Thermador Wall Oven F70 in the Legacy C/CM Family: Lower Meat Probe Shorted

What F70 means

F70 shows on older Thermador C, CM and CJ302 ovens when the lower oven meat probe circuit reads as shorted. This is a low-severity code: it points to the probe wiring rather than the heating system. If you use the probe, check it first. If you never plug it in, the short may be inside the oven wiring or on the control display board.

Usual causes of F70

Short in the meat probe wiring
Control display board, if the code persists after the wiring is checked

✓ A safe check worth trying

1. Stop the oven and let the cavity cool. 2. If a probe is plugged in, unplug it and look at the cable for damage. 3. Reset with OFF or the breaker for 3 minutes. 4. If F70 returns with no probe attached, note it and call us.

! Why you should stop here

The probe jack wiring runs behind the cavity wall
Board replacement should follow a wiring test
A damaged probe cable can be mistaken for a board problem

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 F83Reading F83 on Older Thermador C/CM Wall Ovens (Lower Door Stuck Position) 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 F84Thermador Wall Oven F84 on Legacy C/CM-Series Ovens: Lower Latch Input Shorted E + numberThermador POD301 and POD302 Oven E + number: Display Code With Beeping

F70F70 questions

Do I need the probe to cook?

No. You can bake without it. If F70 blocks normal cooking, a technician should look at the probe circuit so the oven works again. Work on your oven comes with a 30-day workmanship warranty.

Could my probe be bad?

Yes, a crushed or kinked probe cable can cause a short. Trying a reset with the probe unplugged is a safe first step. Keep the data plate details nearby when you phone.

Why would the display board be involved?

The probe jack connects to the display board header. If wiring checks fine and F70 stays, the source says that board is the next item to replace.