My Thermostat is on – Why Isn’t My Furnace Working?

With a flick of your finger, you can transform your cold home into a cozy sanctuary. But what happens if you set your thermostat but the furnace refuses to turn on (or repeatedly turns off)? 

Furnace Installation

There are many causes for a malfunctioning gas furnace, so it’s important to narrow down to the right one so you can address it appropriately. 

Three reasons a furnace can stop working

1. Maintenance issues

If you fail to perform regular maintenance on your furnace, it’s only a matter of time before an issue arises. Crucial maintenance tasks range from replacing the air filter to vacuuming the inside of the unit to remove dust from moving components. 

To make sure your system is working at peak effectiveness and efficiency, we recommend a professional furnace tune-up at the beginning of each heating system

2. A safety switch is on

Most furnaces today are built with a series of safety switches that prevent the unit from operating if something is seriously wrong. These devices are very important for preventing dangerous situations such as fires and gas leaks inside your home, however, they can also keep the furnace from running when you need it.

There are three categories of furnace safety switches:

  • Pilot sensor – Turns the unit off if the pilot light is extinguished, which prevent natural gas from seeping into the home
  • Limit switch – Prevent the heat exchanger from overheating, which could result in a carbon monoxide leak
  • Roll-out switch – Cuts the flow of gas if the burner flames get too large

3. Disrupted natural gas supply

A gas furnace needs a constant flow of natural gas to burn and create heat that is distributed throughout the home. If there’s a problem with the supply of gas, then the furnace will work intermittently or not at all. A stuck gas valve or faulty control board could be to blame in this situation.  

Furnace maintenance and repair in Evansville, IN

If your furnace is letting you down even though the thermostat appears to be working, it’s best to bring in a professional HVAC technician. Don’t risk injury or causing worse damage to your system. Instead, trust the experts at Baylor Heating & Air Conditioning, Inc. To schedule furnace maintenance or repair, call (812) 425-8435.