![]() ![]() You’ll find the limit switch on top of the panel. To access it, reach below the ducts and open the panel. ![]() The limit switch is located in the furnace cabinet on a special panel beneath the heating ducts. Where is the Limit Switch Located on the Furnace? If it’s becoming too hot inside the house, the limit switch will request the furnace to cycle off to prevent overheating. During heating, the limit switch also stays on the watch to keep the temperatures within a safe level. If temperatures dip below a certain point, the limit switch, working alongside the thermostat, requests heating to keep you warm. It’s a small plate with arms that keeps furnace (and indoor) temperature limits, beyond which the switch can call for heating or shut off the furnace. The furnace limit switch is a safety mechanism built into modern furnaces to prevent overheating. What is a Limit Switch, and What Does it Do? ![]() Until then, the furnace will stay off.īelow we discuss what causes open limit switches, signs that you have an open limit switch, and what to do when your limit switch opens. If your furnace limit switch is open, you must manually fix the issue. Why would the switch open in the first place? And, even if it opens, shouldn’t it at least self-resolve when you restart the furnace? Although it doesn’t happen too often, it’s one of the most annoying things. If you’ve never run into a “limit switch open” issue with your furnace, you’re lucky. ![]()
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