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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.
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
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!
You can find parts for your unit by doing a search for “appliance parts”.
Once you get the results of the search, pick a site and when it comes up it will usually ask for the model number of your unit.
Enter your model number and you will then get a page with exploded views and a parts menu.
Find the part you need and then order it.
Check a few different sites to be sure that you are getting the best pricing.
Most sites can have the part to you in a couple of days.
You might have cracked the electrode if you were scrubbing next to it, otherwise you might try taking a little sandpaper and scuffing off any residue on the top of the igniter and seeing if that does the trick. Good Luck!