My gas cooktop is making a regular cracking sound - like every 10 seconds. I had washed the control tops and put them back on - but that is the only thing...

Display cleaning protection

If you wipe over the control panel while the hob is switched on, settings may be changed. To avoid this, the hob has a function you can use to lock the control panel for cleaning. To activate: Remove the twist knob. An audible signal sounds. The ? indicator and the hob settings flash. The control panel is locked for 10 minutes. You can now wipe over the surface of the control panel without altering the settings.

To deactivate: Put the twist knob back on within 10 minutes. The control panel is unlocked. To end the function early, put the twist knob back on before the 10 minutes have elapsed.

https://www.google.com/search?q=Gaggenau+CI+282+unlock+cooktop

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Here is a disassembly video. A loose knob problem can be tackled by pulling off the knob, encircling the cracked plastic with a zip tie (after putting Loctite glue in the cracks), pulling the zip tight. Don't lose the sleeve when you pull off the knob. But if this is not working for your setup, here is the disassembly, not your model but maybe useful: https://www.google.com/search?q=whirlpool+gas+top+disassembly

Yes the glass is replaceable, you will have to order a new one, and you could do so through an appliance parts store. They can even put it in for you.

Igniters got wet.Look for the crack igniters or replace module control.

take out the control knobs. clean the grease and food partilcles if any using hot water and dish washing liquid .if the washer under the knob is stuck, put it properly and put the control knobs back into it carefully

sounds like a stress fracture is your cooktop supported well

hi.gud day...tnx for question.im gerbee here in the phillipines, the problem of the the unit is have an dirt or water,& oil coz why the unit is not stoping cliking sound.the best thing to is clean the area were the problem it is,first unplug the unit & turn in off the gas line for the safety..get the vacium & bottle of thinner...first remove all the knobs of the control valve(make sure to remember how to remove the knobs coz if turn back as how you remove it). then drops some thinner located on valve switches(knobs position) 5-10ml,,,then put the vaccium in the place were u drop the thinner to suction the thinner,oil & some dirt.try 2 times for good result...after this if is not work n nid to call an expert tecnician to dismantle & clean the micro swicth one by one(no nid to replace the parts)
tnx gerbee

A small crack, turns into a big crack, Short of ordering a new piece of glass, there is no "fix" sorry. YOu can continue to use it, but eventually it will run across the cook top, and then shatter the glass... Better be safe than sorry.

sounds like the electric starter is too far from the burner and isnt sparking any more

The cooktop box has a metal flange. Make sure the cooktop when dropped into the countertop is resting on ther metal flange and not the glass edge by itself. If it rests on the glass alone the weight will cause the glass to crack at some point in time.