Do You Have an HVAC Thermostat Issue?

During the warmer weather, a well-functioning air conditioner is essential for home comfort. Thermostat problems can cause severe issues with the HVAC system and directly impact the cooling system performance and comfort of your home or business. The malfunctions of a thermostat usually create subtle or sudden changes in the performance of your cooling system.

A faulty thermostat may be to blame if:

  • The air conditioner runs almost nonstop
  • Space isn’t reaching the desired temperature setting
  • A complete cooling system failure.

Here are some of the HVAC thermostat issues to look at with a quality HVAC expert:

Simple Power Problems

If the display on your wireless thermostat is not indicating power, try simply replacing its batteries. If the system is running at inconsistent times, ensure that you are using AA Lithium batteries. Alkaline batteries will run out of juice quickly and may cause inconsistencies and failures in your system. If it’s not the battery, check the power switch; it’s easy to mistake this for a light switch and turn it off. If it’s not the battery, it could be a fuse or circuit breaker.

Mismatched Components

Your thermostat needs to match your HVAC system correctly  for proper operation. Low voltage thermostats are typically used in residential applications. Your thermostat must be matched to your HVAC system on the type, capability, and capacity. Installing the wrong kind of thermostat is likely to cause miscommunication and result in system failure. Consult with an HVAC professional to verify proper matching.


Loose connections, disconnections, and faulty and aging wiring can cause your thermostat to lose its connection to your heating and cooling systems, thereby creating an interruption in service. If your HVAC system stops working correctly, it’s a good idea to inspect your thermostat’s wiring. Consult with a knowledgeable HVAC professional to inspect the wiring.

Dust and Debris

If you have an erratic operation or a sudden system failure, it can be due to a dirty thermostat. To address this issue, remove the cover from your thermostat, and gently clean its interior components—including the bimetallic coil and switch contact surfaces. First, set the thermostat to its lowest setting and use a soft brush or compressed air to clean the bimetallic coil. Set the thermostat to the highest setting. Clean the coil again. Then, reset the thermostat to your preferred setting.

Inaccurate Temperature Readings

If your HVAC system fails to kick on when it should, or if it turns on when it shouldn’t, an inaccurate temperature reading may be the culprit. Check to ensure that your thermostat is installed in the proper location—away from outside doors and windows and heat sources such as fireplaces and radiant heaters. Exposure to direct sunlight, heat emissions, and outdoor temperatures will give your thermostat an inaccurate reading, thereby triggering your furnace to turn on and off when it shouldn’t. It is highly recommended that thermostat be located close to the return (where the filter is installed) to allow for the most accurate temperature reading possible.

Do you need a company to handle the maintenance or repair of your HVAC system? If yes, give TRUST Heating & Air a call at 678-926-9676.

Contact Us

Contact the pros at TRUST Heating & Air to discuss savings tips and free estimates. We have 24/7 Emergency Services. Just call us at 678-926-9676 to come out and resolve the problem.