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Flame burning too orange

Flame is burning too orange, and causing black smoke marks on the outside walls

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You need to get a Plumber or Appliance Tech to come out immediately and check the fuel to air ratio. You are not burning your fuel at the proper mixture. A blue flame is good, yellow-orange is bad.

Normally this is because the burner area is dirty or the pressure regulator may be set too high/low. The black marks are a sure sign that your ratio is too rich and it's just going to build up more soot and become unhealthy and dangerous.

http://inspectapedia.com/plumbing/Gas_Flame_Noise_Defects.htm
Don't wait...

Posted on Jun 08, 2014

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Posted on Jan 02, 2017

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SOURCE: Black soot on outside wall

All gas water heaters, tankless and tank-type, require cleaning burner and combustion parts.
Tankless manuals suggest once per year.
Tank-type once every 2-3 years.
Before calling service technician, open following links for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/TWH-G1-13_Removing_and_cleaning_burners.pdf
Burners do not operate cleanly:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/125BOTechSupport/Troubleshoot/tabid/602/Default.aspx

Posted on Jun 27, 2011

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1 Answer

Flame burning too orange


You must get more air to water heater, and check venting .... immediate CO poison danger.
Call qualified plumber immediately.... because deadly carbon monoxide is not being vented properly.
http://waterheatertimer.org/Water-heater-safety-precautions.html#soot

Gene h

Mar 27, 2014 | Water Heaters

1 Answer

Black smoke coming out of exhaust


1) Danger. Sooted smoke indicates incomplete burning of gas, clogged air intake, dirty combustion parts, bad vent, and lazy yellow flame, and absolute danger of fire or explosion of unburned gas in flueway. Call for service immediately.

2) Add comment and include more information about brand, type and model of unit. And include if this is gas fireplace, gas water heater, stove etc. For more possible help.

Feb 20, 2013 | Bosch Water Heaters

1 Answer

When I try to light the pilot, the flame light at the small hole on the outside on the pilot burner


You have a plugged pilot orifice. That small hole is basically an air intake for pilot when working properly, and when it gets a spider web or something in it, the pilot flame will burn rich (orange/yellow). When pilot orifice is plugged, that"s the next closest place for propane to escape, thus, flame . You need to either blow compressed air in to pilot tube end where flame is normally at, and hope it cleans debris out, or use a 3/8 and 5/16 wrench and disconnect pilot tube from end and remove orifice in pilot assy, and make sure small pinhole is cleared in center of orifice. Be careful when removing tube, as it is aluminum and can crack very easily, especially if older. The best thing to do would be to stop at RV store and get a new pilot tube and thermocouple assy, and install new. Not very expensive, and troubles should be over for years to come with regular servicing. New assy, comes with new orifice etc.

Sep 13, 2012 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

Kenmore Water heater, Model # 153.339462, Pilot lights, burner burns for approx. 10 - 15 minutes then both go out. after which it is more difficult to light the pilot. I need ideas please


Clean combustion parts, clean air intake, get more air to water heater and see if problem continues.
Look at color of burner flame and pilot flame: if flame has yellow-and-orange instead of clear blue flame, then combustion parts need cleaning.

Pilot and burner problems can be caused by bad thermocouple, thermocouple not sitting in flame, weak pilot flame due to dirty tube or low gas pressure, air in gas line, no draft up vent, backdraft coming down vent, dirty combustion parts, clogged air intake, insufficient air, insufficient air quality, hot attic, bad gas control valve, etc.

Open following link for pdf resources, and illustrations for cleaning combustion parts, and some service manuals:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

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Sep 03, 2011 | Water Heaters

1 Answer

I have an Atwood hot water heater in a Bounder motorhome. When I turn on the switch to fire up the electronic ignition, it instantly blows the 12v fuse. An inspection of the unit shows wiring with melted...


My guess is that you may have or have had a spider web or other debris in burner tube that caused flame to back up, thus burning some wiring but, have someone experienced check it and clean it. The wiring if not burned too bad may be able to be repaired/spliced.

Jul 03, 2011 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

Black soot on outside wall above hot air exhaust. Excess flame, incomplete combustion? How to adjust/correct?


All gas water heaters, tankless and tank-type, require cleaning burner and combustion parts.
Tankless manuals suggest once per year.
Tank-type once every 2-3 years.
Before calling service technician, open following links for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/TWH-G1-13_Removing_and_cleaning_burners.pdf
Burners do not operate cleanly:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/125BOTechSupport/Troubleshoot/tabid/602/Default.aspx

Jun 26, 2011 | Bosch 125BO NG AquaStar Outdoor Natural...

1 Answer

I have an orange flame on the burner instead of blue


The difference between an orange flame and blue flame is the amount of air in the combustion process. SO if the flame is orange it is being starved of oxygen. The gas burns dirty and soot is generated.

Sometimes with an older heater the exhaust venturie becomes plugged and carbon monoxide is released into your home- in this case your heater would make a woof or poping sound when starting up or shutting off. This is a dangerous unsafe situation and professional help is needed.

What you can do is try to make adjustment yourself, if your confident the other situation does not exist. Your water heater should have a little deflector shield on the gas line between valve and burner (typically immediatly after the orfice). Sometimes these will have to be slide front or backwards or twisted. The adjustment of deflector shield must be opened more to make the blue hotter flame to mak eyour heater operate at peak efficiency.

Good Luck

Jan 03, 2011 | Whirlpool Water Heaters

1 Answer

My pilot flame is too high . What could be causing this ?


If it's an Atwood and just recently started burning a yellow, higher flame, look closely at side of fitting where the pilot tube is attached to mounting bracket. You should see a very small hole in the side of that fitting. Take a paper clip, or something as small in diameter, and poke around inside that hole to clean it out, or shut pilot off, and use compressed air, to blow into it, to clean it out. Now re-lite your pilot and see if you have a nice blue flame now. That little hole is your air mixture for the pilot and sometimes debris clogs it, thus causes (rich mixture) yellow/red flame, which will also cause soot build-up in the chamber, or even on outside cover. Let me know if that cures it.

May 09, 2010 | RTO Atwood Water Heater - 6 Gal LP

2 Answers

Bosch SX 250 tankless water heater will attempt to fire 3 times then EA code. I have spark through viewing window. Read troubleshooting manual. Says Check ionization electrode. There is no part in the...


This is also known as a flame rectification sensor. It basically is what the computer board uses to detect if the pilot flame is lit. When it makes an attempt to fire is there any evidence of flame ignition? This error does not mean that the sensor is bad for sure. The error could be caused because the water heater is only making three attempts to fire and then shutting down. These water heaters are very complex and have many sensors,valves, ect that are all controlled by a computer board. Some of the basic things to check for are... Make sure that you have plenty of gas pressure. These units have a built-in pressure switch and will have issues if they are starved of gas. Most of these tankless water heaters are up to 400,000 btus and a half inch gas line or undersized connector won't work well. You can also check and make sure there is no pipe dope are debris stuck in the screen inside the gas line where it enters unit. Inspect the pilot assembly for debris or obstructions and try to blow out with compressed air. Also look for any loose electrical connectors on the board or to the sensors...one may have come loose.

Sep 07, 2009 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

Furnace filter is black and sooty wall seem to be sooty


   By sealed unit you mean that the burner air comes from outside of the house?      You have checked the heat exchanger for cracks by removing the burners and looking with a mirror and flashlight, correct, or had a service tech so?
The furnace burners have enough air and are burning clean (blue) with just a tip of orange at the end? You bought the house new and the fireplace has never been used?  If it has been used to clean smoke for the house for whatwever reason I woudl start by havign the ducts cleaned.   Another possibility I have seen is insolation inside of ductwork breaking down.   

Jan 28, 2009 | RTO Home Heating Products 5.5HH240...

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