Question about Miele 20 in. KM405 Gas Cooktop

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The oven on my gas cooker will light but wont stay lit

It will light ok but once the knob is released it goes out

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Thermo coupling needs changing, unless you are Gas Safe, let someone else repair for you, its a common problem, shouldn't cost much, good luck , the Yeti

Posted on May 20, 2009

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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 ....

Dec 14, 2013 | Bosch PGL985UC 36 in. Gas Cooktop

1 Answer

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


You have what we call a flame safe device fitted to the burner, (thermocouple lead), have you checked to make sure your flame on the burner is touching the tip of the "probe" on t'couple, if it isn't make sure that the ports on the burner are clear. If this does not solve problem then the thermocouple needs replacing by a Gas Safe engineer.

Oct 25, 2013 | Verona VEFSGG365SS 36" Gas Range with 5...

1 Answer

No flame touching thermocouple


There must be a blockage on the inner flame ring as the gas is not getting to the thermocouple .

Apr 21, 2017 | Gaggenau 11 in. VG 232 Gas Cooktop

1 Answer

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.


Need a new fsd ( looks like a small brass pencil) for the burner that won't light. The alignment of the ignition electrodes needs looking at and there over all condition I. E broken , worn , misaligned ect

Jul 13, 2011 | Bosch PGL985UC 36 in. Gas Cooktop

1 Answer

When lighting one of the burners, the ingnition knob has to be held down over ten seconds for the flame to stay lit when the knob is released..


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May 30, 2009 | Gaggenau 11 in. VG 232 Gas Cooktop

1 Answer

When lighting one of the burners, the ingnition knob has to be held down over ten seconds for the flame to stay lit when the knob is released..


Lift the top of the Stove up.
Look for a Small line that goes to the Affected Burner.
At the end of that Line you will see a small Flathead Screw.
Turning That screw Clockwise Adjusts your Pilot Light for that Burner.
Be careful not to Adjust to High, it would just be a Waist of gas.

hope that helped.

May 20, 2009 | Gaggenau 11 in. VG 232 Gas Cooktop

1 Answer

Burnes extinguish once lit.


These have flame failure technology so the gas will cut out if there is no flame. The thermocouples do this by keeping the gas valve open once they have heated up. This should only take 5-10secs though so any longer is probably an issue with the thermocouple

Apr 16, 2008 | Fisher and Paykel GC913 - Stainless Steel...

3 Answers

Burner ignites but doesn't stay lit


The Thermocoupler is faulty or has a bad connection - once the burner is lit, it heats the thermocoupler which then send a small signal to the valve to stay on - at that time you release the knob and the valve stays on ( supplies gas). If you give me a model number, i can get you a part number and price.

Jan 23, 2008 | Miele 23 in. KM360G Gas Cooktop

3 Answers

Baumatic B40 Gas Hob : Gas not staying on.


we have the same problem... try removing the knob, ours works fine without the knobs ????

Dec 19, 2007 | Baumatic 24 in. B40 Gas Cooktop

1 Answer

Burner will not stay lit


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.

Nov 10, 2007 | Miele 20 in. KM405 Gas Cooktop

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