Question about Thermador C272 Electric Double Oven

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Troubleshooting thermador my oven keeps on turning off and flashing F34 what does this mean?

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  • quincycuyler Dec 29, 2007

    The oven keeps shutting off and giving me the F34 error code, the thermador oven has been nothing but problems since got it 6 years ago. We haveput in about $1,500 in repairs. Now I cannot even find out what this code means, that sure seems like a simle thing to list.

    I would never recommend buying a thermador oven to anyone.

  • MennoM Jan 11, 2008

    Yep - that's the one. F34 is an airflow switch error, which detects proper airflow from the oven cooling fan (not the convection fan), and is located on the back of the oven. We live in the "sticks" of Connecticut, and the repair guys don't know Thermador very well, so I've taken a DIY approach.

    First time - called repair guy, who came over, did something, and charged us $200.

    Second time - just before Thanksgiving - did some Googling, found something to try: pulling the oven out and cleaning the switch and paddle. This worked until now.

    Third time - knowing that the switch is clean and operating, I'm looking for a loose wire or bad connection to the controller board. I'll post how it goes...

  • siattc Dec 26, 2008

    my oven flashes F64 whenever we turn up the heat or have both ovens on



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Call thermador service center 800 735 4328

Posted on Mar 10, 2008

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One cause of the F34 problem: After taking the back of the oven off, I found that the airflow switch was bad (using a DVM/Ohmmeter). Examining the switch after removing it, I could see that this switch is not sealed, and judging from the slight warping of the case, is being overstressed for temperature. This warping allows airborne grease and dirt to contaminate the internal contacts, making the switch behave erratically and intermittently. The upside to not being sealed is that once you remove it, you can take it apart and clean it, but you have to be careful to reassemble it correctly. This is good, since the website for parts ordering doesn't clarify which of two items listed as "SWITCH" is the one I need, and after 30 minutes on hold calling their parts department, I was disconnected. And to add to Thermador's rep, my email sent to their "Contact Us" link bounced....
Hope this helps....

Posted on Jan 11, 2008


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What does F34 mean as an error message?

Hello, welcome to FixYa.

The "F34" code on your model of Thermador double oven indicates the control has detected an error with the airflow for the upper oven ( all lower codes start with "6", upper start with "3" )

This could indicate a faulty blower motor, not coming on at all, or if it does come on and still initiates an F34 error, it is likely the sail switch is sticking. It can be removed and cleaned as they do become contaminated with dirt, grease and dust over time.

The sail switch is located at the very bottom of the ovens where the grill is, under the lower door.


( F34 can also be initiated by a failed "K6" relay on the control board, but that is less likely )

It can be accessed by way of removing the grill, however it is something usually best left to an authorized B/S/H/ service provider as it can be quiet involved and is better to pull the unit from the wall.

**Turn off the 40 amp breaker to the oven before attempting any first**

B/S/H/ is the parent company for Bosch, Thermador, Gaggenau, Siemens.

Thank you for choosing FixYa today and good luck, please take a moment to rate the info provided here for you.


Macmarkus :)

Sep 15, 2011 | Thermador SC302T Electric Double Oven

3 Answers

F 34

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

Mar 10, 2008 | Thermador C301U Electric Single Oven

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Oven shuts off?

F34 is a cooling motor fault. May sure that the cooling motor is running.If not, then check that there is 120 volts to the motor.The motor sensor on this oven is attached to the cooling fan. It could be a simple issue of loose wire in the connector. Find the wiring going to the relay unit from the motor, pull the connector and hold a flash light on the back side of the connector. You should see almost no light. If you see mostly light, there is your loose connection.

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