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Serving the Treasure Coast


Serving the Treasure Coast


Mechanical Air Conditioning Blog

Why Your Furnace Isn’t Coming On

When your furnace doesn’t come on as it should, you might panic. Sometimes this can be a small and easy problem to fix, but other times it’s a red flag but something major is going wrong inside of your furnace. Either way, it’s time to schedule heating repair in Port St. Lucie, FL.

You can keep reading to learn more about the reasons that your furnace might not be coming on. Some of the problems are ones that you can troubleshoot on your own, but others require a certified HVAC professional. No matter what the issue is, our team is here to help. Just give us a call to schedule your furnace repair appointment today.

Thermostat Issues

When your furnace won’t turn on, the first place to check isn’t actually your furnace at all. Instead, you want to take a look at your thermostat. Make sure that your thermostat is set to heat and that the temperature is higher than your current indoor air temperature. If all of the settings are correct, your thermostat may be miscalibrated. Our team can reset your thermostat if that is the problem with your furnace not turning on. 

We can also check the thermostat batteries and clean out the inside of the thermostat, in case those are contributing factors to the issue. In some cases your thermostat is simply outdated and needs to be replaced. We can talk to you about your options, including Wi-Fi-enabled smart thermostats that can help you save on your energy costs. 

Lack of Airflow

It’s also possible that a lack of airflow inside of your furnace is preventing it from turning on. For example, if the filter on your furnace gets too full of dirt and other particles, then the air cannot get through and into your furnace for heating. Your air filter is the single air intake source for your furnace. Changing out the filter regularly is crucial for good airflow.

When your furnace is not bringing in airflow to heat, it ends up working harder to try and bring air in. If these efforts don’t help, your furnace may shut down as a safety response to potential overheating. If it does continue operating despite the lack of airflow, eventually the strain on your furnace can lead to the system not working at all.

Heat Source

Whether you have a gas or electric furnace, it is also common to have problems with the source of heat within your furnace. When you have an electric furnace, the heating elements can go out and stop working. When you have a gas furnace, there may be issues with the pilot light, gas lines leading into your furnace, or the attached safety switches. 

When the heating elements or igniter cannot do their part to create heat for transferring into the air, nothing else inside of your furnace matters. Without heat, your furnace is simply blowing room temperature air through the system and out into your home, if it is even operating at all.

Contact Mechanical Air Conditioning for your heating needs. Schedule an appointment today with our team of expert technicians.

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