How to Fix a Furnace That Wont Stay Lit

A malfunctioning furnace is frustrating to handle. There are several reasons this may happen, but one of the most frequent is a problem with the burners or related systems.

Newer furnaces don’t depend on pilot lights to keep the furnace going. Instead, they use electronic ignition. If this ignition malfunctions, the burners can’t perform like they are supposed to.

When your gas furnace is functioning normally, here’s how it should operate:

  • The thermostat informs your furnace to activate.
  • Your furnace’s draft inducer fan starts to draw fresh air into your furnace.
  • The gas valve opens to direct gas into the pilot burner.
  • An electronic spark lights the pilot light.
  • The flame sensor tells your furnace that the pilot has been ignited.
  • The gas valve moves gas to the principal burners, which are lit by the pilot light.
  • Your furnace then moves warm air into your home via ductwork.

If something fails during this process, your furnace will deactivate for safety reasons. Or it might turn off a few minutes into heating because it’s too warm.

Some of these problems can be repaired on their own, but others are best handled by professional help. When you need the best furnace repair in North America, reach out to our heat Experts at 866-397-3787. We repair all brands and our services are ensured by a 100% Satisfaction Guarantee for a year.*

Here are a few of the typical reasons why your heater isn’t staying lit and what to do to fix it.

1. Malfunctioning Flame Sensor

Your furnace’s flame sensor is a safety component that tells your furnace when gas is ignited. If the sensor is dirty or faulty, it could work intermittently or not at all. Even if the sensor is operating like it should, misaligned positioning leaves it unable to detect the flame entirely. While you may start troubleshooting and cleaning this sensor by yourself, trusting a professional like Service Experts Heating & Air Conditioning will make sure the problem is fixed swiftly and correctly.

2. Furnace is Too Warm

Your furnace uses built-in safety procedures that force a shutdown if it gets dangerously hot. One of the most frequent causes is a filthy filter. We encourage inspecting your air filter every month. If you can’t see light through it, swap it out.

3. Thermostat Malfunction

Your thermostat directs your furnace when it is time to heat your home. When it’s not operating correctly, your furnace will struggle to keep your residence warm. This can be a battery or electrical issue, depending on what type of thermostat you own. We encourage reviewing your owner’s manual or manufacturer’s website for relevant troubleshooting instructions. If you still can’t get yours working, call our Experts at 866-397-3787. We’ll identify the cause right away and can replace your thermostat, if that is required.

Several of these issues, such as a dirty flame sensor or an overheated furnace, are a result of a lack of consistent furnace maintenance. It’s highly beneficial to have this service done yearly, because it could help minimize breakdowns, increase your furnace’s energy efficiency and might even make it live longer.

We Have You In Good Hands When It’s Time for Furnace Replacement

With enough time, your furnace won’t work like it used to regardless of attempts to repair or maintain it. When the time comes, call Service Experts Heating & Air Conditioning and our top-notch furnace replacement in North America. We partner with some of the best furnace brands, including Lennox®, to offer you affordable, energy-efficient heating systems.

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

What’s even better is that Advantage members don’t pay a dime for repairs** or maintenance. If disaster strikes, you’re protected with 24/7 priority service. You’ll also obtain discounts, no last-minute charges and lots of other benefits.

Don’t struggle with interruptions to your comfort for a minute longer. Give Service Experts Heating & Air Conditioning a call at 866-397-3787 to arrange an appointment today. Whether you are looking for 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.

Contact Us