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There are 2 common causes of this bang noise: Delayed ignition Expanding air ducts To know which is the problem, determine where the loud noise originates from. If the noise originates a few feet away from the furnace when the blower turns onthe problem may be expanding air ducts.
Delayed ignition Imagine a room full of gas and then someone decides to light a match. Big problem, right? 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. See how a furnace works. But a variety of issues can delay the combustion of that gas.
So the gas builds up in the furnace until—BOOM—it ignites, causing a mini-explosion. This can harm the heat exchanger, which is very expensive part to replace. But what causes it? Usually, too much static pressure in the ductwork. Causes of high static pressure include: Undersized ducts Closed supply vents Dirty air filter—especially dirty, 1-inch pleated filters So what now? Are you in our service area?
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Service Area View Details. Schedule Service We can't wait to take care of you. Hours of Operation Monday - Friday: 7am - 7pm.When the furnace starts up it makes a large swoosh sound and is very loud while it it on. Seems to be heating fine and shuts off fine. How can I fix this problem?
I heard a loud pop from basement. Checked power in its alive so something inside popped and now there is no power. My furnace, when the motor first turns on, makes a really loud vibrating noise.
It seems like the blowers start, the noise lessens in volume. It has been loud for a number of weeks, and finally yesterday I went downstairs to see if anything was loose, but didn't see anything. Any thought from My 25 year old home needed new furnaces. The main floor is about sq ft and the upstairs sq ft.
There is 2 HVAC systems, one larger than the other. We also got new compressors and About 2 months ago we turned our AC on for the first time this year. This doesn't happen when we have the Heat on, and it didn't happen Remember Me? Find questions to answer Find today's questions Find unanswered questions. Search Topics. Login Not a member?
Join our community. Carmelo Posts: 1, Reputation: 1. Nov 6,PM. Greetings this is my first post. I'm having a problem with a Weil McLain furnace that is probably 50 years old. It was running fine till last week when I went to start it up.Especially in areas with limited access to natural gas, oil-burning furnaces provide economical heat and rely on a renewable resource.
They generally accommodate retrofits to update their efficiency. Perks aside, these traditional appliances are susceptible to occasional -- and potentially dangerous -- hiccups known as backfires or puffbacks.
Knowing the cause of these misfires is only half the battle; knowing how to prevent them and how to respond to them is equally important. Essentially, backfires occur when your oil furnace misses ignition: If the burner doesn't ignite as intended, atomized oil fumes can build up; when ignition finally occurs, the fumes typically cause a small explosion.
In some cases, the issue occurs when debris builds up in the furnace, leading to an explosion of collected atomized oil. These puffbacks happen most often during the winter season, resulting from a dirty filter, a faulty valve or, in the most expensive cases, a bad oil burner.
Typically, the backfire is accompanied by low thudding sound from the appliance, but sometimes a large explosive blast big enough to knock down the flue pipe occurs.
An oil-burning furnace with a leaky seal may throw improperly atomized oil into the furnace's combustion chamber, which eventually pools at the bottom of the chamber. The pools partially vaporize. They ignite when the furnace cycles on, causing an explosion.
One of the burners in my furnace is back-firing... fix or replace?
Similarly, a variety of other circumstances -- dirty or damaged rotary cup burners on old-fashioned furnaces, improper fuel or water in the fuel, a dirty stack switch, failing sensors, faulty electrodes -- can lead to a combination of improperly atomized oil and delayed ignition, which combine to cause a backfire.
Although different causes lead to backfires, the effects are largely the same. Upon misfire, your furnace releases an oily odor and a large discharge of black or gray soot through the furnace's exhaust system or, if your home features a forced-air system, your heating system's vents. If the blast is severe enough, it can burst the sealed exhaust and send soot and smoke into your living space.
In the latter two scenarios, the expelled soot can cover your walls, floors, fixtures, furniture and everything in between.
After a backfire occurs and you've taken the appropriate safety measures, dispose of any exposed food and machine-wash any fabrics you can. To cover the rest, you'll have to enlist the help of a specialized cleanup crew to restore the affected space and hire a climate-control professional to repair your furnace. If a backfire occurs in your home, equip yourself with a mask, turn off the furnace's electrical and oil supply, and ventilate your home thoroughly.
Avoid lingering in the area until it has been thoroughly cleaned of soot, as the smoke and soot contain carcinogens. In some cases, the initial explosion may cause small flames due to burning oil droplets. You can treat these fires with a foam fire extinguisher to prevent a structure fire, but always prioritize your safety, and contact your local fire department immediately if the backfire results in a fire in your home.
Prevention is your best weapon against furnace backfires. Regularly dust your oil-burning furnace and hire a certified climate-control technician to inspect and service your appliance once per year. Likewise, contact an climate-control professional if you spot any soot near the furnace, if the appliance puts off an oil-like odor or if it emits any unusual noises during operation.
Dan Ketchum has been a professional writer sincewith work appearing online and offline in Word Riot, Bazooka Magazine, Anemone Sidecar, Trails and more. Dan's diverse professional background spans from costume design and screenwriting to mixology, manual labor and video game industry publicity.
Skip to main content. Home Guides Home Home Improvement. They can coat your home in soot. Atomized Explosions Essentially, backfires occur when your oil furnace misses ignition: If the burner doesn't ignite as intended, atomized oil fumes can build up; when ignition finally occurs, the fumes typically cause a small explosion.
Other Causes An oil-burning furnace with a leaky seal may throw improperly atomized oil into the furnace's combustion chamber, which eventually pools at the bottom of the chamber.Heater Delayed plustorosstocktwits.pw
The Effects Although different causes lead to backfires, the effects are largely the same. Safety Measures If a backfire occurs in your home, equip yourself with a mask, turn off the furnace's electrical and oil supply, and ventilate your home thoroughly. Preventing Problems Prevention is your best weapon against furnace backfires. References 5 Energy. Gordon, Inc. Customer Service Newsroom Contacts.Forgot your Password?
Thread Tools. Now in the morning it starts up great but about every 5th cycle it backfires on start-up, enough to blow out the pilot light this morning. The burners are clean with a nice blue flame and I installed a new filter. This intermittent problem is driving me crazy. Any ideas? View Public Profile. Find all posts by 11thACR. Received Votes on Posts.
Find all posts by PJmax. I vacuumed the burners out a week ago and that made a big difference in operation. In the morning when I turn up the t-stat you can barely hear the furnace start. It cycles off and on fine for several cycles before it decides to backfire again. I can try cleaning it again. Any other ideas? Especially near the pilot and the crossover area where the flame goes from burner to burner.
I think you nailed it Pete.If you have found this section of the web site you are probably experiencing difficulties in getting the burner system to stabilize. Or perhaps you are experiencing burner pop-back. Others are prudently looking ahead to ward off any possible difficulty, "to head them off at the pass," so to speak. This is the page where we talk about a seemingly puzzling situation called "pop-back" or "pre-ignition" or sometimes called "burn back".
We begin by showing what is a stable situation of ongoing combustion. Pictured here is an environment glory hole or furnace which is burning in a stable manner.
The flame has a blue core, the environment is at working temperature, and the burner head and mixer are cool and could pass the touch test. Even the face of the head is relatively cool because of all the combustibles cool air and gas which are being pushed through it. The flame is burning quietly, but steadily. This is a happy burner system. In contrast, this next image shows a burner system with burner pop-back.
This is a condition where the mixture of gas and air are burning in the mixer and head area of the burner system. If this condition goes on for a while, the head and pipe work may become cherry red.
When the system is shut off and naturally left to cool for a few minutes, it most often can be re-lit and everything is fine. But sometimes there is damage to the pipe and head. An inspection of the head will reveal if there are any serious cracks, and if so the head should be repaired or replaced. If this furnace had a safety system it would have shut down immediately when the flame began to rumble or flutter. Such a safety system could be hooked to an alarm to notify you of any burner or furnace abnormality.
Here is a list of conditions that help identify this condition. One day a glassblower makes a new melt and really gives it the business, gets the furnace really hot, and on the down side he is in a hurry and wants to plane it off because he has a hot date in a couple of hours. He turns it down to a setting which normally works when the furnace is a bit cooler and off he goes to visit his 'sweety.
When he comes into his shop the next morning a sense of panic overcomes him. The furnace is roaring and the pipe work near the burner is red hot. The head is perhaps broken. He did not have a safety system. And he is indignant!
I knew it wasn't any good before I put it on! I saw some air bubbles in it. I think it was defective. That's when I get a call from Mr. It takes me awhile to get Mr. I don't know about the date thing, but we can get the furnace turned down ok. The burner and the burner port are affected by this heat increase, meaning they get hotter.
And things are generally fine until the turn-down.
That's when the red line can move nearer to the inside of the head. It is sometimes a thin line.Forgot your Password? We welcome your comments and suggestions.
What Are the Causes of the Backfire of an Oil Burning Furnace?
Thread Tools. One of the burners in my furnace is back-firing.Visions of n zoth crystals
I recently bought this home and it's around 20 years old. There are 4 burners in this furnace and 2nd or 3rd from left back fires few times before it finally starts burning.
When it back fires, it makes loud noise against the metal cover like someone's banging on it. Is this serviceable or time to replace? View Public Profile.Safe move greedy algorithm
Find all posts by Mystery It could be a matter of cleaning of the burners. If you are handy, I'd give that a try. Sometimes the cross overs between can get lint on them. If it still does it after that, might be time to consider calling a pro in. It's going to get worse before it heals itself. Find all posts by tinmantu.Cz 97 b thin aluminum grips
Thanks for comments. How to clean and what to use?What is delayed ignition? The gas keeps building until—BOOM—it reaches a flame and finally ignites, causing a small explosion in your furnace. Imagine being in a room filled with gas and someone decides to light a match or you turn on the burners to your gas grill and hesitate a moment before pushing the ignite button.
There are a variety of possible issues, all of which need a professional technician to solve. Too much primary air makes the gas-air mixture hard to light, causing gas to build up. The tech can easily fix this. Too little gas at the burners —Like too much air, not enough gas makes it hard for the gas-air mixture to ignite. This is can be caused by low gas supply pressure. Dirty, restricted or weak pilot light —If you have an older furnace, this may be the problem.
These pilot light issues prevent the main burners from igniting. There are a ton of other causes like misaligned or dirty burnersbut you get the idea.
Why delayed ignitions are costly and dangerous Several explosions by the delayed ignition can damage the furnace. 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.
You could get hurt.
Why Does My Furnace Sound Like It’s Backfiring? Ask an HVAC Expert
Call a Lawton, OK heating company that knows their stuff. Contact Pippin Brothers to repair your furnace if you feel you are experiencing this problem.
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. Contact us for more information. Skip to main content. October 28, If your house is uncomfortable; wasting energy; has plumbing problems or if you want to avoid breakdowns or verify everything in your home is working as it should, give us call at We've already helped many of your neighbors, and would be honored to help you.
Still Having Issues? Pippin Brothers can get your furnace back on track.
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