.
Most Gas Controls including the 427-608 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. Gas Controls orders are usually ready within 24 hours. Call us at 1-778-759-9864 to confirm the 427-608 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.
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