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+5% Tax • Shipping calculated at checkout.
U.S. Duties/Taxes, if applicable, may be due at time of delivery.
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
This premium Ignition Modulating Control Board Kit is a critical replacement component for residential heating and cooling systems. Designed to manage the complex ignition sequence and heat modulation of high-efficiency furnaces and package units, this circuit board ensures your HVAC system operates with precision and reliability. By regulating gas flow and timing the ignition spark, the board helps maintain consistent indoor temperatures and optimizes energy consumption. If your heating system is experiencing ignition failure, intermittent operation, or irregular heating cycles, this control board kit provides the necessary electronic oversight to restore peak performance and safety. It features advanced diagnostic capabilities to help troubleshoot system issues and maintain long-term HVAC health.
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
The 121-935 is a replacement part. Match your furnace model number on our site to confirm the fit. 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 (121-935) 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 121-935 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 121-935 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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