thermador prsg304s burner problem

Old 01-31-13, 08:59 AM
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thermador prsg304s burner problem

I have a 1996 Thermador prsg304s range. All burners light and work properly when the unit is first turned on cold. When oven has been on for approximately 20 minutes, the left front burner (a simmer burner) no longer will work. The igniter sparks but there is no longer any gas flow to that burner. All other burners still operate properly. That burnerner will not relight until the oven has been turned off for at least a couple of hours. Any ideas would be appreciated.
Old 01-31-13, 07:03 PM
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I'm assuming natural gas ?

All the burners use a common gas that would not be an issue.
It would suggest a problem with the gas valve for that burner.
gas valve
Bosch 415499 Valve Body (simmer) -

Apparently there is a potentiometer that is attached to the gas valve and may also cause your problem. Read the following link page all the way thru.
Bosch 422748 Potentiometer -
Old 03-18-13, 03:33 PM
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Did you try putting a pan of water on it, if memory serves me the burner is designed to cycle on/off

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