How to Troubleshoot a Furnace That Wont Stay Lit

A broken furnace is frustrating to put up with. There are several reasons this might happen, but one of the most likely is a problem with the burners or associated parts.

Newer models don’t rely on pilot lights to keep the furnace lit. Instead, they use electronic ignition. If this ignition fails, the burners will not perform like they are supposed to.

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

  • The thermostat tells your furnace to turn on.
  • Your furnace’s draft inducer fan begins to spin in order to pull fresh air through your furnace.
  • The gas valve opens to move gas into the pilot burner.
  • An electronic spark lights the pilot light.
  • The flame sensor informs your furnace that the pilot is burning.
  • The gas valve directs gas to the central burners, which are lit by the pilot light.
  • Your furnace then provides warm air across your residence via ductwork.

If something fails during this procedure, your furnace will turn off for safety reasons. Or it might shut down a few minutes into heating because it’s overheating.

Several of these malfunctions can be repaired on their own, but others need professional assistance. When you want the best furnace repair in Canada, call our heat Experts at 866-397-3787. We repair all brands and our work is backed by a 100% Satisfaction Guarantee for a year.*

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

1. Malfunctioning 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 may work erratically or not at all. Even if the sensor is running like it should, misaligned positioning leaves it unable to detect the flame at all. While you may try troubleshooting and cleaning this sensor right away, calling a professional like Service Experts Heating & Air Conditioning will make sure the problem is handled swiftly and correctly.

2. Furnace is Too Warm

Your furnace has built-in safety procedures that deactivates your furnace if it gets especially hot. One of the most common causes is a clogged filter. We encourage inspecting your air filter every month. If you can’t see light through it, replace it.

3. Thermostat Malfunction

Your thermostat directs your furnace when it should heat your home. When it’s not functioning properly, your furnace will struggle to keep your home warm. This can be a battery or electrical malfunction, depending on what kind of thermostat you use. We encourage checking your owner’s manual or manufacturer’s website for needed troubleshooting information. If you still can’t get yours working, get in touch with our Experts at 866-397-3787. We’ll uncover the cause quickly and can replace your thermostat, if necessary.

Some 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 crucial to have this service performed annually, because it might help reduce breakdowns, enhance your furnace’s energy efficiency and can even make it live longer.

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

Eventually, your furnace won’t work like it should despite attempts to repair or maintain it. When the time comes, call Service Experts Heating & Air Conditioning and our excellent furnace replacement in Canada. We partner with some of the number one furnace brands, like Lennox®, to offer you affordable, energy-efficient heating equipment.

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 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 strikes, you’re supported with 24/7 priority service. You’ll also enjoy discounts, no last-minute charges and many other benefits.

Don’t fret about 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 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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