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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
Ensure the safety and efficiency of your heating system with this 3-inch high limit switch. Designed as a critical thermal safety control, this component monitors the temperature within your furnace or HVAC unit to prevent overheating. The L180-40F switch acts as a vital failsafe, automatically opening the electrical circuit to shut down the heating cycle if the internal air temperature reaches a limit of 180 degrees Fahrenheit. Once the system cools down by 40 degrees to a safe reset temperature of 140 degrees Fahrenheit, the switch closes to allow normal operation to resume. This reliable replacement limit control is essential for protecting the heat exchanger and ensuring the longevity of residential and commercial forced-air systems.
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 543-181 is a genuine Carrier OEM part, sourced from an authorized Carrier parts distributor. This 3 Limit Switch 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 (543-181) with your furnace model number. Visit the homepage 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.
Most 3 Limit Switches including the 543-181 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. 3 Limit Switches orders are usually ready within 24 hours. Call us at 1-778-759-9864 to confirm the 543-181 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.
555 more not shown. Check your own model number above.
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