Sorry, the web browser you're using is not supported by this website.

Please use Google Chrome, Firefox, Safari, or another browser to access homex.com. Thank you.

Skip to main content

We use cookies to enhance your experience. For details on how we use cookies, collect data, & how to manage your consent please see our Cookie Policy & Privacy Policy.

Identifying a Faulty Thermostat

Your thermostat regulates the temperature in your home. If you notice your HVAC systems starting and stopping at random times, your thermostat may be at fault.

Why Is My Thermostat Not Working?

From tripped circuit breakers and blow fuses to loose wires or old batteries, your thermostat may be struggling for a number of reasons.

Some signs your thermostat isn’t working are noises coming from your thermostat, your AC and furnace systems are operating inconsistently, or the thermostat screen is displaying inaccurate temperature readings.

How to check for a faulty thermostat

  • Thermostats determine the temperature within the area of the thermostat itself. Even if your thermostat is working properly, it may be fooled if the thermostat is in a bad location, such as a near a window, vent, ceiling fan, or in direct sunlight. If one of these factors is affecting your thermostat's ability to read the temperature, it will turn your heating and cooling systems on or off at inappropriate times.

  • If one area of your home is much warmer or cooler than the rest of your house, check the thermostat to see if someone accidentally shut it off or turned it down. In that case, you will simply need to revert those settings to the temperature settings you'd prefer.

  • Try changing some of the settings on your thermostat. Is it responding to input from the buttons or touch screen? If it's on but not responding, it's likely faulty. If the screen is completely blank, the thermostat may be out of batteries.

Other issues

The thermostat isn't the only thing that can cause your AC to keep turning on and off, or your furance. Consider other issues.

What to Do If Your Thermostat Isn’t Working?

A faulty thermostat can affect the operation and efficiency of your HVAC systems, so you’ll want to fix it right away to save your units from any damage. If you’ve reset breakers and cleaned the inside of your thermostat and it’s still not working, there may be a larger issue at hand.

For some guidance, one of our Remote Assist technicians can provide a virtual diagnosis of your thermostat — putting you one step closer to restoring regular temperatures and comfort to your home.

NOTE: This content is for informational purposes only, and HomeX and its affiliates disclaim all liability related to it. If you decide to perform any tasks based on this information, you assume all risks, including the risk of loss or damage to property or personal injury.

Let's Get It Fixed!

Our virtual experts can diagnose your issue (for free!) and resolve simple problems.

What Did You Think of This Article?

What Did You Think of This Article?