5 Common Reasons Your HVAC’s Thermostat Isn’t Working

Your HVAC’s thermostat plays a vital role as it regulates the system. Therefore, it has to be functioning properly. For some homeowners, a thermostat may seem like something that allows them to control their temperature levels. The truth is, it’s vital for proper warm and cold air circulation throughout the property. 

If the thermostat isn’t working properly, then it’s essential you address it immediately. Indeed, thermostat glitches happen, but there are times when you need the help of a professional to make it work. 

In this post, we’ll discuss the most common reasons your thermostat isn’t working properly: 

1. Wear and Tear Due to Age

One of the most common reasons why your thermostat isn’t working is its age. As it ages, it can become less effective through natural wear and tear. Therefore, if it’s been with you for many years, then you might need to consider a replacement. 

2. Faulty Wiring or Parts

Faulty wiring or parts can cause your HVAC’s thermostat to malfunction. Check the wiring for loose wires, and if you see worn-out cables, it’s best to replace them. 

You will also see the electrical resistor device that sends a message to the thermostat to turn off the system. If this is malfunctioning, your HVAC may cycle on and off unnecessarily. The good news is you can adjust it to find the right settings. On the other hand, a programmable thermostat comes with a built-in anticipator that can set itself automatically. 

3. Defects on Programming

Another reason your thermostat isn’t working is due to a glitch in the programming. This usually happens when you experience an abrupt power failure. A solution to this is to reprogram the chip, or if you have the budget, consider buying newer models of HVAC systems as they usually come with programmable thermostats that have stronger memory systems, which can endure more despite sudden power failures. 

4. No More Batteries

Batteries retain your thermostat settings during a power outage. Ideally, the batteries will last for at least one year, and most homeowners usually fail to replace them at the right time. It’s essential to track your system’s batteries and replace them even before they run out. 

Programmable thermostats show a warning symbol when the batteries are low, and if you notice that the display is blank, it’s time to replace the batteries. When this happens, you can’t control the system anymore, which means you won’t have control over the temperature levels. 

5. Unsuitable Location

The location where your thermostat is can also affect its functionality. As much as possible, the thermostat shouldn’t be in direct sunlight or near exterior doorways. The best place to mount the thermostat is on a wall that has a high thermal coefficient. Therefore, if you think your thermostat isn’t in the best location, consider moving it to a central location to allow for equal distribution of cold or warm air. 


Knowing the common reasons behind thermostat issues is important. That way, you’ll be more informed to find the right solutions. As much as possible, let professionals handle any issue you have with your thermostat. Legacy Heating and Cooling carries top brand name thermostats such as Ecobee, Google Nest and Honeywell.

Legacy Heating offers professional HVAC repair in Edmonton, AB. We specialize in residential new home construction and installation and replacement of HVAC systems and other parts. We also have HVAC products. Contact us today!

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