Fan works, but Oven stays at 100 degrees. Tried

Check if the internal ventilation fan is running. It is intended to cool down the oven exterior. Some units made 2004-2007 can overheat during self-cleaning.

fan/air flow issue. call a qualified technician.

fan/air flow issue.

could be a relay board problem. may be a bad solder connection on it. Inspect all with a good magnifier. resolder as needed.

Bad oven thermostat , if you get me the Brand,model and serial number i will locate the part for you

Try unpluging the oven for 10 min's then plug it back in to reset get back to me , if you still arent working but i will need the brand , model, serial number

Sounds like you have a real POS on your hands. I would chuck it and get another unit rather than waste any more time and money on this Thermador.

hi thanks for the question look at the cord that plugs into the wall you could have a bad connection in that outlet remove the plug from the wall and look at the prongs if its a bad connection they will be discolored check that the appliance doc

My Name is Don from Mr Fix it Applaince in baytown texas. I have seen this F34 error as well and may have a solution for some of you... According to a Thermador error code book for a C301bs/03 single Thermador oven. It says its a air flow problem. This means it could be the fan motor sensor telling the controlboard that it is not spinning fast or not at all. or it could be a micro paddle switch that is activated by air flow, I found Two of them on the bottome of a double oven thermador a few moths ago.. Recap : if your fan blower motor has 4 wires going to it, it has a sensor reading the rotation of the motor.... if yours does not have this then you should look for a paddle switch.

I’m happy to assist further over the phone at https://www.6ya.com/expert/donald_a8261495ff0777e2

call Thermador service center 800 735 4328
they said that if you have had an electrical outage or surge recently-
turn off dedicated circuit at circuit breaker for 1 HOUR