Thermador Older C-Series Upper Oven F33, Over Temperature While Cooking

What F33 means

F33 on a Thermador C271 through CJ302 oven means the upper oven passed its temperature limit while cooking. The legacy table gives one owner-checkable cause: power turned on while the interior was still above 550 F. Otherwise it points at an intermittent sensor or the power/relay board. Newer Thermador units can print F33 for other reasons, so the model number decides how we read it.

Usual causes of F33

Power switched on while the oven interior was above 550 F
Intermittent upper oven sensor
Header P3 connection or the power/relay board

✓ A safe check worth trying

1. Switch the oven off and let the interior cool well below 550 F before restoring power, as the source says. 2. Keep the door closed while it cools. 3. Turn power back on and try a short bake. 4. If F33 returns on a cool oven, stop and call us.

! Why you should stop here

If F33 appears on a cold oven, a hot-start cannot be the reason
Overheating is a safety matter, so repeated testing is not a good idea
We give written pricing first, with parts confirmed by model number

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

E13Thermador Oven E13, CT vs CMT Dreefs Control: Frozen Latch or Board Not Converted F31Thermador Legacy CM/CJ Upper Oven F31 Sensor Circuit Open F81Lower Door Stuck Unlocked: Thermador Wall Oven F81, C/CM-Series Legacy E011Thermador Masterpiece Steam and Convection Oven E011 on Legacy MES301HS and MES301HP: Touchpad Stuck E14Thermador Wall Oven E14 on CT/CMT Ovens with Dreefs Control: Loose Latch Switch F32Self-Clean Overheat: Thermador C/CM/CJ Wall Oven F32 in the Upper Oven F82Legacy Thermador Wall Oven, C/CM Series, Shows F82: Lower Door Reads Locked and Open E...Thermador Steam and Convection Oven E... Messages on Legacy MES301HS and MES301HP

F33F33 questions

Can a power outage during a hot bake cause F33?

Yes. The source says the code can follow power being turned on while the interior is above 550 F. If that is what happened, a cooled oven should start normally.

What if F33 returns on a cool oven?

Then the hot-start reason is ruled out, and the sensor or power/relay board becomes the focus. Stop using the upper oven and book an inspection.

Is F33 related to F32?

They are close cousins. F32 covers over temperature while cleaning, F33 while cooking. Both point to the same sensor and board, so we test those parts either way.