Thermador oven error codes like F24 or PROBE usually indicate a faulty temperature sensor. The primary fix is testing the RTD probe for 1,080 to 1,095 ohms and replacing it if the resistance is out of range.
Most of the time when I see an F24 or PROBE on a Thermador, it's the RTD probe and you're looking at a $30 part and about 20 minutes of your Saturday. But if you ignore it and keep forcing the oven on, you risk the control board overcompensating and frying itself, which turns a cheap fix into a $400 repair. The F34, F7, and F64 codes are a completely different situation and usually mean the board is already gone.
ThermadorOven
About These Thermador Oven Error Codes
OK so here's the deal with Thermador F-codes. These are premium ovens, usually $3,000-8,000 installed, but even high-end appliances get sensor failures. The good news is F24 and PROBE are usually a $25-45 fix. The thing most techs know that homeowners don't is that these ovens are really sensitive to voltage spikes, which is why you see F34 and F7 pop up a lot more often in areas with unstable power.
Most Common Error Codes
RTD temperature probe failed or disconnected (F24, PROBE)40%
Control board relay failure from power surge (F34)24%
Door switch failure (F7)22%
Control board internal fault (F7, F64)14%
Symptoms You May Notice
Display shows F24, F34, F7, F64, or PROBE and the oven refuses to start a cook cycle at all
Oven was working fine then cut out mid-bake with an error code on screen and now it won't come back on no matter what you try
Relentless beeping that won't stop until you cut power at the breaker
Oven preheats but takes forever and never quite hits temp, then finally throws a code after 20-30 minutes of struggling
Door feels mechanically locked even though the oven is completely cool, usually alongside F7 on the display
ConditionIf Open (OL) or infinite, replace component.
Frequently Asked Questions
What F-codes does a Thermador oven use?
Thermador ovens use F24 for a temperature sensor fault, F34 for a control board relay failure, F7 for either a control board fault or a door switch problem, and F64 for a control board internal failure. Newer models with full LCD displays may show PROBE instead of F24 when the temperature sensor fails. If you're seeing a code that's not on that list, it's possible a digit got corrupted in the display, so cut power and let it restart to confirm what you're actually dealing with before you go ordering parts.
Which Thermador oven error is easiest and cheapest to fix?
F24 and PROBE, no contest. The RTD temperature probe runs $25-45 for the part and honestly takes maybe 20-30 minutes to swap out if you've never done it before. You just pull the oven out, disconnect the probe connector at the back, pull the probe out of the cavity (one screw usually), and reverse the process with the new one. Control board codes like F34, F7, and F64 are a whole different situation. The board itself is $280-500 and that's before you factor in labor if you're not doing it yourself.
Should I try a power cycle before calling a technician?
Yes, always do this first. Flip the circuit breaker off for 60 full seconds, then back on. F7 specifically clears on its own pretty often if it was triggered by a voltage spike rather than an actual component failure. I'd say maybe 25-30% of the F7 calls I get would've resolved with a proper power cycle before anyone called me. F24 and PROBE almost never clear because the probe is physically broken, but it's still worth trying. If the code doesn't come back in 24 hours after the reset, you're probably fine.
How much does it cost to repair a Thermador oven control board?
The control board, OEM part number 00484225, runs $280-500 depending on where you buy it. Add professional labor and you're probably looking at $450-700 total for the repair. That's a real number to weigh against the oven's age. If it's under 8 years old, repair it. If it's over 12 and you're staring at a board replacement, start pricing new ovens because Thermador replacements run $2,800-8,000 and that board could fail again anyway. Between 8-12 years it kind of depends on the overall condition of the appliance.
Can I still use my Thermador oven while it's showing an F-code?
Honestly, no. When an F-code is active the oven shuts off heating on purpose, so even if you clear the error and try to cook, it's probably going to fault out again mid-cycle. Worse, if it's an F24 or PROBE situation and the control board can't read the temperature properly, the oven doesn't actually know if it's at 200°F or 600°F. That's a real fire risk. Just don't use it until the fault is fixed. A Thanksgiving turkey isn't worth it.