3 Reasons Why Your Furnace Isn’t Staying Lit and How to Repair It

A faulty furnace is exhausting to put up with. There are lots of reasons this can happen, but one of the most common is an issue with the burners or associated parts.

Newer models don’t depend on pilot lights to keep the furnace ignited. Instead, they use electronic ignition. If this ignition stops working correctly, the burners won’t function like they do normally.

When your gas furnace is performing normally, here’s how it should run:

    • The thermostat informs your furnace to turn on.
    • Your furnace’s draft inducer fan begins to spin in order to bring fresh air through your furnace.
    • The gas valve opens to send gas into the pilot burner.
    • An electronic spark ignites the pilot light.
    • The flame sensor directs your furnace that the pilot has been lit.
    • The gas valve directs gas to the main burners, which are lit by the pilot light.
    • Your furnace then distributes warm air throughout your home via ductwork.

If something goes wrong during this process, your furnace will stop for safety reasons. Or it might shut down a few minutes into heating because it’s too warm.

Some of these malfunctions can be resolved on their own, but others need professional servicing. When you want the fastest furnace repair in the U.S., contact our heat Experts at . We repair all brands and our service is supported by a 100% Satisfaction Guarantee for a year.*

Here are a number of the most common reasons why your furnace isn’t staying lit and what to do moving forward.

1. Faulty Flame Sensor

Your furnace’s flame sensor is a safety system that notifies your furnace when gas is ignited. If the sensor is dirty or damaged, it could work inconsistently or not at all. Even if the sensor is running as normal, poor positioning leaves it unable to sense the flame entirely. While you could start troubleshooting and cleaning this sensor right away, trusting a pro like Service Experts Heating, Air Conditioning & Plumbing will ensure the problem is taken care of promptly and correctly.

2. Overheated Furnace

Your furnace uses built-in safety functions that force a shutdown if it gets too hot. One of the most common causes is a dirty filter. We suggest inspecting your air filter every month. If you can’t see light through it, change it.

3. Thermostat is Malfunctioning

Your thermostat directs your furnace when it is time to heat your house. When it’s not functioning correctly, your furnace will require more energy to keep your home warm. This can be a battery or electrical problem, depending on what kind of thermostat you have. We encourage opening your owner’s manual or manufacturer’s website for necessary troubleshooting procedures. If you still can’t get yours working, get in touch with our Experts at . We’ll uncover the issue promptly and can replace your thermostat, if necessary.

Some of these issues, including a dirty flame sensor or an overheated furnace, are caused by a lack of consistent furnace maintenance. It’s highly beneficial to have this service performed every year, because it could help stop breakdowns, increase your furnace’s energy efficiency and might even make it live longer.

We Have You Covered When It’s Time for Furnace Replacement

won’t work like it’s supposed to despite attempts to repair or maintain it. When the time comes, reach out to Service Experts Heating, Air Conditioning & Plumbing and our professional furnace replacement in the U.S.. We work with some of the number one furnace brands, including Lennox®, to offer you affordable, energy-efficient heating equipment.

When you’re contemplating replacing your furnace, consider signing up for our Advantage Program™. Getting a new furnace can be thousands of dollars out of pocket. As an Advantage member, you’ll be given a new furnace for just one affordable monthly fee. There’s no down payment or installation expenses, and you get to pocket any valuable rebates.

What’s even better is that Advantage members don’t pay a penny for repairs** or maintenance. If disaster strikes, you’re guaranteed a fast response with 24/7 priority service. You’ll also obtain discounts, no hidden charges and many other benefits.

Don’t fret about interruptions to your comfort for a minute longer. Give Service Experts Heating, Air Conditioning & Plumbing a call at to schedule an appointment now. Whether you need repairs or if it’s time for a new furnace, we guarantee your satisfaction.


*Not applicable to the Advantage Program. See your signed Advantage Program agreement for full details and exclusions. 100% Satisfaction Guarantee is subject to certain restrictions and limitations as set forth in the applicable Terms and Conditions. **See your signed Advantage Agreement for details.

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© 2023 Service Experts, Service Experts Heating & Air Conditioning, and the Service Experts logo and design are registered trademarks of Service Experts LLC and used under license by SE Canada Inc. All Rights Reserved. *Not applicable to the Advantage Program. See your signed Advantage Program Agreement for full details and exclusions. 100% Satisfaction Guarantee is subject to certain restrictions and limitations as set forth in the applicable Terms and Conditions.