In most cases, the limit switch will be located inside the cover panel of your furnace. It attaches to a long temperature probe that extends through the furnace housing. The first is a small button-shaped mounting plate that’s fastened outside of the furnace plenum. What does a furnace limit switch look like?Ī furnace limit switch has two components. If a gas furnace warms your home, install a carbon monoxide alarm to detect the odorless gas in case of a leak. It does this by shutting off power to the gas valve when the furnace exceeds the manufacturer’s temperature limit. If those safety components fail, necessary parts of the furnace, like the heat exchanger, can break more easily.įortunately, your switch acts as a safety device to control these variables and keep your family safe. Since your furnace uses gas to heat your home, it must have safety features in place to prevent it from overheating or breaking.
How a furnace limit switch impacts your safety and comfort When the furnace’s internal temperature decreases, the limit switch will close, allowing the furnace to start back up for normal operation. The burners will shut down and the fan will continue to operate, cooling down the internal components of the furnace. If the temperature gets too high within the furnace, the switch will open, causing the furnace to stop operating.
When the unit is at an appropriate temperature, the limit switch in the furnace allows for burner operation and the furnace will continue to send out heat.
When you turn up the heat on your thermostat, the burners will activate and begin heating up air inside the plenum. Let’s get into a more technical explanation of what your furnace limit switch does in the context of the entire heating system. But when it starts to trip or malfunction, you may need to know about this part and how to fix it. When your furnace is working correctly, you shouldn’t have to worry about your furnace limit switch. You may also hear it referred to as a fan limit switch or a limit switch. What is a furnace limit switch?Ī furnace limit switch is a device within your furnace that detects when the internal temperature is too high and turns the unit off as a safety measure.
In this guide, we’ll explain how your furnace high limit switch works, how it impacts your home, and solutions for when it malfunctions. Also known as a high limit switch, this small (but critical) component helps keep your home safe by automatically shutting off the system when your furnace gets too hot. Does your furnace keep shutting off unexpectedly or running in shorter cycles? If so, you might have a problem with your furnace limit switch.
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