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Orange Gas Hob Flame - Only in Mornings!

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yaserg

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Hi All

I was wondering if one you clever people can please help me out.

IOver the last week I noticed orange flame in the gas hob. The gas hob is Bosch and less than a year old.

I cleaned up everything.

It still continued to be orange.

When I used the hob later in the afternoon and evening it has gone back to being normal blue flames. I tested this everyday and the burners seem to have orange flame only in the morning and blue by the afternoon!!!

What could be the cause of this???

Thanks
 
Switch off the hob at its gas cock and put a clear 'Danger do not use' notice on it. Call the installer (or Bosch) and don't use it again until the fault has been repaired. Only a Gas Safe Registered person can handle this type of fault.

The orange flame is a sign of incomplete combustion and that your hob is producing carbon monoxide. Carbon monoxide is a very dangerous poisonous gas and its effects are ***ulative.

Use a microwave or get takeaways until it's fixed again.

If you have other gas appliances (oven, fires, etc.) check that they are operating correctly and if not don't use any gas appliances until you've been checked.

Further info re carbon monoxide poisoning here:

Carbon monoxide poisoning - NHS Choices

Consult a doctor if you or your family have been suffering from any of the symptoms.
 
Is this happening just on one burner or all of them ? may not be the hob that is at fault but you could be in a area that has low gas pressure at certain times of day.
 
Get it serviced straight away bud and gas rated when your boiler is on to cheers kop
 
king of pipes said:
Get it serviced straight away bud and gas rated when your boiler is on to cheers kop
Click to expand...

Hi.Thanks all for advice.
I have put 2 carbon monoxide alarms next to it and no alarms.

It is all the burners. and just in the mornings for few hours and then goes blue.

The bosch engineer is coming tuesday. Do I need to notify my gas supplier if there is an issue with gas supply in mornings?

Also can anyone reccommend any gas safe engineers in ha8 or ha7 edgware/stanmore area please.

Many Thanks
 
The engineer will contact the emergencey service if needed mate , how many other gas appliances do you have ?
 
Probably we are thinking the same thing JTS but if theres no boiler ? Cheers kop
 
It does sound like your pressure is fluctuating.
What time in the morning is it yellow and what time in the afternoon is it blue again ?
 
Hi all

Sorry I do have a boiler as well. It is a vaillant ecotec 624.

The flames become yellow around 8 and then return to blue around 12ish.

Both by carbon monoxide alarms do not beep and I have put them right next to the hob.

I am completely puzzled by this.

If you think its the pressure does the gas company need to deal with this?

Thanks for all the help so far guys.
 
Do you use a nebuliser in the morning? This can affect combustion.
 
Is your boiler on a programmer so it will be operating ie for heating and or hotwater when the hob is being used? a GSRE needs to do some tests but no the gas company does not need to be contacted by yourself it will be the GSRE responsibility to do this if necessary but i am sure i know what your problem is and it needs addressing contact your local engineer asap . cheers kop
 
king of pipes said:
Is your boiler on a programmer so it will be operating ie for heating and or hotwater when the hob is being used? a GSRE needs to do some tests but no the gas company does not need to be contacted by yourself it will be the GSRE responsibility to do this if necessary but i am sure i know what your problem is and it needs addressing contact your local engineer asap . cheers kop
Click to expand...


Hi. The boiler is on programmer for heating and hot water.

The hot water and heating goes off by 6.30 am so the orange flame is not related to that i think.

In the evening the flames are blue and the boiler is switched on for heating.

What do you think the problem is?

The bosch engineer is coming to have a look at the gas hob but i am unsure if he would be a GSRE.

I am going to contact a GSRE via mybuilder unless there is any recommendations here for north london. I just want this sorted out asap due to baby.

Thanks
 
The Bosch guy will be GS so see what he has to say B4 you go paying out any money, if need be there will be some one on this forum who can help, or ring GS and they will give you some contact numbers for a GS person in your area
 
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.
 
this is what it looks like

Screen Shot 2017-05-02 at 10.16.14.png
 
Did he check the nozzle jets ? Eg were right size
 
Hi. I think he did check all. The hob is less than a year old and we haven't changed anything.

This is what it look now as usual in the evenings. Still waiting for call back from him.

IMG_7248.JPG
 
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.
 
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
 
Update:
Got a call from Bosch engineer who said he has checked with his technical department and conclusions were:
1. It is safe
2. This at times can happen due to 'external factors.'

??- shall i call my gas supplier?
 
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
 
Hi.

Anyone can recommend any good gas safe engineer north london area. I haven't called the gas company. Shall I call them up as well?

Thanks
 
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