Where is the limit switch located?
A limit switch is a device that’s located under your furnace’s supply plenum. It reads the temperature of the plenum and waits until it gets appropriately warm. Once the plenum reaches a specific temperature, the limit switch sends a signal to the air handler to begin running and delivering warm air to your home.
What does the limit switch do on a RV furnace?
The furnace fan limit switch is designed to activate and deactivate the furnace blower assembly. This component is responsible for transmitting warm air throughout the air ducts in your home. In addition, the furnace limit switch is also engineered to shut down the furnace to ensure it doesn’t overheat.
What is the main function of the main limit switch?
The primary limit switch is a temperature-activated sensor that protects your furnace from overheating whenever the fan fails to blow enough air over the heat exchanger. The limit switch also controls when the blower assembly turns on and off.
How do I know if my furnace limit switch is bad?
The most common sign of a malfunctioning limit switch is the continuous operation of your furnace’s blower. Just as the limit switch won’t allow the fan to turn on until the warm air has reached the right temperature, the limit switch also shuts down when the air cools to a certain temperature.
Can a furnace high limit switch go bad?
Like any other part in your HVAC system, the high limit switch can wear out over time. One of the most common issues that happens when a high limit switch goes bad is that it fails to signal the blower fan to turn off. High limit switches can also weaken over time so that they begin tripping at a lower temperature.
How do I know if my high limit switch is bad?
One of the most common issues that happens when a high limit switch goes bad is that it fails to signal the blower fan to turn off. If your fan keeps running continuously (and you’ve checked that your thermostat is set to AUTO rather than ON), that could be a sign of a bad high limit switch.
Can you run furnace without limit switch?
Can You Bypass the Furnace Limit Switch? The furnace should Not be run for an extended time with the jumper as the limit switch is a necessary safety feature. The limit switch turns the furnace off when it becomes too hot, which prevents the heat exchanger from becoming damaged.
Can a limit switch go bad?
Like other components in your heating system, the limit switch can malfunction. However, when a limit switch starts to go bad, it may not turn off at the end of a cycle; the result is a continuously-running blower. A second problem is common with a limit switch is that won’t allow the furnace to operate.
Why does my limit switch keep tripping?
If the air inside your furnace gets too hot, the limit switch trips to prevent overheating. If the furnace high limit switch trips due to overheating, there is likely an airflow issue that is preventing proper air movement through the system. A dirty filter is the most common cause of airflow issues.
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