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BCFurnace
3" HIGH LIMIT SWITCH L170-40F 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 L170-40F 3 High Limit Control Switches

BCFURNACE

543-170

CA$77.36

+5% Tax • Shipping calculated at checkout.

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

Name

3" HIGH LIMIT SWITCH L170-40F

5units available

Pickup available at 75 Blue Mountain St #3

Usually ready in 24 hours

Secure Payment
Fast Delivery
Local Pickup

Product Details

Description

This premium 3-inch high limit switch is a vital safety component designed for residential gas furnaces and HVAC heating systems. Functioning as a thermal cutout, this switch monitors the temperature within the heat exchanger to provide essential overheating protection. When the internal air temperature reaches a critical threshold of 170°F, the switch automatically interrupts power to the heating element or burner, preventing equipment damage and ensuring home safety. This reliable replacement part features an automatic reset with a 40°F differential, meaning it will restore system operation once temperatures have cooled to a safe level. Engineered for durability and precision, this furnace limit control is a common solution for systems experiencing cycling issues or safety shutdowns.

Specifications

Type
High Limit Control Switch
Size
3-inch insertion length
Application
Used in forced-air gas furnaces and HVAC heating units as a primary safety sensor to prevent overheating and equipment failure.
Specifications
Temperature Cut-out: 170°F; Temperature Differential: 40°F; Reset Type: Automatic; Mounting Style: Flange mount with 3-inch probe depth.

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Frequently Asked Questions

Is the 543-170 a genuine OEM part?
Yes, the 543-170 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 543-170 is compatible with my BCFurnace furnace?
The easiest way is to match the part number (543-170) 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 543-170 shipped?
Most 3 Limit Switches including the 543-170 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 543-170 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 543-170 is in stock before visiting.

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