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 multiple reasons this may happen, but one of the most common is a problem with the burners or relevant components. 

Newer systems don’t use pilot lights to keep the furnace lit. Instead, they use electronic ignition. If this ignition is damaged, the burners will not work like they are supposed to. 

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

  • The thermostat directs your furnace to activate. 
  • Your furnace’s draft inducer fan starts to bring fresh air toward your furnace. 
  • The gas valve opens to send gas into the pilot burner. 
  • An electronic spark starts the pilot light. 
  • The flame sensor tells your furnace that the pilot has been lit. 
  • The gas valve sends gas to the central burners, which are lit by the pilot light. 
  • Your furnace then moves warm air throughout your residence via ductwork. 

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

A number of of these problems can be fixed on their own, but others are best handled by professional assistance. When you need the best furnace repair in the U.S., call our heat Experts at 866-397-3787. We service all brands and our service is ensured by a 100% Satisfaction Guarantee for a year.* 

Here are several of the top reasons why your furnace isn’t staying lit and what to do about it. 

1. Dirty Flame Sensor 

Your furnace’s flame sensor is a safety system that informs your furnace when gas is ignited. If the sensor is dirty or damaged, it might work erratically or not at all. Even if the sensor is operating normally, misaligned positioning leaves it unable to recognize the flame entirely. While you can attempt troubleshooting and cleaning this sensor by yourself, contacting a pro like Service Experts Heating, Air Conditioning & Plumbing will make sure the problem is fixed swiftly and correctly. 

2. Furnace is Too Hot 

Your furnace utilizes built-in safety functions that force a shutdown if it gets especially hot. One of the most frequent causes is a clogged filter. We encourage inspecting your air filter every month. If you can’t see light through it, change it. 

3. Thermostat is Malfunctioning 

Your thermostat tells your furnace when it is time to heat your residence. When it’s not running properly, your furnace will require more energy to keep your residence warm. This can be a battery or electrical issue, depending on what model of thermostat you use. We suggest reviewing your owner’s manual or manufacturer’s website for relevant troubleshooting details. If you still can’t get yours working, reach out to our Experts at 866-397-3787. We’ll find the problem right away and can replace your thermostat, if needed. 

A number of these issues, such as a dirty flame sensor or an overheated furnace, are due to a lack of routine furnace maintenance. It’s vital to have this service completed annually, because it might help reduce breakdowns, improve your furnace’s energy efficiency and can even make it live longer. 

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

Eventually, your furnace won’t work like it’s supposed to in spite of attempts to repair or maintain it. When the time comes, consider Service Experts Heating, Air Conditioning & Plumbing and our expert furnace replacement in the U.S.. We work with some of the best furnace brands, such as Lennox®, to offer you affordable, energy-efficient heating options. 

When you’re considering replacing your furnace, consider taking advantage of our Advantage Program™. Buying a new furnace can be thousands of dollars out of pocket. As an Advantage member, you’ll get a new furnace for just one small monthly fee. There’s no down payment or installation expenses, and you get to hold on to any valuable rebates. 

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

Don’t worry about interruptions to your comfort for a moment 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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