Have the same problem with two hobs and one of them is baumatic and i solved the problem, it isnt a manufacture problem but indeed its dirt problem, next the ignition there is a heat sensor that works on magnetic source you should clean the very top of it with a knife by passing it you should remove the black dirt and then brush it with a t
Symptom is as above. I have a Siemens two burner top by Schott Ceran. Both are intermittent, and fails most of the time. They will usually keep lit if I try about ten times, and if I turn it off again once it has stared working, it will light normally if I try again. If I let it cool for a minute it will start troubling again. The thermocouple next to the igniter is clean (cleaned it with a knife), so I guess they are OK, although they can get faulty, but saw another post of someone replacing the thermocouple with no effect.
Then I tried the advice above on pulling off the knobs. And now it works... And I put the knobs back on, and it fails again! And it is reproducable every time!?! Very strange, yet delightful insight. Dismantling the thing tomorrow.
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Seems like one of the thermocouples has failed or it may just be dirty. There should be 2 "prongs" sticking up toward the burner. 1 is for the ignition and causes the spark to jump to the burner and light it. The other is a thermocouple which senses the heat from the flame and operates a magnetic device on the gascock to keep the gas flowing. If the thermocouple is faulty, damaged, dirty, it may not sense the heat and therefore, the flame will keep going out. Make sure the end of it is clean and the burner is positioned properly on its base. The thermocouple is usually a steel rod sticking up. This can be easily cleaned with a bit of steel wool or scourer. Do NOT scrape or scour the ignition prong as this is made from porcelain and can break very easily. It is usually white in colour, with a little metal cap or stud on the end. sometimes , the knob wears and you cant push it down far enough to lock the magnet when the flame is on. Pull the knob off and try stuffing a little bit of paper down the hole in the knob which goes onto the gascock shaft.. This will allow you to push the shaft down further and thus ensure the magnet is locking onto the gascock. If you are unsure, try a knob from one of the other burners that you are not having trouble with and see if that works, if it does, then you know its the knob, Cheers, Steve
Looks like you may have a bad ignitor. Try adjusting the arc gap. Sometimes of the ignitor is too close to the burner, the ignitor will not spark. It may also be that te burner is dirty and needs a little cleaning to allow for the electric ignitor spark to arc accross, thus producing ignition. Good luck.
Will most probably be a problem with your ignition box. If you want to test this try taking off the hob by undoing the screws under the burners, be very careful with these however as it is very easy to strip the thread on them, once you have the hob off try unplugging the ignitor that keeps sparking and swapping where its plugged into the ignition box with another ignitor. These ignitor can be plugged into any plug in the box so no worries there. If the ignitor keeps sparkings in another hole its the ignitor. If the new ignitor sparks its the ignition box. It will most probably be the ignition box. Is a common fault