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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
The Simplicity 1A Control Board is a high-performance ignition modulating circuit board designed to serve as the central processing hub for multi-stage heating and cooling systems. This 2/4 stage control module manages critical HVAC operations, including burner ignition sequences, fan speed timing, and precise temperature modulation. It is an essential replacement part for restoring efficiency and reliability to commercial rooftop units and high-capacity furnaces that are experiencing ignition failure, intermittent cycling, or diagnostic errors. Built with advanced circuitry, this board ensures seamless transitions between stages, protecting your equipment from mechanical stress while maintaining consistent indoor climate control and energy efficiency.
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 121-104 is a genuine York OEM part, sourced from an authorized York parts distributor. This Control Board 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 (121-104) with your furnace model number. Visit the homepage and enter your model number in the search bar — our system will show all compatible Control Boards for your specific unit. You can also call our technicians at 1-778-759-9864 for free compatibility verification.
Most Control Boards including the 121-104 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. Control Boards orders are usually ready within 24 hours. Call us at 1-778-759-9864 to confirm the 121-104 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.
358 more not shown. Check your own model number above.
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