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If it does that on all burners you have a failed ignition control module, the feedback part of the module is not working to stop the clicking. You can try to use some fine sand paper and clean off all the electrode tips and then try it. If it still does that replace the ignition module. Most Thermador units have the control module under the burners so you have to take the top off the unit.
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What is the complete model off the unit? There have been some bulletins regarding grounding and also has this just started to become an issue?
Did they all start doing this at once? Also can you upload a pic of the burners with electrodes in the pic?
I can not accept a phone text site rules you could upload a video here of it or a link to a video.
Ok were the electrodes dirty or corroded at all?
The electrodes are the issue, they have to be super clean no corrosion and the burners have to be seated 100% correctly so the flame is actually contacting the electrode. I often find the burners are dirty, not seated and the flame is not contacting the electrode head. Further a dirty electrode or anything corroded on it will cause that issue. Now note the polarity to the unit has to be correct or you will also have that issue and yes the ground has to be good where it is connected as well. IF you check all those things you will not have that issue.
The one that is working is getting the feedback to the module. Have them use sandpaper and sand the tips all down and make sure the flame is contacting the electrode...physically look at it and see. A dirty orifice can cause a weak flame as well. They should remove the top burner caps and use a paper clip and put it in each orifice and clean them out as well and try it.
They produce microamps to shut the module off typically 3 microamps
Yes the electrode tip generates a microamp feedback signal from the flame correct