CA
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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
Usually ready in 24 hours
Not sure this fits your furnace? Call us — we're happy to help
This high-quality Mercury Flame Sensor is an essential safety component for gas furnaces and HVAC heating systems. Designed to monitor the presence of a flame within the burner assembly, this sensor prevents hazardous gas accumulation by signaling the system to shut off the gas valve if no flame is detected during the ignition cycle. Common symptoms of a failing flame sensor include the furnace turning off shortly after lighting or failing to start altogether. This durable replacement part ensures your heating equipment operates efficiently and safely, providing reliable thermal detection and long-lasting performance in demanding high-heat environments.
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–9PM PST · Or email parts@bcfurnace.com
Compatible parts and related replacements
Yes, the 121-710 is a genuine OEM, or a factory replacement manufacturer approved part. We source all Flame Sensor Rods from authorized distributors to ensure exact-fit compatibility. This Flame Sensor Rod 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 (121-710) with your furnace model number. Visit the homepage and enter your model number in the search bar — our system will show all compatible Flame Sensor Rods for your specific unit. You can also call our technicians at 1-778-759-9864 for free compatibility verification.
Most Flame Sensor Rods including the 121-710 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. Flame Sensor Rods orders are usually ready within 24 hours. Call us at 1-778-759-9864 to confirm the 121-710 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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