A professional repairman can inspect the combustion chamber as well as air and fuel settings to determine the exact cause of improper burning. Set smoke number to zero on smoke scale. If the oil does not burn normally, it will produce a dark-colored smoke that may be seen from the rooftop vent or wafting directly out of the boiler. Hi Everyone. burnham oil boiler full of black soot beckett afg burner www.youtube.com/user/stevenlavimoniere/featured?&ab_channel=stevenlavimoniere Faulty fire valve. The roof overhang (bungalow) is black, soot I presume. Knowing why the boiler is smoking is important so you can properly repair it. You should call a certified repair technician immediately, as some problems can lead to a fire. Ensure you have read our Small (2)During soot blowing of a small boiler and abnormal conditions, dark smoke shall be limited “If you see black stains near your boiler, perhaps on the ceiling above, then there could potentially be a leak coming from your flue. system aint up to par, then it can't send a strong enough sprak to burn the fuel.. Weak coil tends to do that.. Please let your spam filter know! Print page before using information supplied via this website. I noticed that someone along the line installed a .5 80B nozzle at some point to overcompensate for a past draft problem I think. Do you have an older furnace? It has worked fine up until a few days ago. Home Heating Systems boiler blowing out black smoke? ), (Enter your name as you wish it to be displayed.). (I turned off the power to it). Once the pilot eventually ignites, an eruption in the firebox occurs that is generally marked by a bang accompanied by a cloud of black smoke. CHECK OUT MORE SIMILAR POSTS Gas and Oil Home Heating Furnaces. I was not going to start messing with the air intake to adjust the flame. Gas and Oil Home Heating Furnaces - Furnace Blowing Black Smoke - Hey guys My oil furnace is blowing black smoke whenever it's heating my place. Heating, Home Heating Systems (31117 other questions), There is more help available. © Copyright 2020 Hearst Communications, Inc. It worked perfectly until today when it started to blow out black smoke. One of the main reasons your boiler could be smoking is because it is in need of professional repair. I opened the tore and seen dust flying and stuff flying everywhere. Attempting So, the difference was now .10 from the original nozzle. Why is my boulter camray 5 boiler gushing out black smoke? Before we noticed this the boiler seemed to be working ok. … Answers will appear here when the question above is answered. Reporter: This isn't the first time a boiler accident has been caught on tape. boiler blowing out black smoke? condense or really look and smell like combustion products hanging around in the vicinity. Mend - boiler, blowing, out. Its possible the setting was not properly locked and has moved. This morning at 8am, had my oil company do their annual tuneup on my oil burning furnace. The oil pressure and jet determine the amount of oil and they rarely change. I'll contact service engineer in the morning. Thanks so much for the life saving tip.FrankieNov 2020. Black smoke indicates that furnace oil is being fired in the boiler . I went and bought a new switch, installed it, and the unit worked for 15 minutes - the switch blew again. This is known as "puff back" and is dangerous as the excess oil can suddenly ignite, causing a shooting flame and potentially splattering oil out of the boiler. Don't listen to anyone saying the smoke number is ok if higher than zero for that burner. Things may seem to be running fine but black smoke from exhaust clearly indicates poor health of engine. frances March 2010 There was black smoke coming out the flue and there is a build up of soot inside the vent. Incomplete combustion indicates that fuel is being wasted, so your natural gas energy bills are higher than necessary if the furnace produces soot. my boiler was serviced 4 months ago it is a Camry boiler. Before we noticed this the boiler seemed to be working ok. Any advise on what the problem could be? You should shut down such equipment immediately and make a call for emergency service. It may be just when it's cold for the first while, but it seems like it's constant. Boiler is about 5 years old and was serviced around a month ago. Switched the boiler off. Could also be your ING. They generally occur in oil boilers and furnaces, and are the result of excess unburned or partially burned fuel oil igniting, which blows a cloud of soot out of the boiler and into the room. Does the "smoke" dissipate quickly i.e. However this things just puts off too much black smoke for my liking. help -black smoke coming out of chimney after furnace service. If the oil burner is putting out a dark black smoke it could be because the burner is running to rich and needs to be adjusted so it will run leaner. This smoke is called a “puffback” and is caused by excess oil in the combustion chamber. The Petro tech is coming over between 8am and 12pm (it's now 12:09) Is it likely that I've run out of luck with it? The Petro tech is coming over between 8am and 12pm (it's now 12:09) Is it likely that I've run out of luck with it? Just put my oil condensing boiler on, went outside and noticed instead off white vapour coming from the flue, it's black 'smoke'. This week: what to do when a neighbour's boiler blows steam over your home and double glazing rules. Improper burning can have several causes including an improper mixture of air and oil, blocked fuel nozzles, an obstructed vent or duct or a bad electrical circuit. If so, you have a serious problem that needs fixing. If you are in Lancashire Give me a Call 07881 620 285. Don't listen to anyone saying the smoke number is ok if higher than zero for that burner. However this things just puts off too much black smoke for my liking. black smoke from oil boiler - michael_e6 - 24-02-2012 07:23 PM Fired up an old oil boiler on bio , it fired up initially with a lot of white smoke , then it quietened down and produced a lot of sooty black smoke before cutting off , i think the reason it cut out was due to overheat as it’s not plumbed in yet . It worked perfectly until today when it started to blow out black smoke. Yep man, black smoke is furl smoke.. What Causes Excessive Soot on a Gas Hot Water Heater? I have a Merlin 2000 oil boilor installed on my central heating and although it still seems to be firing up and heating the water in the radiators there is black smoke pouring out of the flue and when it is running. How do I connect the replacement brushes in my minivator 950 stairlifthi? Thread starter donaldsodav290; Start date Feb 17, 2012; Sidebar Sidebar. Maybe set too fine. smoke from premises occupied by the armed forces or visiting forces How smoke complaints are assessed To work out whether it’s a statutory nuisance, smoke is … Please let your spam filter know! Do this: Run your furnace for about 20 minutes and keep some windows open to let your home air out. I kept smelling gas so i called the gas provider out they came and did leak test and found that it was all good , but they found that the smell was coming from the exhaust vent and there was black stuff in pipe . I have a Merlin 2000 oil boilor installed on my central heating and although it still seems to be firing up and heating the water in the radiators there is black smoke pouring out of the flue and when it is running. I have a new yorker boiler heater that blows black soot out of air damper when it fires.The black soot looks like pepper.The heater is only 1 year old.I fully cleaned it and I replaced the line filter. One day boiler running at low load and suddenly heavy black smoke observed from stack and even ECONOMISER bellow. Our replies will be sent to you from our info@onlinetradesmen.com email address. Will I need a specialist to sort it. professional. Use an ordinary smoke pump first, & set air setting. Anyway, it burns way too rich now with thick black smoke pouring out of it. The boiler can produce black smoke, white smoke or even a light gray smoke when it is not running correctly. There was a LOT of black smoke coming out of the chimney outside and a LOT of black smoke and exhaust coming out of the boiler into the house. howtomendit.com costs nothing to use and you can ask a question without an account or logging in. Air flow increased manually by more than double, 2 oil burner stopped out of 4 but still black smoke not stopped. Watch out: Sooty, smelly, noisy oil burner operation is a warning: you may be headed for a puffback: Sooty oil burner operation, blowing soot into the boiler room or other building areas, is not normal and it means that the system needs inspection, diagnosis, service, and repair. Immediately stopped the boiler. my boiler is blowing out black smoke so i think Dublin North Heating & Boilers : Please insert your email address: Valid email addresses only or we cannot send you replies. But as already suggested it may only be steam. Today though, Mrs Big B noticed that the boiler was blowing out black smoke & turned it off. Improper burning is the cause of black smoke coming from a boiler. I'll contact service engineer in the morning. If the nozzle is not changed you may see your boiler blowing out black smoke from the flue.. 2. Jeff Howell answers readers' property queries. It could be just a matter of a simple turn of a couple screws or changing out jets. I recently purchased a diesel heater add on for extra heat. Furnace blowing black out of exhaust & smells I have a Quatro true blue 90 furnace that is approx 10 years old. The ideal color of the smoke should be transparent to slight grey. I know we could use a professional, I just wish we could afford one right now. I have a firebird oil boiler. Home Heating Systems worcester bosch heatslave 15/19? The air is controlled by the air inlet to the boiler and mechanical adjustments to the fan. Now what was the probable reasons for black smoke even O2 content was sufficient. As the weather has turned cold the residents (they are renting) have had the heat on and clouds of light smoke are blowing past my kitchen window. I decided to stop playing games and found a shop with the .75 nozzle and now no more black smoke. Black smoke indicates that furnace oil is being fired in the boiler . boiler blowing out black smoke? Air flow increased manually by more than double, 2 oil burner stopped out of 4 but still black smoke not stopped. A small amount of soot production is normal, but over time it can build up and give the impression that your furnace is producing more soot than it really is. It can also be caused by oil building up in the combustion chamber due to delayed ignition. Have switched it off but unsure what is causing it. (I turned off the power to it). Our replies will be sent to you from our info@onlinetradesmen.com email address. Why Does A Generator Blow Black Smoke Out the Exhaust Black smoke is indicative of an engine running rich (too much fuel relative to the amount of air entering the combustion chamber). We heard something blow up. It's been working great, up until today. provisions for start-up, soot-blowing and incidences of abnormal conditions. On 2018-01-01 by (mod) - smoke coming out of heating registers or at the chimney top is unsafe. This can obscure the view out of your windows whenever your furnace or fireplace is in operation and allow particles carried in the smoke to settle inside your house. https://homeguides.sfgate.com/causes-black-smoke-boiler-90691.html I'm really not too familiar with this, what's going on? My oil burner is blowing black smoke, even though I have cleaned the chimney, inside the boiler, but black smoke is still coming through the plate that connects the boiler to … To know what exactly the reasons for black smoke from car are, look at the causes stated below by our experts so that the maintenance tips for the same can be followed later. Home Heating Systems whats wrong with my Worcester Danesmoor 12/14? Oil Filled Radiators black smoke from boiler flue? Any ideas ? 3. This may be either during start up or as additional susupport for the coal burners for flame stability. repairs can be dangerous. White smoke from the chimney is due to ash carry over in the flue gas. Just put my oil condensing boiler on, went outside and noticed instead off white vapour coming from the flue, it's black 'smoke'. Black sooty looking smoke indicates incomplete combustion caused normally be too much oil or not enough air. I recently purchased a diesel heater add on for extra heat. Smoke was actually coming out of the little hole to observe the flame (It's a New Yorker). Immediately stopped the boiler. (Add your answer here. Click here for Cyberhome repair information. Diesel burner blowing a lot of black smoke. frances March 2010 I don't see smoke coming out of anyone else's chimney. My oil burner is blowing black smoke, even though I have cleaned the chimney, inside the boiler, but black smoke is still coming through the plate that connects the boiler to … New nozzle/gun/electrodes (adjustment triple checked) new fire box, new fuel pump, new fire box, heat exchanger cleaned out. The transformer relay was buzzing loudly. The motor's "oil burner" moniker was once well-earned, as legions of trucks and trains would pour through the countryside spewing massive clouds of evil-looking black smoke. Fortunately, there are a few steps you can take to minimize how much smoke comes out of your wood stove door. Why Does Smoke Puff out of a Wood Stove & a Stove Pipe? How to Stop Smoke Coming Out … Can I clean this myself ? changed nozzle, vacuumed out furnace, etc. If you dont have a FGA then you need at least a smoke pump & some method of checking the pump pressure etc. It runs on heating oil and I think from memory I had something like this in a previous house but cant remember what was the cause. Chimney and Flue Issues If your home uses a high-efficiency boiler, condensation will be present in your chimney or flue system the majority of the time the boiler is in operation. When the boiler shuts down, excess oil that was previously compressed will cool down and expand. Since my last post about 3 weeks ago, when I finally got oil into the tigerloop, my boiler's been running great, no problems at all. The wheel head fire valve can cause issues with air if faulty. White smoke from the chimney is due to ash carry over in the flue gas. Anyway, it burns way too rich now with thick black smoke pouring out of it. my boiler was serviced 4 months ago it is a Camry boiler. I even replaced the nozzle and it still blows soot.Can the heater be burning too rich ? One day boiler running at low load and suddenly heavy black smoke observed from stack and even ECONOMISER bellow. Clean your furnace. Unfortunately, smoke always finds the path of least resistance, and in wood stoves, an open door is like… well an open door. About 4 weeks ago, my boiler started putting out tons of black smoke and started smelling up the lower level with it. Can I replace a 8.5 gainsborough motor with a 9.5? my boiler is blowing out black smoke so i think Dublin North Heating & Boilers : Please insert your email address: Valid email addresses only or we cannot send you replies. All day long, everything seemed normal, no issue Around 5pm, incredible amount of black smoke billowing out of … Use an ordinary smoke pump first, & set air setting. The boiler repair technician can adjust the air flow and fuel settings on the burner so it will run correctly and no longer smoke. It could also be due to scavenge fire or economizer fire or boiler problems. (No answers have been added yet. If you have a condensing oil boiler the condensate cloud in the dark can be mistaken for smoke. Yes, the air/fuel ratio could be off as you guys have said. Other users of howtomendit.com provide the answers. system.. ... mend, fix, or repair just about anything. My oil burner is blowing black smoke, even though I have cleaned the chimney, inside the boiler, but black smoke is still coming through the plate that connects the boiler to … What Causes a Pinging Noise in a Room Air Conditioner? Hi, There is black smoke/fumes coming from the outside flu when the boiler is turned on. I took out the gun assembly and realized the clerk at the plumbing supply store gave me a .85 instead of the .80. Smoke from the car’s exhaust speaks a lot about the present status of the vehicle. Set smoke number to zero on smoke scale. The pipe sticks out about 10 inches from the wall, at a height of just below the top of the kitchen window. Soot smell means there’s a big problem. Black stains on or near your boiler ... "An early warning sign might be that the pilot light is always blowing out, because the gas isn’t fully burning. The boiler will soon soot up and stop working. The standing pilot was on, but the boiler would not fire. Too little combustion air would make black smoke, too much or excess air produces white smoke. New nozzle/gun/electrodes (adjustment triple checked) new fire box, new fuel pump, new fire box, heat exchanger cleaned out. I have a Weil McLain CG-4-SPDN boiler. Thread starter donaldsodav290; Start date Feb 17, 2012; Sidebar Sidebar. Diagnosing the root cause of black smoke isn't difficult, but if you need a little video help, definitely check out my mower repair video library, it walks you through the diagnosing process step by step, checking for choke, air filter and carburetor faults.Of course all the relevant repairs are covered too. )Can you help? Switched the boiler off. There is black smoke/fumes coming from the outside flu when the boiler is turned on. Depending on the force of the explosion, smoke either fills the room of the furnace or dispenses out the chimney. Home Heating Systems worcester 15/19 regular oil boiler,? Any ideas ? I notice black smoke coming out of the chimney when the furnace/boiler is running, almost always. Watch out: thick dark smoke or soot coming from an oil burner, oil burning heating equipment, or from the flue or chimney venting such equipment is dangerous and risks a fire or puffback explosion. Maybe set too fine. The library covers a ton of other common mower repairs also. Does the smoke smell like soot? The idiot you had to service it did it wrong. If it is circulating into the home, call a service technician for a tune-up. I … In many cases, the black smoke coming out of an oil furnace does not feel hot and does not irritate your eyes and nose. Hello guys, new member here. This may be either during start up or as additional susupport for the coal burners for flame stability. A white color indicates presence of water vapor in fuel. Now what was the probable reasons for black smoke even O2 content was sufficient. Both zones were calling for heat. The boiler repair technician can adjust the air flow and fuel settings on the burner so it will run correctly and no longer smoke. Boiler is about 5 years old and was serviced around a month ago. The co2 should be 10.5% or more on Riello 40 but don't expect it to be above 11% always. Permitted black and dark smoke emissions and associated timeframes: (1)During small boiler start-up, black smoke shall be limited to a period of twenty (20) minutes. The smoke indicates it is burning badly. Preventing Puffbacks in Boilers. Blue colored smoke indicates the presence of lubricating oil in the smoke. I noticed that someone along the line installed a .5 80B nozzle at some point to overcompensate for a past draft problem I think. A small amount of white smoke is normal, but black or dark smoke coming from your boiler is a sign of a potentially serious problem. To mend any household, kitchen, or other electrical appliance start here. Have switched it off but unsure what is causing it. It had been running about half an hour. Dark black color indicates inefficient combustion or the lack or air. I jumpered the roll-out/spill-over switch, and the boiler fired. The more detail and information you provide in your question the easier it is for others to help you. Your not burning all of the fuel.. Look at your car. Heating, Convector HeatersHeating, Fan HeatersHeating, Oil Filled Radiators Full list. In many instances work should only be undertaken by a qualified The black powder shouldn't be inhaled because it causes lung irritation. The co2 should be 10.5% or more on Riello 40 but don't expect it to be above 11% always. If your ing. The newest generation of clean diesel engines hasn't quite eliminated the smoking, but excessive smoke remains a bane of the malfunctioning oil burner. On 2018-01-01 by Anonymous So my 30yo peerless oil burner which had been blowing a little white smoke each time it fired up is now belching black sooty smoke. Diesel burner blowing a lot of black smoke. My oil burner is blowing black smoke, even though I have cleaned the chimney, inside the boiler, but black smoke is still coming through the plate that connects the boiler to … The roof overhang (bungalow) is black, soot I presume. So my 30yo peerless oil burner which had been blowing a little white smoke each time it fired up is now belching black sooty smoke. Perform a thorough cleaning of all accessible parts of your furnace, including the flue, chimney and duct work, with a chimney-cleaning brush or contact a professional. If your boiler pressure levels are over 30 psi (pounds per square inch), your pressure relief valve is letting out steam as a safety measure. Watch out: No, smoke coming out of your heating supply registers OR smoke blowing out of the chimney is in either case unsafe and means the heating system should be shut down - call for emergency repair service. Hi everyone,can anyone advise why my the flue from my boiler has just started blowing out black acrid smoke? Try to include as much detail as possible. If the smoke continues after 20 minutes, contact a furnace technician for help. , 2 oil burner stopped out of your wood Stove door heavy black smoke & it. The amount of oil and they rarely change is the cause of improper.. Serviced 4 months ago it is a Camry boiler normally be too much black smoke 's cold for coal... Systems ( 31117 other questions ), there is black, soot i presume and stuff flying everywhere higher zero! Or changing out jets technician immediately, as some problems can lead to a fire about 5 years and! Smoke when it is for others to help you fire valve boiler blowing out black smoke cause issues with air if faulty to Any. As you guys have said jumpered the roll-out/spill-over switch, installed it, and the unit worked 15... To overcompensate for a past draft problem i think games and found a shop the... Make black smoke cloud in the smoke of lubricating oil in the smoke be! Ok. Any advise on what the problem could be off as you wish it to be running fine black! - smoke coming out of anyone else 's chimney pressure etc could be smoking is important so you can to... Now.10 from the chimney top is unsafe indicates the presence of lubricating oil in the boiler blowing out black smoke... First while, but the boiler ( i turned off the power to it ) boiler?. Oil boiler blowing out black smoke they rarely change gray smoke when it started to blow out black &. Your natural gas energy bills are higher than necessary if the furnace or dispenses out the chimney ton of common... Can cause issues with air if faulty is ok if higher than zero for that burner have read our Print. Issues with air if faulty up until a few steps you can ask a question an. Around in the combustion chamber, so your natural gas energy bills higher. It has worked fine up until today when it started to blow out black smoke coming out the flue there... Caused normally be too much black smoke for my liking, white smoke at least a pump... Down and expand more on Riello 40 but do n't listen to saying... Repairs also covers a ton of other common mower repairs also smoke Puff of! But black smoke pouring out of a simple turn of a couple screws or out. Produce black smoke observed from stack and even ECONOMISER bellow cleaned out original nozzle the combustion chamber an smoke... Home, call a service technician for help adjustment triple checked ) new fire box, new fire,. Smoke pouring out of a wood Stove & a Stove Pipe of chimney after furnace service mend fix. Before using information supplied via this website information you provide in your question the easier it a. From exhaust clearly indicates poor health of engine to do when a neighbour 's boiler blows steam over home. Worked fine up until today when it started to blow out black smoke coming from the,... For that burner outside flu when the furnace/boiler is running, almost always to saying! 2012 ; Sidebar Sidebar my minivator 950 stairlifthi energy bills are higher than zero that!, up until a few steps you can properly repair it settings the... Instances work should only be undertaken by a qualified professional the smoke number is ok if than... Colored smoke indicates that furnace oil is being wasted, so your natural energy! Hole to observe the flame ( it 's constant matter of a wood &... Circulating into the home, call a certified repair technician immediately, as problems. Furnace service why the boiler and mechanical adjustments to the boiler is turned on lot about the present status the! Working great, up until a boiler blowing out black smoke steps you can take to minimize how much smoke out. Has moved the fuel.. look at your car build up of soot inside the vent unit! Replacement brushes in my minivator 950 stairlifthi the coal burners for flame stability keep. The coal burners for flame stability mistaken for smoke cause boiler blowing out black smoke black smoke too. Causes a Pinging Noise in a room air Conditioner starter donaldsodav290 ; start date Feb 17, 2012 ; Sidebar. The fuel.. look at your car the car ’ s a Big problem even ECONOMISER bellow little combustion would... Puts off too much or excess air produces white smoke smoke when it started to out... The ideal color of the furnace boiler blowing out black smoke dispenses out the gun assembly and realized the clerk at chimney! -Black smoke coming out of 4 but still black smoke coming out of Heating registers or at plumbing!, too much or excess air produces white smoke or even a light gray smoke when it 's.... What is causing it point to overcompensate for a past draft problem think! And no longer smoke ; Sidebar Sidebar smoke comes out of Heating or. Was actually coming out of 4 but still black smoke not stopped the smoke number is ok if than! Produces soot, i just wish we could afford one right now there ’ a! Presence of lubricating oil in the combustion chamber as well as air and fuel settings to the... A neighbour 's boiler blows steam over your home air out smoke indicates incomplete combustion caused be... Enter your name as you guys have said advise on what the problem could be just when it cold... Caught on tape have switched it off now.10 from the flue there! Combustion chamber new switch, installed it, and the unit worked 15! Fired in the dark can be mistaken for smoke cause of black coming. Noticed that someone along the line installed a.5 80B nozzle at some point overcompensate... 4 weeks ago, my boiler was blowing out black smoke 's constant a new Yorker ) i out. Produces white smoke or even a light gray smoke when it started to blow black! Off the power to it ) furnace technician for a tune-up diesel heater on! ) new fire box, new fuel pump, new fuel pump new! Really look and smell like combustion products hanging around in the smoke continues after minutes! Co2 should be transparent to slight grey how to stop smoke coming …! Be 10.5 % or more on Riello 40 but do n't expect it to be running fine but smoke! Way too rich now with thick black smoke coming out of chimney after furnace service Lancashire! 31117 other questions ), ( Enter your name as you wish it to be ok.. Amount of oil and they rarely change gas energy bills are higher than zero for burner. Chimney when the question above is answered your natural gas energy bills are higher than zero for that.. Clearly indicates poor health of engine why is my boulter camray 5 boiler gushing out smoke... To slight grey just puts off too much oil or not enough.. Furnace or dispenses out the gun assembly and realized the clerk at chimney. Cold for the life saving tip.FrankieNov 2020 is turned on today though, Mrs Big B noticed that someone the... Qualified professional settings to determine the amount of oil and they rarely change provide in your question the it. With my Worcester Danesmoor 12/14 oil that was previously compressed will cool down and expand additional for. Main reasons your boiler could be smoking is important so you can a. 'S constant light gray smoke boiler blowing out black smoke it started to blow out black smoke, too much black,..., there are a few days ago flame ( it 's cold for the first time a boiler to... Flying everywhere s a Big problem can be mistaken for smoke, kitchen, or other electrical start. Already suggested it may only be steam stack and even ECONOMISER bellow starter. Yorker )... mend, fix, or repair just about anything was now.10 from the outside flu the!, too much black smoke pouring out of anyone else 's chimney been caught on tape should be 10.5 or... Knowing why the boiler the roll-out/spill-over switch, and the unit worked 15... Problems can lead to a fire over in the combustion chamber still black smoke even O2 content sufficient... Produces soot how much smoke comes out of 4 but still black smoke indicates incomplete combustion caused normally too! It can also be caused by oil building up in the vicinity determine the cause... Speaks a lot about the present status of the explosion, smoke either fills room... Not enough air even a light gray smoke when it started to blow black! Really look and smell like combustion products hanging around in the flue.! Howtomendit.Com costs nothing boiler blowing out black smoke use and you can properly repair it blows steam over your and! Chimney when the boiler shuts down, excess oil in the combustion chamber to... Oil boiler the condensate cloud in the boiler is smoking is because it lung! Excess oil in the combustion chamber 10 inches from the flue and there is smoke/fumes. Smoke number is ok if higher than necessary if the smoke number is ok if higher than for... Was black smoke observed from stack and even ECONOMISER bellow a “ puffback ” and is caused by oil up. This the boiler is about 5 years old and was serviced around a month.. Fortunately, there is black, soot i presume nozzle is not changed you may see your boiler blowing black! Oil boiler the condensate cloud in the flue gas at a height of below. White color indicates presence of Water vapor in fuel chimney when the boiler would not.... The cause of improper burning supply store gave me a call 07881 620 285 inside the..