Gas knob not turning off gas

[DavidPB]

Has anyone had a problem turning off a burner?

One of my two gas burners won’t turn off so I have to turn off gas under sink. Knob turns gas on and I can light it but when I turn it down the flame doesn’t go out. The other job works fine.

Any ideas?

 

[yossarian]

It's gas in a box: the consequences of getting it wrong can be quite bad.

I'd suggest you check that the automatic safety shutoff is working and use common sense to determine how to proceed from there.

 

[flying banana]

thermocouple ?

 

[WelshGas]

Has anyone had a problem turning off a burner?

One of my two gas burners won’t turn off so I have to turn off gas under sink. Knob turns gas on and I can light it but when I turn it down the flame doesn’t go out. The other job works fine.

Any ideas?

I'm not sure what you mean. My gas tap goes from Off - then turn anti-clockwise to Ignition/Full - continue anti-clockwise to minimum. In order to turn Off you turn clockwise from Minimum to Full to Off.
The flame failure sensor often cuts off gas on Minimum if no pan on the burner as insufficient heat to keep flame failure sensor working so gas cuts off.

 

[DavidPB]

It's gas in a box: the consequences of getting it wrong can be quite bad.

I'd suggest you check that the automatic safety shutoff is working and use common sense to determine how to proceed from there.

Gas in what box?
I can turn the gas off under the sink and at bottle

 

[DavidPB]

I'm not sure what you mean. My gas tap goes from Off - then turn anti-clockwise to Ignition/Full - continue anti-clockwise to minimum. In order to turn Off you turn clockwise from Minimum to Full to Off.
The flame failure sensor often cuts off gas on Minimum if no pan on the burner as insufficient heat to keep flame failure sensor working so gas cuts off.

My gas tap is the same. Didn’t know there was a flame failure sensor. Should this cut the gas off to the burner if not in use? Can’t understand why other burner works when two burner hob

 

[DavidPB]

I

My gas tap is the same. Didn’t know there was a flame failure sensor. Should this cut the gas off to the burner if not in use? Can’t understand why other burner works when two burner hob

assume then that gas should cut off automatically after a while if burner not in use?

 

[DavidPB]

It's gas in a box: the consequences of getting it wrong can be quite bad.

I'd suggest you check that the automatic safety shutoff is working and use common sense to determine how to proceed from there.

I didn’t know there was an automatic cut out. I don’t understand ref ‘gas in a box.’ If second burner on same job working okay.
By common sense I assume get gas system checked by a qualified gas engineer.

 

[DavidPB]

I didn’t know there was an automatic cut out. I don’t understand ref ‘gas in a box.’ If second burner on same job working okay.
By common sense I assume get gas system checked by a qualified gas engineer.

Not job HOB it’s a 2 burner HOB

 

[WelshGas]

My gas tap is the same. Didn’t know there was a flame failure sensor. Should this cut the gas off to the burner if not in use? Can’t understand why other burner works when two burner hob

It will cut the gas off if the flame goes out eg: blown out by gust of wind.

 

[P600BOO]

I didn’t know there was an automatic cut out. I don’t understand ref ‘gas in a box.’ If second burner on same job working okay.
By common sense I assume get gas system checked by a qualified gas engineer.

Gas in a box. He means if the flame goes out and gas continues to escape then your Van
( Box) can become a bomb

 

[DavidPB]

It will cut the gas off if the flame goes out eg: blown out by gust of wind.

So won’t necessarily switch off gas if flame not going out when knob turned off as other burner does on twin hob?

I thought the 2 burners connected on twin hob so if one can be turned off, the other should too.

Gas in a box. He means if the flame goes out and gas continues to escape then your Van
( Box) can become a bomb

Thank you Welsh Gas. Had an idea that he meant the cali but couldn’t see how if automatic cut out worked.

I wondered if it down to infrequent use eg holidays a couple of times a year and last one last September. Cali 5 years old (T6)
My first thought is that the problem lies with that knob not turning off properly if other one still working but can’t really see any difference between them other than one turns ‘on’ by going clockwise and the other ‘on’ by going anti-clockwise. Knob not loose or anything. Think I need to take van in for a Caravan and Motorhome Service to be on safe side though.

 

[DavidPB]

Gas in a box. He means if the flame goes out and gas continues to escape then your Van
( Box) can become a bomb

Sorry P600BOO meant to reply to you

 

[yossarian]

thermocouple ?

Yeah, they are commonly called a "flame safety device" flame supervision device or flame failure device.

It's typically a thermocouple driving an electricly actuated shut-off valve. You (DavidPV not flying banana) could Google how to test it. If it's not working you have quite a dangerous setup. If it is working then you should plan to have things repaired at your convenience.

 

[DavidPB]

Yeah, they are commonly called a "flame safety device" flame supervision device or flame failure device.

It's typically a thermocouple driving an electricly actuated shut-off valve. You (DavidPV not flying banana) could Google how to test it. If it's not working you have quite a dangerous setup. If it is working then you should plan to have things repaired at your convenience.

So this shut off valve should cut off gas to that burner once I’ve turned burner knob to off position even though flame still lit?

 

[andyinluton]

So this shut off valve should cut off gas to that burner once I’ve turned burner knob to off position even though flame still lit?

Your problem has absolutely nothing to do with the thermocouple. That is designed to cut of the gas if the flame goes out.
If I understand correctly despite turning the knob to the off position, your gas remains lit? If thats the case the knob, or rather the valve under it is faulty allowing gas to pass through when it shouldn't.

 

[BikerGran]

It sounds to me as if you're expecting the gas to turn off when you turn it right down to its lowest flame, but it doesn't work that way. You have to turn it to the highest flame then a bit further that way to turn it off.

 

[DavidPB]

Your problem has absolutely nothing to do with the thermocouple. That is designed to cut of the gas if the flame goes out.
If I understand correctly despite turning the knob to the off position, your gas remains lit? If thats the case the knob, or rather the valve under it is faulty allowing gas to pass through when it shouldn't.

Hi Andyinluton,
You have summed up my problem in a nutshell thank you.
I had assumed that it something to do with the knob not shutting off the gas or what immediately under because no problem otherwise.
I am staying on a Caravan & Motorhome club site at moment so will ask wardens if the club have their own specialists or a recommended gas service company.

 

[Kingfisher]

My first thought is that the problem lies with that knob not turning off properly if other one still working but can’t really see any difference between them other than one turns ‘on’ by going clockwise and the other ‘on’ by going anti-clockwise.

For what it’s worth, on my T6 and previous T5 both knobs turn the same direction: anti-clockwise to turn from off to high and then further anti-clockwise to low. Same as WelshGas described in post #4 above. In the off position, the knob pops up to a very slightly higher position, meaning that you have to press down in order to turn on again.

Edit: try turning the knob the other direction.

 

[andyinluton]

For what it’s worth: on my T6 and previous T5 both knobs turn the same direction: anti-clockwise to turn from off to high and then further anti-clockwise to low. Same as WelshGas described in post #4 above. In the off position, the knob pops up to a very slightly higher position, meaning that you have to press down in order to turn on again.

I was wondering about that, if the knob sticks down does it keep the gas flowing? @DavidPB can you try pulling the knob up gently after turning it off, does that make a difference?

 

[DavidPB]

For what it’s worth, on my T6 and previous T5 both knobs turn the same direction: anti-clockwise to turn from off to high and then further anti-clockwise to low. Same as WelshGas described in post #4 above. In the off position, the knob pops up to a very slightly higher position, meaning that you have to press down in order to turn on again.

Edit: try turning the knob the other direction.

Hi Kingfisher. On further inspection I can see that both knobs are identical and turn anticlockwise as you say.

 

[DavidPB]

I was wondering about that, if the knob sticks down does it keep the gas flowing? @DavidPB can you try pulling the knob up gently after turning it off, does that make a difference?

I will try that and Biker Gran's suggestion now that back from holiday. I have a Cali Ocean T6 2019

 

[BigPritch]

We had this problem when we picked up our 07 T5 SE (3r owners).
Turned out it was due to gas simply not being used for a sustained period of time, together with a faulty regulator.
Gas bottle changed, regulator replaced, both burners lit for some time to get some 'use in the pipes', and problem solved. Touch wood no issues since
Might be worth getting regulator checked, even if its not that...
Good luck.