Problem: Thermostat Not Working and Other Thermostat Problems

The thermostat for your furnace is the control device that determines when your furnace should turn on and off, and how much heat is needed to reach your family's desired indoor air temperature. If your furnace is not turning on or producing heat, it may be because you have a broken thermostat. Check the following to see if any of these items are causing your thermostat problems:

• Is your thermostat in heat mode?
• Is it set at the appropriate temperature setting that you would like?
• Have you move the temperature up or down a few degrees to see if your furnace turns on?
• Do the batteries need to be replaced on your thermostat?
• Is your thermostat in a drafty hallway or by an outside source that could be affecting the performance of the thermostat? If so, consider moving the thermostat to an area that is not affected by outdoor areas or 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.
• 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.
• Check wires in the thermostat for corrosion. If any is found, remove the wires and clean using a wire stripper.