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BCFurnace
3" HIGH LIMIT SWITCH L170-20F 3 High Limit Control Switches furnace part available in Vancouver, Burnaby, Port Moody, Langley, North Vancouver, Richmond, Maple Ridge, Delta, West Vancouver, New Westminster, Surrey, Coquitlam, Port Coquitlam, Pitt Meadows

3" HIGH LIMIT SWITCH L170-20F 3 High Limit Control Switches

BCFURNACE

543-009

CA$68.83

+5% Tax • Shipping calculated at checkout.

U.S. Duties/Taxes, if applicable, may be due at time of delivery.

Name

3" HIGH LIMIT SWITCH L170-20F

2units available

Pickup available at 75 Blue Mountain St #3

Usually ready in 24 hours

Secure Payment
Fast Delivery
Local Pickup

Product Details

Description

This 3-inch high limit switch is a vital safety component engineered for forced-air gas furnaces and HVAC heating systems. Acting as a thermal protection device, this switch monitors the temperature of the heat exchanger to prevent dangerous overheating conditions. If the air temperature reaches the safety threshold, the switch automatically opens to interrupt the heating cycle, protecting both the appliance and the home. This replacement part is designed for durability and precision, ensuring your furnace operates within safe thermal parameters. It is an essential component for DIY furnace repair and professional HVAC maintenance, helping to restore reliable and safe operation to your heating equipment.

Specifications

Type
High Limit Safety Control Switch
Size
3-inch insertion depth
Dimensions
3 inches (insertion probe)
Application
Used in residential gas furnaces, forced-air heating units, and HVAC systems to monitor heat exchanger temperatures and provide high-temperature cutout protection.
Specifications
Temperature Limit: 170°F (Open); Temperature Differential: 20°F (Resets at 150°F); Circuit: Single Pole Single Throw (SPST); Reset Type: Automatic.

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Frequently Asked Questions

Is the 543-009 a genuine OEM part?
Yes, the 543-009 is a genuine OEM replacement part manufactured by BCFurnace. We source all 3 Limit Switches from authorized distributors to ensure exact-fit compatibility. This 3 Limit Switches is backed by our 100% compatibility guarantee — if it doesn't fit your furnace, we'll make it right.
How do I know if the 543-009 is compatible with my BCFurnace furnace?
The easiest way is to match the part number (543-009) with your furnace model number. Visit the BCFurnace page on our site and enter your model number in the search bar — our system will show all compatible 3 Limit Switches for your specific unit. You can also call our technicians at 1-778-759-9864 for free compatibility verification.
How fast can I get the 543-009 shipped?
Most 3 Limit Switches including the 543-009 ship within 1–2 business days from our warehouse. We ship across Canada and the United States with tracking on every order. For urgent BCFurnace repairs, contact us at 1-778-759-9864 for expedited shipping options.
Can I pick up the 543-009 at your store?
Yes! Local pickup is available at our Coquitlam, BC location: 75 Blue Mountain St #3. 3 Limit Switches orders are usually ready within 24 hours. Call us at 1-778-759-9864 to confirm the 543-009 is in stock before visiting.

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