How Much Does It Cost To Replace A Furnace Flame Sensor In Denver, CO

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A bad flame sensor. This is one of the most common furnace repair problems Denver homeowners will experience this winter. This article will answer three questions:

1. What does a flame sensor do?
2. Should I just clean the flame sensor or replace it?
3. How much should it cost to replace? 

What Does A Flame Sensor Do?
The job of the flame sensor is to quickly confirm that there is actually a flame present when the gas valve is open so natural gas isn’t being dumped inside your home instead of being burned inside the furnace. If the flame sensor isn’t able to confirm that a flame is actually burning inside the furnace, it will shut the startup sequence down, and the furnace will then attempt to startup again. Typically, once the furnace has attempted to startup three times without the flame sensor confirming a flame is present, the unit will go into a ‘lockout’ mode as a safety precaution before you can attempt to start the furnace again.

picture of a furnace flame sensor

This is what the flame sensor looks like inside your furnace.

Should You Just Clean The Flame Sensor Or Have It Replaced?
Depending on which furnace repair company you call, you might be faced with the decision to simply clean the flame sensor rather than replace it. Some HVAC companies will offer you the option of just cleaning it, while others don’t consider it worth mentioning, since it is at best a temporary solution. Cleaning the flame sensor removes the oxidation, but doesn’t actually address the root of the problem, so you can to have problems with your furnace again in the near future.


How Much Does It Cost To Replace A Furnace Flame Sensor In Denver?
Replacing the flame sensor is always going to be the best decision, so how much is this furnace repair going to cost you? That depends on what type of company you want working in your home to make the repair. I’m going to focus on how much a new flame sensor costs when you have one of the bigger well-known, reputable furnace repair companies in Denver replace it for you.

Depending on which furnace repair company you call, you can expect to pay anywhere from $350 to as much as $500 for a new flame sensor, plus the cost of the travel and diagnostic charge. Of course, that’s a little more than you would pay someone who operates their furnace repair service out of their garage, but let’s look at what you get for your money when you have one of the better companies in Denver replace your flame sensor.


6 Benefits Of Using The Top Denver Furnace Repair Companies

  1. Your furnace repair will usually be guaranteed for up to 1-year
  2. Knowledgable and experienced technicians making the repair
  3. Complete diagnostic inspection of your furnace
  4. Professional customer service staff to answer your call
  5. If there’s a problem the company will come back and fix it for free
  6. The best furnace repair companies in Denver offer a 100% Satisfaction Guarantee
image of a 100% satisfaction guarantee seal

The top furnace repair companies in Denver will always have a 100% Satisfaction Guarantee on their service.


Having one of Denver’s well-known, reputable furnace repair companies replace your flame sensor isn’t cheap, but it’s well worth the investment. You’ll have your furnace working again quickly, and you won’t have to hold your breath wondering if your furnace is going to stop working again because the technician used sub-standard parts, or didn’t really know what he was doing.





If you’d like to speak with someone at Altitude Comfort Heating and Air – furnace repair service, we’re open 7 days a week with no overtime charges.

If you’d like to learn more about why we’re one of Denver’s best heating repair companies you’ll see why more homeowners trust us when they need fast, reliable service.


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