Fixing a Furnace That Wont Stay Lit

A broken furnace is tedious to handle. There are many reasons this may happen, but one of the most common is a problem with the burners or associated systems.

Newer furnaces don’t depend on pilot lights to keep the furnace lit. Instead, they utilize electronic ignition. If this ignition stops working correctly, the burners can’t perform like they are supposed to.

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

  • The thermostat tells your furnace to turn on.
  • Your furnace’s draft inducer fan turns on to draw fresh air toward your furnace.
  • The gas valve opens to send gas into the pilot burner.
  • An electronic spark ignites the pilot light.
  • The flame sensor directs your furnace that the pilot has been lit.
  • The gas valve directs gas to the principal burners, which are lit by the pilot light.
  • Your furnace then transports warm air across your house via ductwork.

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

Several of these issues can be handled on their own, but others require professional assistance. When you need the finest furnace repair in San Antonio, call our heating Experts at 210-570-9705. 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 heating isn’t staying lit and what to do about it.

1. Faulty 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 erratically or not at all. Even if the sensor is running as normal, incorrect positioning leaves it unable to sense the flame entirely. While you can start troubleshooting and cleaning this sensor by yourself, hiring a pro like San Antonio Air Service Experts will make sure the problem is fixed swiftly and correctly.

2. Overheated Furnace

Your furnace has built-in safety functions that shut it off if it gets too hot. One of the most frequent causes is a filthy filter. We recommend inspecting your air filter every month. If you can’t see light through it, change it.

3. Thermostat Malfunction

Your thermostat commands your furnace when it should heat your house. When it’s not working properly, your furnace will have trouble keeping your home warm. This can be a battery or electrical issue, depending on what kind of thermostat you have. We suggest opening your owner’s manual or manufacturer’s website for needed troubleshooting info. If you still can’t get yours working, call our Experts at 210-570-9705. We’ll discover the problem promptly and can replace your thermostat, if necessary.

A number of these issues, including a dirty flame sensor or an overheated furnace, are due to a lack of consistent furnace maintenance. It’s extremely helpful to have this service done annually, because it could help reduce breakdowns, increase your furnace’s energy efficiency and could even make it survive longer.

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

Inevitably, your furnace won’t work like it used to regardless of attempts to repair or maintain it. When the time comes, reach out to San Antonio Air Service Experts and our professional furnace replacement in San Antonio. We work with some of the top furnace brands, including Lennox®, to offer you affordable, energy-efficient heating options.

When you’re thinking about replacing your furnace, consider enrolling in our Advantage Program™. Buying a new furnace can run thousands of dollars out of pocket. As an Advantage member, you’ll receive a new furnace for just one small monthly fee. There’s no down payment or installation expenses, and you get to keep any beneficial 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 guaranteed a fast response with 24/7 priority service. You’ll also receive discounts, no sneaky charges and many other benefits.

Don’t worry about interruptions to your comfort for a minute longer. Give San Antonio Air Service Experts a call at 210-570-9705 to request an appointment now. 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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