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

A malfunctioning furnace is exhausting to deal with. There are many reasons this might happen, but one of the most common is something wrong with the burners or relevant parts. 

Newer furnaces don’t count on pilot lights to keep the furnace ignited. Instead, they utilize electronic ignition. If this ignition fails, the burners can’t function like they do normally. 

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

  • The thermostat informs your furnace to run. 
  • Your furnace’s draft inducer fan starts to pull fresh air into your furnace. 
  • The gas valve opens to move gas into the pilot burner. 
  • An electronic spark lights the pilot light. 
  • The flame sensor directs your furnace that the pilot has been lit. 
  • The gas valve moves gas to the principal burners, which are lit by the pilot light. 
  • Your furnace then sends warm air throughout your residence via ductwork. 

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

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

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

1. Faulty Flame Sensor 

Your furnace’s flame sensor is a safety feature that tells your furnace when gas is ignited. If the sensor is dirty or malfunctioning, it could work intermittently or not at all. Even if the sensor is operating as normal, incorrect positioning leaves it unable to detect the flame to begin with. While you can attempt troubleshooting and cleaning this sensor by yourself, calling a professional like Service Experts Heating, Air Conditioning & Plumbing will guarantee the problem is handled promptly and correctly. 

2. Overheated Furnace 

Your furnace contains built-in safety features that shut it off if it gets too hot. One of the most typical causes is a clogged filter. We encourage inspecting your air filter each month. If you can’t see light through it, swap it out. 

3. Thermostat is Malfunctioning 

Your thermostat commands your furnace when it should heat your residence. When it’s not running properly, your furnace will have trouble keeping your home warm. This can be a battery or electrical malfunction, depending on what kind of thermostat you have. We recommend reviewing your owner’s manual or manufacturer’s website for relevant troubleshooting information. If you still can’t get yours working, call our Experts at 866-397-3787. We’ll discover the cause promptly and can replace your thermostat, if necessary. 

A number of these issues, like a dirty flame sensor or an overheated furnace, are a result of a lack of routine furnace maintenance. It’s highly beneficial to have this service performed once a year, because it might help minimize breakdowns, enhance your furnace’s energy efficiency and might even make it survive longer. 

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

Inevitably, your furnace cannot work like it used to regardless of attempts to repair or maintain it. When the time comes, trust Service Experts Heating, Air Conditioning & Plumbing and our top-notch furnace replacement in the U.S.. We work with some of the top furnace brands, like Lennox®, to offer you affordable, energy-efficient heating equipment. 

When you’re contemplating replacing your furnace, consider signing up for our Advantage Program™. Buying 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 charges, and you get to hold on to any beneficial rebates. 

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

Don’t put up with interruptions to your comfort for a second longer. Give Service Experts Heating, Air Conditioning & Plumbing a call at 866-397-3787 to request an appointment today. Whether you want 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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