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- Thread starter yaserg
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- gas engineer
Its strange right enough , your engineer will find out if its a pressure problem , i mean yellow flame is incomplete combustion , a bad mix of gas and air, so one of the 2 is wrong , are all burners like this, all 4 rings yellow , how big is the room the hob is in , and is there a door or openable window ?
Update:
The bosch guy came this morning. He had a look and was puzzled as well. He looked at all 4 burners and all of them had blue and orange flame.
He cleaned it and still the same. he checked the pressure and it was 21 which he said was spot on.
He said if the carbon monoxide was being produced both the alarms would pick up ( i have them right next to the hob). He turned off the boiler but still same flames.
His thinking was that as the flames change back to completely blue late afternoon it might be pressure change but when he measured it it was all ok.
So he said he will speak to his technical department and get back to me.
The bosch guy came this morning. He had a look and was puzzled as well. He looked at all 4 burners and all of them had blue and orange flame.
He cleaned it and still the same. he checked the pressure and it was 21 which he said was spot on.
He said if the carbon monoxide was being produced both the alarms would pick up ( i have them right next to the hob). He turned off the boiler but still same flames.
His thinking was that as the flames change back to completely blue late afternoon it might be pressure change but when he measured it it was all ok.
So he said he will speak to his technical department and get back to me.
- May 23, 2015
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- Heating Engineer (Has GSR)
Normally, that kind of colour change ( I'm looking at the photos of course and not in the flesh ), would be caused by a slight reduction in combustion air, (or maybe an increase in pressure), or something else present which shows up the outer mantle of the flame, / makes it more luminous. Kozak above has mentioned nebulisers and I know you said no to that but is there anything else that you do in a morning that may effect it ?
I am intrigued with this post , I have not got a bloody clue , but cant wait untill we have the answer .
Another possibility is that Transco is allowed to vary the CV of the gas it supplies by range of about 15%.
Transco's CV webpage
If your hob was commissioned at at time when it was at the low end of the range and it was jacked up by Transco a week ago maybe...
If you're sure you haven't changed your habits, the change suddenly started happening on a specific day a week or so ago, and Bosch have checked the hob then maybe the finger of suspicion should begin to point at what's coming out of the gas main.
Transco's CV webpage
If your hob was commissioned at at time when it was at the low end of the range and it was jacked up by Transco a week ago maybe...
If you're sure you haven't changed your habits, the change suddenly started happening on a specific day a week or so ago, and Bosch have checked the hob then maybe the finger of suspicion should begin to point at what's coming out of the gas main.
I am intrigued myself. Even the Bosch guy was. Still waiting to hear back from him and his technical department. He said long shot but might be there is some water in main gas and causes orangy flame in the mornings and as it burns away or dries up back to normal?
Today the flame was orange earlier around 6.30. I usually don't use the hob weekday mornings , only on the weekends but since last week have been keeping an eye on the timings.
There is no change in our habits and no new utensils etc. There was one video on youtube who said inked to humidifiers but I dont even have that downstairs. Perhaps its the humidity in the kitchen?
lets see
Today the flame was orange earlier around 6.30. I usually don't use the hob weekday mornings , only on the weekends but since last week have been keeping an eye on the timings.
There is no change in our habits and no new utensils etc. There was one video on youtube who said inked to humidifiers but I dont even have that downstairs. Perhaps its the humidity in the kitchen?
lets see
The inlet gas pressure at the meter needs to be measured when both the boiler and the hob are operating at full rate only a GSR or the gas supplier can do this , then it also needs to be measured at the appliance inlet aswell the boiler and the hob if there is more than 1mbar difference between the meter and the appliances then your supply pipework is undersized , each appliance has its own minimum safe working inlet pressure which is stated by the manufacturers instructions if your system falls below these then it needs addressing ,alot of the time fluctulations in the external supply pipework ie (external factors) as bosch state at certain times of the day mornings evening and weekends times of greatest demand is when these problems show up , post a picture of your gas meter so we can see your regulator and pipework please. i would still say you need a good GSR to gas rate each appliance if these are correct you have and you have a openable window or door direct to outside air in the kitchen and your kitchen is bigger than 5-10 m2 then you have done all you can , the only other option is replacing the hob hope this helps regards kop
If you not happy with what Bosch are telling you, you must get some one in to check the pipework . Read what King Of Pipes has replied , You can either find someone on here, or ring Gas Safe and they will supply you with details of engineers near to you or look on Gas Safe web site.
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