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Furnace – Limit Switch | Repair and Replace

In this episode of Repair and Replace, Vance shows how to replace the high limit switch in a gas furnace. The limit switch is a safety switch that monitors the air passing over the heat exchanger and will shut the furnace off if the system overheats. If the high limit switch fails then the furnace might cycle on and off and will not function properly. The limit switch can be tested before replacing.

Buy limit switches online:

Learn how a furnace works:

If your furnace isn't working, then watch our troubleshooting guide:

More furnace repairs:


00:00 Intro
00:21 How it Works
00:52 What You'll Need
01:09 Step 1: Disconnect the Furnace
01:30 Step 2: Replace the Limit Switch
01:47 Step 3: Test the Limit Switch
02:27 Step 4: Replace the Limit Switch
02:43 Step 5: Reconnect the Furnace


AMRE Supply provides homeowners, service contractors, and property management with the parts and knowledge needed to get the best performance out of any property. Stocking the largest selection of appliance parts, heating, plumbing, lighting, and janitorial supplies, AMRE ships almost anywhere in Canada within 24 - 48 hours. Expert help is available online, over the phone or in person at one of the many locations across Canada.

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