Furnace Not Igniting or Heating?

How to Troubleshoot and Fix a Furnace

It can be very worrisome when your furnace isn’t igniting or heating. Not only is it uncomfortable to not have heat in the winter, but it can also be dangerous if the problem goes on for too long. In this article, we will walk you through how to troubleshoot and fix a furnace that isn’t igniting or heating properly. We will also show you how to test the igniter so that you can identify the source of the problem. Let’s get started!

Why Is My Furnace Not Igniting?

There are several reasons why your furnace might not be igniting. One of the most common causes is a problem with the igniter itself. If the igniter is damaged, it won’t be able to create the spark that’s needed to ignite the gas in the furnace. Another possibility is that there is something blocking the igniter from doing its job. This could be a build-up of dirt or debris, or it could be an obstruction in the gas line.

Another possibility is that the pilot light is out. If this is the case, you’ll need to relight it before your furnace will work again. Finally, if none of these solutions seem to be working, it’s possible that there’s a more serious problem with your furnace. In this case, it’s best to call a professional for help.

How Do I Test the Igniter?

If you’re not sure whether or not the igniter is the source of the problem, you can test it to find out. First, make sure that the power is turned off to the furnace. Then, remove the access panel so that you can see the igniter. Once you have access to the igniter, use a multimeter to test it for continuity. If there is no continuity, then the igniter needs to be replaced.

How Do I Fix a Furnace That Isn’t Heating, but the Igniter is Working?

There are several possible solutions if your furnace isn’t heating properly. One possibility is that the air filter is dirty. If the air filter is clogged, some furnaces will shut down to prevent them from overworking and burning out the motor. If the system does not shut down, you may notice your furnace continuously running but the heat is not being distributed throughout your home. If this is the case, you’ll need to replace the filter as soon as possible. Another possibility is that the thermostat is set too low. 

How to Troubleshoot and Fix a Furnace

Check Your Thermostat

As mentioned above, one often overlooked possibility is that the thermostat is set too low. Most furnaces can maintain an indoor temperature difference of about 70º above the outdoor temperatures. If the weather outside is above 0ºF, you’ll need to adjust your thermostat to a higher temperature. If temperatures outdoors are subzero, you may have to bundle up and settle for a bit of discomfort.

Another possibility is that the thermostat isn’t working properly. In this case, you’ll need to do some research on the type of thermostat you have and ways to fix any error that might be displayed. If you need to replace your thermostat with a new one, we recommend investing in a smart thermostat. Either way, we commonly find that the issue isn’t with the furnace itself but with the thermostat.

Furnace Gas Connection

Check Your Gas Line

If you have a natural gas furnace, one possibility is that there’s a problem with the gas line. This could be a leak, or it could be that the gas isn’t turned on. If you suspect that there’s a problem with the gas line, it’s important to call a professional for help. This is because working with natural gas can be dangerous if you don’t know what you’re doing.

Broken Flame Sensor

Another possibility is that the flame sensor is broken. A flame sensor is a safety device that turns off the gas if it detects that the flame has gone out. If this happens, you’ll need to replace the sensor. Give us a call and we’ll come out as soon as possible to handle the repair for you.

Dirty Gas Burner

Last but not least, your gas burner may be dirty. This can happen if there’s a build-up of dirt or debris. If this is the case, you’ll need to clean the burner.

Call an HVAC Professional

If you’ve tried all of the above solutions and your furnace still isn’t igniting or heating properly, then it’s time to call a professional for help. A qualified HVAC technician will be able to diagnose the problem and get your furnace up and running again in no time. Furnaces are complex pieces of machinery, so it’s best to leave repairs to us.

We hope this article has been helpful in troubleshooting your furnace issue. Furnaces are an essential part of many homes, so it’s important to keep them in good working order. With a little bit of knowledge, you should be able to fix minor furnace problems on your own but if you need any help, don’t hesitate to contact us. 

Call the Professionals

HVAC systems are complex so you should leave checkups and repairs to the professionals. Even with a new system, it is important to have biannual services done to make sure your system is running properly. If there is an issue, the technician will be able to identify and correct it before it causes a system failure, costing you thousands of dollars to replace. Regular maintenance will also save you money on your monthly energy bill by keeping your system running at peak performance. 

If you would like to schedule routine maintenance for your HVAC system or are curious about our service packages, visit callgnoth.com/furnace-repair or call Gnoth & Lukowski Heating & Air Conditioning LLC at (574) 287-3550. We have been serving the South Bend-Mishawaka area for over 30 years and offer 24-hour emergency repair services at no extra charge.