Question about Miele 20 in. KM405 Gas Cooktop

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Burner will not stay lit

Cleaned it. Burner ignites OK but will not stay lit when knob is released.

Posted by alandabby on

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  • GEFU Nov 13, 2007

    I have a SMEG SAR134 gas cooktop. I can ignite the wok, but once I release the knob, the flame will go off. I have cleaned the thermocouple thoroughly, but still the wok will not stay lit. I've also tried to press the knob a few times like pumping it, it works sometimes, but most of the time it won't work.

  • Ivie Jan 28, 2008

    I have an indesit dual fuel range cooker. Bought secondhand-supposedly never used. Initially had difficulty with the burners staying alight. Two did but not the others. Changed out some of the burners as they didn't seem to fit correctly but this didn't solve the problem. Now the two that were working don't. Have changed one of the themocouples but that also hasn't solve the problem. All the buners will ignite but when you release the knobs they go out even if you hold the knobs down longer than the recommended time. The oven (electric) works perfectly. Any suggestions?

  • abbysmom Aug 31, 2008

    I have a 2 burner Princess Gourmet cook top in a '07 RV. From almost day one the bigger burned will always stay lit, but the smaller burner sometime does and mostly does not. It will light when depressed, but will not stay lit. HELP - if someone knows how to fix please tell me.

  • Anonymous May 09, 2009

    Top burner will stay lit after knob released.  Bottom burner will light but goes out after knob released. Gas supply is good, electrical connections good. Does any one know which component is bad?

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Presuming the flame is touching the thermocouple, try putting slightly more pressure on the knob and hold for a few seconds longer. If this doesn't work try going through the same process with the knob removed - if this works you need to put a small piece of packing in the shaft of the knob ( a small piece paper might do). If this fails you need a new thermocouple.

Posted on Nov 18, 2007

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  • Demy Vasquez
    Demy Vasquez May 09, 2014

    all burners seemed intermittently not staying i replaced both right thermocouple but still same. all burners seemed to be doing it intermittently

  • Demy Vasquez
    Demy Vasquez May 09, 2014

    thats AEG cooktop.

  • Brian Jenkins
    Brian Jenkins Nov 30, 2014

    Brilliant. Thank you. Just added a few wads of packing and hey presto

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1 Answer

A gas ring does not remain lit after lighting on one of the burners on my Borsch brushed steel gas hob


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

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1 Answer

I have bosch pgl985uc burner problem. The center burner will not stay lit. Seems other have had this problem. I ordered all new thermo-couplers. Installed, since Bosch changed them to a new part number...


If The Burner lights and stays lit as long as the knob is depressed, but goes out after the knob is released then there is a failure with the thermocoupler or the valve itself. The thermocoupler can be tested once removed from the cooktop - as follows
Heat the tip on the thermocoupler with a match or lighter and measure the electrical connection (other end) with a voltmeter - it should read about 15 mV or slightly more with in a few seconds. If no voltage is read then the thermocoupler is faulty and should be replaced.
The valve coil can also be tested for continuity at while the unit is disassembled. If no continuity is found the valve is faulty and should be replaced
The small voltage created from heating the thermocoupler energizes the coil in the valve which in turn keeps the gas turned on while there is heat at the thermocoupler.
Some units actually reignite the burner if the heat is lost and the control knob is in the on position.

Hope this helps ....

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1 Answer

Gas burner will not stay lit. works fine when pressing knob for igniter function but goes out when knob is released


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The burners light, but it takes an inordinate time for them to stay lit. One of the burners will not stay lit when the knob is released, regardless of how long you depress the knob.


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1 Answer

I have bosch pgl985uc burner problem. The center burner will not stay lit.


I have the same problem especially with the center burner, but now am having increasing difficulty with two other burners. Those will eventually stay lit if I depress the knob for 20 - 30 seconds. The center burner will not stay lit, even when keeping the knob depressed for 2 - 3 minutes!

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When you turn on any burner on the spark igniter will stay on after the burner is lit and the knob is turn from the lite position.


You could of possible got the stove top wet causing the problem.This problem although sounds like your spark ignitor module went bad.

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1 Answer

Igniter doesn't spark on only one burner


There are three parts to the ignition system typically.

The ignitor that is either in the burner or outside the burner.

The spark ignitor switch that is located on the burner control. (( one for each control ))

The spark modual. the modual creates the hi-voltage spark.

If the burner that does not ignight with its control does not spark but does spark with one of the other controls then the spark ignitor control switch is bad.
You can test it with one of the other burner control knobs. (( just try a working burnder and when it clicks look at the bad burners ignitor and look for the spark.))

If the bad burner that wont ignight does not spark then either your modual is bas or the ignitor is shorting out.

If you see any little spark but it does not spark from point A to Point B like the other burners then your ignitor is shorting and should be replaced.

If your ignitor is ceramic and it is cracked, then it should be replaced.

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