Bad Thermostat, Bad Heating—The Basic Facts

When you rely on your heating system during our short winters, you expect the heater to, well, heat. If the heater isn’t providing sufficient warmth in the house, is heating some parts unevenly, or won’t come on at all, you’ll probably assume there’s a mechanical or electrical failure somewhere in the heater itself. But a large number of heating troubles come from a source outside of the heater: the thermostat.

Thermostat malfunctions can cause a range of comfort problems in a home. Unless you’re a professional HVAC technician, it’s difficult to diagnose whether a heating problem is coming from the thermostat or another source. No matter what you guess is the source of the heating issue, please always call for professional heating repair in Kyle, TX.


Thermostats can range from basic manual models that run off a slider/dial to intricate Wi-Fi thermostats with “smart” technology that essentially makes the thermostat a small computer. This also means there’s a range of ways a thermostat may end up malfunctioning.

A common error is a miscalibrated thermostat. The temperature sensor in the thermostat may start to register incorrect readings, and this will lead to the heater running longer than it should (creating a stuffy house and hot spots) or shutting down before it can reach the set temperature. Professionals can easily recalibrate the thermostat with specialized tools.

A thermostat can also start to pick up “ghost readings” because of where it’s positioned in the house. If you have a new thermostat, this might be the source of the problem. A thermostat put too close to windows or in direct sunlight will register temperatures too hot or cold for the rest of the house. If the thermostat is too far from the center of the house, it won’t pick up the general house temperatures.

Thermostats connect to the heating system’s control board through different wires that turn the blower fan and the heater on and off. If the thermostat loses a wiring connection, the heater won’t respond to certain instructions—meaning the blower fan may run continuously or not turn on.

The high-end Wi-Fi smart thermostats can have software malfunctions, leading to programming that doesn’t activate when it should, if it activates at all. Fortunately, smart thermostats usually have a method of communicating an error on their screens or through the apps that control them, so check to see if there’s an error message. You will need pros to fix a broken smart thermostat.


In some situations, the better option for a broken thermostat is to replace it rather than have it repaired. This is a good idea if you have an older digital thermostat and want to upgrade to one with more features. Installing a new thermostat can be risky if you try it on your own: the computer algorithms of a new unit may end up damaging the HVAC system. Our technicians are experts with the newest and best in climate control technology. They can help you make intelligent choices.

Call on iAir Services—The Intelligent choice today makes cents tomorrow!