3 Causes Why Your Furnace Isn’t Staying Lit and How to Fix It

A broken furnace is tedious to put up with. There are many reasons this can happen, but one of the most common is something wrong with the burners or associated systems. 

Newer models don’t count on pilot lights to keep the furnace lit. Instead, they use electronic ignition. If this ignition is damaged, the burners won’t work like they are supposed to. 

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

  • The thermostat directs your furnace to run. 
  • Your furnace’s draft inducer fan turns on to bring fresh air into 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 transports gas to the main burners, which are lit by the pilot light. 
  • Your furnace then sends warm air into your house via ductwork. 

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

Some of these malfunctions can be resolved on their own, but others are best handled by professional servicing. When you need the finest furnace repair in the U.S., get in touch with our heat Experts at 866-397-3787. We work with all brands and our services are ensured by a 100% Satisfaction Guarantee for a year.* 

Here are a number of the main reasons why your furnace isn’t staying lit and what to do to fix 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 could work erratically or not at all. Even if the sensor is functioning as normal, misaligned positioning leaves it unable to recognize the flame entirely. While you may try troubleshooting and cleaning this sensor by yourself, hiring an expert 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 functions that shut it off if it gets too hot. One of the most frequent causes is a filthy filter. We suggest evaluating your air filter every month. If you can’t see light through it, swap it out. 

3. Thermostat Malfunction 

Your thermostat informs your furnace when it should heat your home. When it’s not running normally, your furnace will require more energy to keep your home warm. This can be a battery or electrical issue, depending on what model of thermostat you own. We encourage referring to your owner’s manual or manufacturer’s website for necessary troubleshooting details. If you still can’t get yours working, call our Experts at 866-397-3787. We’ll identify the problem swiftly and can replace your thermostat, if that is required. 

A number of these issues, including a dirty flame sensor or an overheated furnace, are due to a lack of proper furnace maintenance. It’s crucial to have this service completed every year, because it may help stop breakdowns, boost your furnace’s energy efficiency and might even make it live longer. 

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

Inevitably, your furnace cannot work like it should despite 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 number one furnace brands, including Lennox®, to offer you affordable, energy-efficient heating options. 

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

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

Don’t worry about interruptions to your comfort for a second longer. Give Service Experts Heating, Air Conditioning & Plumbing a call at 866-397-3787 to arrange an appointment right away. 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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