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I have a Smeg 5 burner gas hob. The “wok” burner has a large outer ring and a small central burner which is the problem as it will not stay alight. The spark ignition works fine, and the gas burns fine – as long as you hold the knob in. Once the knob is released the gas goes out immediately. I seems to me that either the thermocouple adjacent to the burner has gone, or the valve is faulty. So any suggestions as to the most likely fault? And of course the usual can it be easily fixed, and is it likely to be costly!
Re: smeg gas hob – burner won’t stay on
Hi
Try it without the actual knob on the shaft,remove the knob and then push the brass shaft in on its own and then light it.if it stays alight then its the knob thats faulty.
Bryan
No the knob is ok – I am a bit further on as I have now removed the top as I originally thought it was probably a loose or faulty connection but there is nothing obvious. However I did notice a review here in UKWhitegoods of the model after mine with the interesting comment “since Smeg modified the thermocouples on these appliances a year or so ago they give little trouble at all. If you have had problems with this call your Smeg agent as there is a cure for any issues with this problem.” So a faulty thermocouple does look likely, and it sounds like they were a known source of trouble at that time.
I suppose the valve shut off device is less likely?er, a thermocouple is a valve shut off device
however we arent allowed to advise on gas repairs
forum rules apply im afraid
Re: smeg gas hob – burner won’t stay on
Hi
No the knob is ok
Did you try what I suggested ?.If not then this all we can advise other than you will need to have a Corgi registered engineer to have a look at it.
You cant tell by just looking at the knob.Bryan
When I said “valve shut-off device” I meant the solenoid at the rear of the valve which is probably remaining shut because it is not getting the go-ahead signal from the thermocouple (or it is jammed which seems unlikely).
Anyway sorry you can’t help further. I’ll put it all back together now!
Just thought you might like to know it is all back together now, and would you believe it everything works perfectly! I guess some grot was the cause, and just cleaning back to bright metal around the thermocouple seat in the casting probably did the trick – or maybe it was just wiggling the wires!
Sorry but I can’t see how the knob can ever be a problem on this model? It is clipped directly on to the valve spindle and unless physically damaged just translates the user push & rotation to the valve body (ok in this instance it also pushes against the paddle that operates the internal ignition button). Maybe the knob issue you refer to is with some other model?
PS On the SMEG website it is noticeable that replacement thermocouples have sprouted an extra earth lead.
the knob issue exists with ALL gas cookers with a thermocouple
its to do with the bypass valve
anyway, you got it sorted thats the main thing
AlanStockport wrote:Sorry but I can’t see how the knob can ever be a problem on this model? It is clipped directly on to the valve spindle and unless physically damaged just translates the user push & rotation to the valve body (ok in this instance it also pushes against the paddle that operates the internal ignition button). Maybe the knob issue you refer to is with some other model?
PS On the SMEG website it is noticeable that replacement thermocouples have sprouted an extra earth lead.
Its fitted directly to the shaft on all cookers that I can think of that operate this sort of system…. but it doesnt stop problems happening even without damage to the control knob.
Its all to do withe the internal parts needing to make a good contact for the burner to stay on, you asked for advice from professionals and was told to try the first thing that we would try but you dismissed what we said, why come on for advice ?
My conclusion would be exactly the same as bryan and helo’s, the knob was pushed too far down the shaft thus stopping sufficient contact between the thermocouple and thermomagnet.
Re: smeg gas hob – burner won’t stay on
hi
But hay ho..we as smeg engineers and corgi engineers dont know what were talking about again..
Bryan
Re: smeg gas hob – burner won’t stay on
I’m Glad you all know nothing 😉
I’ve , or rather my better half has had an issue with her small burner Siemens gas hob for the last few years, basically from New…
after getting some advice on here for a washing machine fault I thought I’ll have a butchers for the gas hob…..
gathered no advice could be given, so checked out some hob posts, and decided if its likely to be the knob I’ll wip it off and have a look …
Couldnt find a fault with it, but figured lets try pushing down that little bit harder…..
Works every time !!!!!
So I played a trick on the missus, making out you had to blow on your fingers first…..
reluctantly after seeing me do it a couple of times, and it has allways taken minutes to light before, she did it herself and it lit….. 😆 😆 😆
thanks guys….
Well happy!!!Re: smeg gas hob – burner won’t stay on
Misinformation in this post from so-called experts!
A thermocouple is not a shut off device. A thermocouple is a thermocouple and a shut-off device is a shut-off device. In this case of a gas hob the thermocouple provides the signal to the shut off device to shut off or not.Re: smeg gas hob – burner won’t stay on
Nice to know that there’s always another expert o hand.
Fact is, thermocouple fails, shut off activates as it should do so, to all intents and purposes for most laypersons, the thermocouple is a shut off or an extension of that device. I doubt they care for the technicalities of it all.
Semantics aside of course.
K.
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