+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 high-performance Ignition Modulating Control Board serves as the central processing unit for residential heating and cooling systems. Designed to regulate the ignition sequence and manage airflow modulation, this circuit board ensures your HVAC unit operates at peak efficiency. It coordinates complex sequences of operation, including timing for gas valves, blower speeds, and critical safety checks to prevent system overheating. If your furnace or air conditioner is failing to start, experiencing erratic cycles, or displaying diagnostic error codes, a faulty control board is often the culprit. This durable electronic module is engineered for precision control, helping to maintain consistent indoor temperatures while optimizing energy consumption through advanced modulating technology.
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 121-443 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 (121-443) 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 121-443 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 121-443 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.
25 more not shown. Check your own model number above.
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