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Thermostat not working? Here are potential reasons why...

Last updated 6 years ago

If your furnace is not turning on or producing heat, you may have a broken thermostat. Be sure to check the following to see if any of these items are causing your thermostat problems:

  • Have you adjusted the temperature up a few degrees to see if your furnace turns on?
  • Do the batteries need to be replaced in your thermostat?
  • Is your thermostat in heat mode?
  • Is it set at the temperature setting that you would like?
  • Is your thermostat in a drafty hallway or by a window or door that could be affecting performance? If so, move the thermostat to a location that is not easily affected by outdoor temperatures.
  • Do you need extra insulation to fix your digital thermostat problems? To find out, turn off the power to both the thermostat and heating system. Remove the thermostat cover and see if any cool or warm air comes through. If so, remove the entire unit and caulk or add extra insulation around the opening.
  • Check wires in the thermostat for corrosion. If any are found, remove the wires and clean using a wire stripper.
  • Make sure your thermostat is clean from dust and dirt. Using a small toothbrush or paint brush, clean the small metal plates (the contacts) within the unit. Do not touch these contacts, or any other interior parts, with your fingers.

If your thermostat is still not working after checking these items above, call 1-800-BLUE DOT or schedule an appointment online with one of our Trust Certified technicians. We have reliable and same day service to find and fix your thermostat problems.


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