I'm yet another person who is having issues with my Thermador XLO burners. When I started I had 1 burner that didn't work, and 1 that worked but occasionally made a loud buzzing sound when lit. I installed the new potentiometers and simmer control kit, which was reasonably easy, but now neither of the burners works. I did turn off the power when I was working on it, so there should be no issue with damage from a short as I read in another thread.

I don't get any gas flow or spark at either burner when I turn the knob, but I do get spark at both burners when I turn one of the other working burners on.

Here are my questions:

How can I test the solenoids to see if they are functional?

If the burners spark when I turn other burners on, does that mean the spark module is OK?

What else could be the culprit?

I really appreciate any help anyone will give me. I'm a pretty mechanically and electronically inclined person, but have little experience with appliances.

Thanks

The part numbers are:
Kit: 497234
Pot: 422748
Simmer Control: 422882

These show as the proper parts for this model in the included "Service Bulletin". I did the 1 wire at a time method when I swapped the simmer controller, and triple checked all of the connections.

The pot seems like a pretty simple part, and unlikely that both would be bad. So if anything is bad it would likely be the simmer controller. Are there any other parts I should check?

Thanks.