How to Repair a Furnace That Wont Stay Lit

A malfunctioning furnace is frustrating to deal with. There are multiple reasons this can happen, but one of the most likely is an issue with the burners or related systems.

Newer furnaces don’t use pilot lights to keep the furnace ignited. Instead, they work via electronic ignition. If this ignition fails, the burners won’t perform like they are supposed to.

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

  • The thermostat directs your furnace to activate.
  • Your furnace’s draft inducer fan begins to spin in order to pull 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 transports gas to the central burners, which are lit by the pilot light.
  • Your furnace then distributes warm air across your home via ductwork.

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

Several of these malfunctions can be fixed on their own, but others need professional assistance. When you want the fastest furnace repair in Kingston, call our furnace Experts at 613-817-1591. We have experience with all brands and our work 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 to fix it.

1. Malfunctioning Flame Sensor

Your furnace’s flame sensor is a safety feature that informs your furnace when gas is ignited. If the sensor is dirty or faulty, it might work inconsistently or not at all. Even if the sensor is functioning like it should, poor positioning leaves it unable to detect the flame to begin with. While you could try troubleshooting and cleaning this sensor on your own, calling a pro like Service Experts Heating & Air Conditioning will make sure the problem is resolved swiftly and correctly.

2. Overheated Furnace

Your furnace uses built-in safety features that deactivates your furnace if it gets dangerously hot. One of the most frequent causes is a clogged filter. We recommend reviewing 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 residence. When it’s not running as it’s supposed to, your furnace will require more energy to keep your residence warm. This can be a battery or electrical malfunction, depending on what kind of thermostat you have. We recommend referring to your owner’s manual or manufacturer’s website for needed troubleshooting details. If you still can’t get yours working, contact our Experts at 613-817-1591. We’ll pinpoint the problem promptly and can replace your thermostat, if that is required.

Some of these issues, including a dirty flame sensor or an overheated furnace, are due to a lack of proper furnace maintenance. It’s important to have this service performed annually, because it could help stop breakdowns, boost your furnace’s energy efficiency and could even make it live longer.

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

Inevitably, your furnace cannot work like it’s supposed to regardless of attempts to repair or maintain it. When the time comes, reach out to Service Experts Heating & Air Conditioning and our quality furnace replacement in Kingston. We partner with some of the top furnace brands, such as Lennox®, to offer you affordable, energy-efficient heating equipment.

When you’re thinking about replacing your furnace, consider enrolling in our Advantage Program™. Buying 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 costs, and you get to hold on to any valuable rebates.

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

Don’t fret about interruptions to your comfort for a second longer. Give Service Experts Heating & Air Conditioning a call at 613-817-1591 to schedule an appointment today. 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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