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HVAC Blowers & Motors - Parts & Accessories - Limit Controls, Temp Switches & Timers

Limit switches in HVAC systems are temperature-sensitive safety devices (often bimetallic or thermal cutoff types) that monitor internal temperatures and open or close electrical circuits to prevent overheating or control component operation. In gas furnaces, the primary high-limit switch shuts off the burners and gas valve if the heat exchanger or plenum exceeds safe temperatures (e.g., due to restricted airflow, dirty filters, or blower failure), while a fan-limit switch (or auxiliary limit) activates the blower once the heat exchanger reaches a set temperature for efficient air distribution and turns it off after cooling to avoid blowing cold air.

Additional types include rollout limit switches (which detect flame rollout outside the burners for extra safety) and manual-reset versions that require intervention after tripping, ensuring protection against fire hazards, equipment damage, or unsafe conditions; in electric furnaces or air handlers with heat strips, similar limit switches protect against overheating of heating elements.

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Need help finding the correct blower or fan kit for your fireplace? Let our experts help you track down the correct replacement blower, fan kit or part for your application. We typically only need the fireplace or stove's make and model to determine exactly what you need. This information can usually be found on gas fireplaces by removing the lower access panel and finding your fireplace's name tag or identificaton card. Wood inserts will often times have the same identificaton card, while freestanding stoves and others might have this information printed on a rear panel or door.

Once you've located your fireplace's brand and model information, simply use the Find Your Blower tool above, or the Help Find My Blower at the top of the page.

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