Why Does My Furnace Run Constantly in Evanston, IL?

When you turn on your furnace this winter in Evanston, IL, the unit should pass through a normal heating cycle, turning on when indoor temperatures are too low and turning off when they have reached appropriate levels. A furnace should not run constantly, and if it does, that’s generally a sign of trouble. Here are a few possible explanations for why your furnace is working continuously.

Dirty Air Filters

Smooth airflow is perhaps the single most important variable in determining the efficiency of a furnace. If air can flow to the areas where it’s needed without obstruction, your furnace will use much less energy when heating your home. But if anything happens to obstruct airflow, your thermostat may end up pushing your furnace into overdrive.

Old and dirty air filters are among the most common causes of poor airflow in furnaces. If you don’t change your filters at least once every three months, they will begin to hinder airflow. In addition to the different kinds of damage this can cause to your unit, it may also force it to run constantly.

Thermostat Set Too High

Another possibility is that you absentmindedly set your thermostat much too high. Your furnace may struggle to bring your home to this extremely high temperature and may end up running constantly. Please be careful and make sure that you’ve set your thermostat properly.

Broken Limit Switch

After your furnace ignites and generates heat within itself, the next step is to properly distribute that heat throughout your home. A limit switch is crucial in this process since it is what tells the furnace to turn on the blower and begin pushing out hot air.

If the limit switch malfunctions for any reason, your furnace will not be able to warm your home. Instead, hot air will sit inside the furnace and persistently heat its interior, potentially causing serious damage.

In response, your thermostat may force your furnace to work harder, which will only exacerbate the problem. It’s important to call a repair technician to fix this problem.

No furnace should run constantly. If yours is, call Perfect Temperature Control and get the best heating services in Evanston, IL.

Image provided by iStock

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