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Thermostat Repair

How to Fix a Broken Thermostat in Need of Repair

Fix a Broken Thermostat


As a homeowner in the Dallas, TX area, you know how important a properly functioning heating and cooling system is. If your HVAC system isn’t working properly, it may not be a problem with your AC unit or furnace, it could be an issue with a broken thermostat. A broken or malfunctioning thermostat can cause extreme temperature swings, a unit that cycles on and off too often, or a furnace that doesn’t produce heat. If you’re experiencing any of these problems, check your thermostat first.

Before you do anything, be sure that your HVAC system has power. Check to see if a breaker has been tripped or if you have a blown fuse. If your HVAC system is getting power, the next step is to check if your thermostat needs new batteries. Test or simply replace the batteries in your thermostat with fresh new batteries (check your owners manual for details).

Schedule Thermostat Repair OnlineBefore moving forward with a “Fix,” you’ll also want to be sure that your thermostat is set properly. If it’s winter, make sure your thermostat is set to “Heat.” During the Summer or warmer months, you’ll want your thermostat set to “Cool.” This is obvious, but easily, and often overlooked. If it seems like your AC or furnace is constantly blowing air, check to see if your thermostat’s fan is set to “On.” It should be set to AUTO. This will ensure that the blower is only working when your HVAC system is producing warm or cool air.

How to Fix a Broken Thermostat:

  • Test or replace the batteries (digital thermostats only). If your thermostat is wireless, make sure you’re using AA Lithium batteries (or manufacturer recommended batteries).
  • Check for loose wires or screws and tighten as necessary
  • Dust and clean your thermostat
  • Check thermostat location – you want to be sure your thermostat isn’t in direct sunlight or close to a heat source, as this could greatly impact the accuracy of your thermostat
  • Check the balance (on older, mechanical thermostats – if your thermostat isn’t level, your mercury switch may not work properly)
  • Check Anticipator (Check out this great article on Adjusting the thermostat heat anticipator on mechanical thermostats)

If you’re interested in how a mechanical thermostat works, check out this great “Mr. Wizard’s World” video on “How it Works” from Nickelodeon.

Thermostat Still Broken?

If none of these tips get your AC or furnace working properly, give the expert HVAC techs at King Air Conditioning a call. We’ll get a tech out to your house right away to diagnose and fix the problem, or install a new thermostat. If you do need a new thermostat installed, we recommend investing in a smart, programmable or wireless thermostat, as they can keep your family comfortable, and save you money.

Call King Air Conditioning today if your thermostat is broken or malfunctioning – 214.771.9134

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