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Signs A Limit Switch On A Furnace May Be Failing Or May Have Already Failed

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A furnace relies on many different parts to properly and efficiently heat your home. If one of these parts fails, your furnace may be unable to properly heat your home. One of the parts that plays an important role in the function of your furnace is the limit switch. The limit switch helps to trigger the blower. Once your furnace heats up enough and produces enough heat, the limit switch triggers the blower to turn on, blowing that hot air into your home. The switch then triggers the blower to shut off when enough hot air has been produced. This part can become faulty or wear over time and need to be replaced. Here are three of the most common signs that your limit switch may be nearing the end of its life or may have already failed. 

Your Home Is Getting Hotter Than You Desire

One of the signs that your limit switch may be failing is your home getting hotter than you desire. If your kill switch is failing, it may be slow to act when your home gets hot enough. As such, it may not shut off the heater or the blower immediately, and your home can get hotter than you desire. In most cases, it will only be a few degrees warmer, but this is a key indication that your unit is not shutting off when it should. 

Air Continuously Blows Into Your Home

Another sign that your limit switch may be failing is air continuously blowing into your home. If the limit switch is malfunctioning or has failed, the furnace itself may stop producing heat when your home reaches your desired temperature. However, the blower may not turn off. As such, you may feel room temperature air blowing into your home or you may never hear the blower shut off. 

Your Furnace May Not Kick On At All

The final sign that your limit switch may have failed is a unit that will not turn on or kick on. Newer models of furnaces have computer monitoring systems. If the system detects anything wrong with the furnace, including a damaged limit switch, your unit may not turn on or heat your home until the part is replaced and the computer is reset. 

The limit switch on your furnace is not a part that you should attempt to replace on your own. If yours is showing any signs that it may be failing or at the end of its life, you should contact a heating repair specialist. They can take a look at your unit and replace the part if needed. Contact a heating repair professional today to schedule an appointment. 


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