Question about Thermador C301U Electric Single Oven

3 Answers

F 34 my oven shuts off & shows f34

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  • pblumen Jul 27, 2008

    Thermador SMW272: When turning on the oven, it starts to heat, but then stops, with "F34" flashing in the control panel. I threw the breaker for 5 minutes or so as recommended in the manual, but this didn't fix the problem. We have had some problems with lights in the house flickering and I am wondering if there is a loose neutral wire someplace.

  • Anonymous Aug 24, 2008

    My oven shows f34 error code and immediately shuts off...just like the person below. it is frustrating, we have not been able to find an error code list to tell us what is exactly wrong.



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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

Posted on Jun 05, 2009

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After reading that F34 means that a fan may be too dirty to operate correctly, I cleaned the oven (automatic still worked) before calling in an expensive repair person. Oven works properly now! Perhaps others might try the same solution; if it doesn't work what are you out?

Posted on Feb 12, 2010

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Called thermador service center, 800 735 4328,
they said: if I had had a electrical surge or outage recently (yes)- so then turn off the dedicated circuit @ circuit breaker box for about 1 Hour---the oven is trying to re-install its' pre-programed info & is "searching"

Posted on Mar 10, 2008

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My thermador double oven turns off once I heat both ovens for use, it will beep, turn off and display F34 in the display window. The appliance service man has been out to look and called the company and...

the problem is the fan is either bad or there's a screen near the fan,it could be blocked with dust but f34 is a problem with the cooling fan,the fan cools off the electronics and your machine is overheating and shutting down,check the fan

Oct 17, 2011 | Thermador CM302U Electric Double Oven

1 Answer

Shows #34 on display and does not function


Welcome to FixYa.

The "F34" code on your model of Thermador oven indicates the control has detected an error with the airflow for the oven.

This could indicate a faulty blower motor not coming on at all, or if it does come on ( you should be able to hear it or feel it blowing out the bottom under the door if it's working ) and still initiates an F34 error it is likely the sail switch is sticking. The switch 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. The blower is located at the back wall of the oven plenum as illustrated here.
( F34 can also be initiated by a failed "K4 relay" on the control board, but that is less likely )

The sail switch as I mentioned can be accessed by way of removing the lower grill...i.e. macmarkus_223.jpg **Turn off the 40 amp breaker to the oven before attempting any first**
If you feel capable this is the procedure for testing the blower and sail switch as follows...At this point I recommend calling in a pro, it's your call.


Let me know if I can assist you further regarding this issue and I`ll try to be available asap.

Good luck.

Thank you for choosing FixYa today, please take a moment to rate the info provided here for you.
Macmarkus :)

Jan 08, 2011 | Thermador CM301U Electric Single Oven

3 Answers

Oven stopped heating - F34 displayed.

You get F34 error because there is excess heat within the oven.
You need to clean the cooling fan for any debris or dust, if this does not solve the problem replace the cooling fan.

Hope this helps.

Thanks for using Fixya.

Dec 15, 2009 | Thermador C301U Electric Single Oven

2 Answers

Oven turns off

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

Feb 27, 2008 | Thermador C301U Electric Single Oven

1 Answer

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.

Jan 06, 2008 | Thermador SEC301BPSS Electric Single Oven

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