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If you can hear the clicking sound but are not getting a spark then there is probably a short in the ignition system. Check for any loose wires on the ignition system. Make sure all the wires are properly seated. Make sure the spark module is properly grounded. As far as testing the spark module it should be generating a spark of course. The problem is that the average voltage for the spark module is 15,000 VDC so actual testing of that voltage can be difficult. Is the spark erratic?(should spark evenly). An erratic spark timing is a sign of a bad spark module. Is the spark slow? Check the polarity of the electrical plug. If it is clicking evenly then it is probably arcing somewhere inside the cooktop and you just need to find out where. Also be aware that if you get water into the cooktop that can cause possible grounding of the spark module or ignition system.
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.
Most likely its dirty meaning the burners themselves and aren't getting any gas through. If you feel lucky you can do this without turning off or unplugging the stove, but on the oft chance there is a short I would do those just to be on the safe side. If you know how lift the top part of the stove up, you did not give model number. Find the electrode and clean with a clean toothbrush, plug in see if there is a sparks, actually look for the spark first. If you have a spark then your issue is the feed to your burners or the burners themselves being clogged. The feed is like a straw should there be an obstruction than nothing passes through. Clean the burners with a pin, blow through the gas inlets that go to the burners. After cleaning retry.
I have a Thermador Gas Range PG364GDBS - Oven, 4 burners, and center griddle. All are gas. The four burners and gas oven
work fine. The griddle just stopped working, no spark. Turning on the
griddle control, the gas valve opens(hear it), gas flows (smell it),
but the ignitor will not spark (no loud or faint spark that I can
hear). I got a replacement ignition device (mount at the burner)
thinking it might be the problem, but still no spark. I checked the AC
voltage at the terminal and measured 39 VAC between the terminal and
ground. Not sure if that is the correct voltage. Any insights or advice
would be great.