Our 6-burner Thermador cook top has two simmer burners. Both of them stopped working last week. Even though the igniters spark, not gas is coming out of these two burners. What went bad?

Hello Sharon,
are the two left hand burners "simmer burners" that low come on and go off to simmer a pot?
and the right side just set on and turn off without the simmer option?

if yes this pretty much describes your cooktop the part called the potentiometer is going the be the problem.

Center burner won't light: If there is a bright spark (check all ignitor points at night with the lights out and look for consistent brightness of the sparks) then it's likely that the burner slots are dirty or the air/gas mix is wrong. If you can light with a match, but the spark won't light, then go for cleaning the entire burner assembly thoroughly with a brass bristle brush (available at most automotive stores). The proper air/gas mix has to flow over the spark to ignite. Weak spark, improper air/gas or misdirected gas flow that misses the spark can all cause this issue.

RR burner lights only on low setting. Again, check the air gas mix and clean all parts. Something like a small spider web inside the air mix chamber (area between the orifice and the burner can cause this and is difficult to see. Disassemble, clean thoroughly, reassemble and test. Extra low simmer burners (two on the left side) use their own control module with electric gas valves and variable electric control switches. The burner works on low, so these are not likely the problem.

Most folks want to find a bad part, and that can happen, but stove tops get dirty and cleaning usually helps. If not, you have a clean top to work on.

The indicator lens and/or the retainer are either broken or the retainer is missing. It's best to replace these as they are not expensive. When the top is off while cleaning is an perfect time to replace the lens.

You could have a clog in your gas line. Have the gas company come out to check the pressure.

Clean the grease off the igniter; if that don't do it replace the spark module. Manual

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

I don't have a Thermador cooktop but here is ma taught.

Could you unplug the two faulty igniters and see if problem remained

Could you plug one of the faulty igniter at the location of a good one. The goal is to isolate the problem. Is it the igniter or the electronic board.

Faulty ground problem may occur also after an spillover on the stove. In that case, use a cotton swab dipped in scrubbing alcool and clean the spark area on the igniter and the burner.

Good luck

sounds like you have a bad switch. maybe on the large burner.. some of those switches can be replaced without the whole harness.

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.

Lowly what the potentior does is turn on the burner control system. When you turn on a normal burner you are opening a gas valve and closing a switch to generate a spark. Thus gas flow to the burner and spark. On the extra low simmer burner there is a electric solenoid between the burner head and the gas valve. this has to open as well for gas to flow. What the potentior does is signal the simmer control what level of flame you are requesting and telling the spark module to generate a spark. Once you go to the exlow setting the potentior tells the simmer control what level of heat and will cycle the flame on and off. So when the burner knob was between low and extra low, the flame would cycle on and off. You have to seperate the top section of the cooktop from the burner box to change the potentior for it sits on top of the gas valve for that burner.

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.

Either the potentiors or the simmer control.