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F34 Upper oven cooling fan over-speed or under-speed detected,
the problem is with the cooling fan, if the fan is running correctly the oven will shut off, the fan cools the controls and if it fails or isn't and running properly the control board senses that and shuts the oven down, you need to replace the cooling fan, this can sometimes be a big job on these Thermador ovens, it's best to call a technician to replace it but that's up to you, you will need to contact Thermador to order a fan, thanks and best wishes, Bryan