There are 22mm locknuts holding the burners in place. all are frozen due to heat. any suggestions for how to loosen them? If the have to be cut off, I'm looking at extremely expensive repairs.
First I would try heating it up until it is red and then twist it off. If that is not an option for you then I would get a rotary tool (hobby size) with a cutoff wheel and carefully cut into it from the side about halfway through. That will get it.
SOURCE: Thermador 30" gas cooktop SGCS304RB
Do you hear gas? If so, take a needle and put it through each one of the small holes where the gas comes out.... Also look for a little "white-dust" where the sparker makes the spark. (located probaly at back of burner). If there is a white dust build-up scrape it off with something (needle) and give her another go...
SOURCE: Clogged burner on gas cooktop
lowly is it the left burners that won't lite? I only ask as depending on the model some of the Thermador cook tops had simmer control burners. This is a 3 part system on the burners. 1 a simmer control, 2 electric solenoid, 3 potentiors. When you turn on the burner the potentior tells the simmer control to send power to the gas solenoid. At the same time the unit will spark. If your unit has extra low on the left 2 burners then you have this system. The usual problem in the potentior. Hope this helps.
SOURCE: old Thermador cooktop continues to spark even after turned off
sounds like you have a bad switch. maybe on the large burner.. some of those switches can be replaced without the whole harness.
SOURCE: Cleaning Thermador Cooktop?
To clean the stainless around the star burners try applying Easy-Off oven cleaner around the stars with a Q-tip (spray the cleaner onto the stainless surface first because it's very hard to control the spray output). The cleaner will make your stainless sparkle and the Q-tips allow you to get close enough while controlling the application. Scrub gently with the Q-tip and the stains will disappear within minutes. Wash thoroughly with a wet cloth. I've used this on my older model Thermador stainless cooktop for 5 years.
SOURCE: We have a thermador 5 burner gas range top and the
Most gas range tops no longer have pilot lights but use an electronic ignition (sparker) to light the burner. Normally when you turn the burner on you should here a snapping or sparking sound, at which point the burner should ignite. Here is a link to the user manual for 36" - 5 burner Thermador rangetop...maybe this will help: http://dl.owneriq.net/a/ac64ae7b-1ed3-44a3-9235-e4dbd8fe4628.pdf
By the way, in the short term you could always use a match to light the burner. JUST BE VERY CAREFUL THE YOU HAVE THE MATCH LIT AND OVER THE DESIRED BURNER BEFORE YOU TURN KNOB TO START THE BURNER!!!!
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