Question about Thermador SC302T Electric Double Oven

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Thermador double oven SC302 Fault code F34

I replaced the board last year. This holiday season, the fault code came back. Is this oven not to be used for cooking?

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Re: Thermador double oven SC302 Fault code F34

First check to see if the oven is under warranty it might also be a manufacturers defect

Posted on Dec 30, 2007

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CM302US Thermador Double Oven F34/64 Problems need schematic diagrams

air flow/fan issue. either bad fan motor, air flow switch or relay board.

Nov 29, 2012 | Thermador C302U Electric Double Oven

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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

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Thermador SC302 double oven the top oven is not getting hot

We've had the same problem. I contacted a local sales room and they contacted their rep who promptly mailed the replacement parts I requested (I'd looked up the part numbers already). Now I'm waiting to find someone who will reasonably do the work.

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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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Thermador Display

Have 2 Thermador ovens, SMW272 and SC302. Both have display failure. Just repaired one with replacement display. It did not require a new control unit or harness. Have not opened up second unit yet as display is still dimly/slightly visible.

Called Thermador and received no offer of replacement parts or service. Numerous other web reports of similar failures. My neighbor has 2 dead ovens also unfixed because of outrageous repair estimates ($600 each). Do not recommend this brand.

Full kit including display, control, and harness ordered on Ebay for $170.

Sep 21, 2007 | Thermador SMW272 Electric Double Oven

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