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That unit is suppose to have electronic quartz igniters. Apparently there's a problem but it doesn't automatically mean the igniter needs to be replaced. If you see a spark from the igniter then it's fine. If you see a spark but no flame then the ignition process is out of synchronization. In other words, the gas hasn't concentrated near the spark enough to ignite. This may be a matter of low gas pressure or the extra length the gas needs to flow to reach the center burner is impeding ignition. Simple fix is turn the knob just enough to start the gas for 2 seconds then continue the turn to click the igniter. or simply use a match. You may also see if there are any adjustments on the gas manifold that will enhance bringing more gas to the center burner quicker. Some unit have one click & that's it, others click the igniter continuously until you release turning the knob. Good luck. you'll figure it out.
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.
Hello- These burners can be difficult to disassemble. I would first try an brush the ignitor, electrode, with a wire brush if it is blackened just be careful not to crack the ceramic. Also, make sure that the burner cap is on correctly, it will not spark if the burner cap is not positioned correctly. In order to remove the burner you have to remove the Ventrui tube, this is the bronze nut with the tube attached that is in the center of the burner. You will need a 20MM socket. If you can get the venturi out the burner will pull off. I believe on this one you have to take off both burners in order to remove that section of the cooktop. Be very careful no to force the nut because if it starts to turn but is not actually loosening then you are turning the orifice holder underneath and can crimp or crack the gas supply tube to that burner. The problem with these is that they often do not come out and have to be drilled off and then replaced along with the orifice holder that it screws into under the cooktop. Now, if the problem is occurring on one of the burners that has the extra low simmer (the ones that you can set to come on and off at an interval) then you will probably need a Potentiometer kit which replaces the switches and the spark module. Unfortunately it will probably be best to have a Tech out who is familiar with Thermadors and their particular issues. Sorry
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.