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what causes delayed ignition on gas furnace

by Dr. Garry Nolan Published 3 years ago Updated 3 years ago

What causes delayed ignition on a gas furnace?

  • Moisture buildup. Over a period of furnace inactivity, moisture tends to build up inside your system, corroding its...
  • Dust and lint. While moisture and rust are one of the most common causes of delayed ignition in furnaces, dust and lint...
  • Sulfur buildup. Your furnace can also experience delayed ignition due to a sulfur...

Delayed ignition is caused by moisture building up in the furnace over a period of inactivity. The moisture begins to corrode the firebox which blocks the ports that feed gas into the burners. Should the ports get blocked, the burners down the line fail to light promptly.Jun 4, 2021

Full Answer

What causes a delayed ignition boom in your furnace?

  • The gas valve opens and sends gas to the burners where it’s then ignited by the ignitor (or pilot light for older furnaces).
  • Heat from the burner flames heats the heat exchanger
  • Your blower blows air over the heat exchanger and then pushes that heated air throughout your home.

How to fix the ignitor problem on a furnace?

How to Troubleshoot Electric Ignition Furnace Problems

  • Signs of a Furnace Problem. The first step to addressing a malfunctioning igniter is knowing you have a problem. ...
  • Common Causes of Igniter Problems. Problems with an electric ignition can vary. ...
  • Before Calling a Pro. Factors you can fix yourself, such as dirty filters or tripped breakers, can affect your furnace’s ignition.
  • When to Call a Pro. ...

How to fix a noisy gas furnace?

What Does the Noisy Furnace Sound Like?

  • Vibrating or Rattling. Does your furnace make a rattling noise when it’s on? ...
  • Scraping. A grinding or scraping noise can sound like metal-on-metal. ...
  • Squealing. Not having enough lubricant can cause the fan belt to make a squealing, high-pitched sound. ...
  • Thumping. ...
  • Bangs or Pops. ...
  • Whistling. ...

How to fix furnace ignition failure?

What causes furnace ignition lockout?

  • Defective flame sensor. Defective flame sensors are one of the most common causes of lockouts. ...
  • Faulty igniter. The igniter is another frequently encountered lockout culprit. ...
  • Limit switch response. Your furnace also has a limit switch that monitors heat exchanger temperatures and fuel pressure. ...

How do you fix delayed ignition on a furnace?

Delayed ignition is usually caused by dirt or a minor fault. In most cases, a technician can solve the problem by performing some basic furnace maintenance or replacing a part. Others causes call for more extensive repair work. In a gas furnace, the air-to-fuel ratio may be off, making the gas hard to ignite.

Why does my furnace take so long to ignite?

While moisture and rust are one of the most common causes of delayed ignition in furnaces, dust and lint can also accumulate and cause problems. This can be easily remedied by having your furnace inspected and cleaned by professionals before each heating season.

Why does my furnace hesitate to start?

This behavior is caused by something cutting short each furnace cycle since your furnace is being forced into a short cycle to keep your home the temperature set on your thermostat. A furnace that is sized properly for your home should start and stop 3-8 times in an hour.

Can hear your furnace click on but it does not fire up?

This failing to ignite could be caused by things such as a damaged thermostat, defective wiring, or an ignition problem could be to blame. In some cases, there's trouble with the motor. A furnace that has trouble kicking on does not correct itself and needs service, by you or a hired technician.

What conditions can cause delayed ignition?

Delayed ignition is caused by moisture building up in the furnace over a period of inactivity. The moisture begins to corrode the firebox which blocks the ports that feed gas into the burners. Should the ports get blocked, the burners down the line fail to light promptly.

How do I clean my furnace ignitor sensor?

1:053:46Flame Sensor Cleaning - Furnace Cycling On and Off - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo if you have a situation like this what you have 90% of the time is just a dirty flame sensor. SoMoreSo if you have a situation like this what you have 90% of the time is just a dirty flame sensor. So we'll go through the steps on how to clean it. So the right side of the furnace.

How do I know if my furnace ignitor is bad?

Set a multimeter to the lowest possible resistance test and place the probes onto tips of the plug for the ignitor. If the multimeter shows infinity or stays at zero, the ignitor no longer works and must be replaced.

Where is the ignition sensor?

It's located on the burner assembly and is just a thin metallic rod. It's usually bent, and it sits just in front of the pilot flame inside the furnace.

Can a flame sensor be intermittent?

The flame sensor is a safety component that detects whether or not there is a flame in the combustion chamber. If this sensor is dirty, the dirt can cause the sensor to operate intermittently. When this happens, your furnace will most likely light, but because the sensor can't properly detect if a flame is present.

How much does it cost to replace a furnace ignitor?

Here's the bottom line: Whether for a natural gas furnace, oil, or a propane furnace, replacing a furnace ignitor–including parts and labor–will cost you around $300 – $425 for a qualified contractor to install. Compare that to, say, a draft inducer motor, which will cost $400 – $1,500 to replace.

What does delayed ignition mean on a furnace?

Delayed ignition is when that gas isn’t ignited immediately, allowing the gas to build up in the furnace.

Why is my ignition delayed?

But if you want to learn the lingo, delayed ignition can be caused by: Too much primary air— Primary air is the air mixed with the gas before it’s ignited. Too much primary air makes the gas-air mixture hard to light, causing gas to build up. The tech can easily fix this.

Why are delayed ignitions dangerous?

Why delayed ignitions are costly and dangerous. Several explosions by the delayed ignition can damage the furnace. It can also burn those trying to reignite the furnace pilot while extra gas is present (this is commonly called a “flash burn.”)

What happens if you delay ignition?

Delayed ignition can also result in the excess flames cracking the heat exchanger of the furnace (the most expensive part of the furnace) or allow the flames to roll out of the combustion chamber and result in a house fire.

What to do if gas furnace makes boom noise?

Alternatively, a precision tune-up and professional cleaning of your furnace can uncover symptoms that lead to this hazardous problem and address it before it has catastrophic consequences. If your gas furnace is making boom noises, give us call at 580-699-5662.

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