Thermador Wall Oven F- in the Legacy SC/SM Family: Main Board Communication Error

What F- means

A flashing F- on an older Thermador SC, SCD, SM or SMW oven means the main power/relay board has detected a communication error. In the service document the control head is named as the cause, along with the power and communication connections between both power/relay boards and the head. It is the board-side twin of FC.

Usual causes of F-

Control head
Power or communication connection between the two power/relay boards and the control head

✓ A safe check worth trying

1. Cut the oven's power with OFF or the breaker. 2. Wait 3 minutes and power it up again. 3. If F- stays on the display, write it down with the model number. 4. Do not disconnect any cable. Call us.

! Why you should stop here

Communication cables carry live signals and fit tightly
The control head is replaced only after the connections test good
The code reads like others, so exact display matters

Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.

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More Oven codes

E15Thermador Legacy Oven, Dreefs Control Code E15: Board Replacement on CT/CMT Models F33Thermador Older C-Series Upper Oven F33, Over Temperature While Cooking F82Legacy Thermador Wall Oven, C/CM Series, Shows F82: Lower Door Reads Locked and Open ErrThermador POD Built-In Oven Err on Legacy POD301, POD302, PODC302, PODM301 and PODMW301: Invalid Temperature F10Thermador C-Series Wall Oven F10 on C/CM/CJ Models: Power Board Incompatibility F34Thermador Legacy C/CM/CJ Oven F34: Upper Oven Cooling Fan Air Switch Not Detected F83Reading F83 on Older Thermador C/CM Wall Ovens (Lower Door Stuck Position) E + numberThermador POD301 and POD302 Oven E + number: Display Code With Beeping

F-F- questions

How does F- differ from FC?

FC is a communication error seen by the display head. F- is one seen by the main power/relay board. Both involve the same link, viewed from different ends.

Is the dash part of the code?

Yes. The Care & Use manual lists F- on its own alongside Fr, FC and FF. When you call, say exactly what the display shows.

Is a reset worth trying?

Yes, once. It can clear a one-time communication glitch. If F- returns, the link needs testing by a technician. For an older oven we begin with the model number on the frame.