Thermador Oven Error Code E335: How to Fix It

Q: Is it safe to use my Thermador oven while it shows error code E335?

No, it is not recommended. The E335 error means the secondary thermistor is shorted, so the oven cannot accurately monitor its internal temperature. This could result in overheating or unpredictable cooking performance. Most Thermador ovens will lock out or shut down when this error is active specifically as a safety measure. Do not attempt to use the oven until the issue is resolved.

Q: What is a secondary thermistor and how is it different from the main temperature probe?

A thermistor is a resistor whose resistance changes with temperature, allowing the oven's control board to monitor heat levels. The main temperature probe (sometimes called the primary thermistor or bake sensor) monitors the general oven cavity temperature. The secondary thermistor provides a second reference point — often near the broil or convection element — to ensure accurate and even heat control. Both are important for safe oven operation.

Q: How much does it cost to fix Thermador oven error code E335?

If you do the repair yourself, the secondary thermistor replacement part typically costs between $20 and $60 depending on your model. If you hire a professional appliance technician, expect to pay $100–$200 or more in labor on top of the part cost. If the control board is also involved, total repair costs can climb to $300–$500 or higher.

Q: Can a power surge cause the E335 error on a Thermador oven?

Yes, a power surge can temporarily trigger sensor-related error codes including E335 by corrupting the signal the control board receives from the thermistor. That is why the first step is always to reset the oven by cutting power at the breaker for several minutes. If the error disappears after a reset and does not return, a transient electrical event was likely the cause. If it comes back, a genuinely faulty thermistor or wiring issue is the culprit.

Q: How do I find the model number on my Thermador oven to order the right thermistor?

The model number label on most Thermador wall ovens and ranges is located on the inside frame of the oven door — open the door and look along the top or side edge of the door frame. On some models it may be inside the storage drawer at the bottom of a range. The model number will be on a sticker and usually starts with letters like 'POD', 'ME', or 'HMC' followed by numbers. Use this model number when searching for a compatible replacement thermistor.

Abstract

The Thermador oven error code E335 indicates a short circuit in the secondary thermistor, which is a temperature sensor that helps your oven monitor and regulate heat accurately. When this sensor shorts out, the oven's control board receives incorrect temperature readings, which can cause the oven to shut down or refuse to operate as a safety precaution. This is a medium-severity issue — your oven is unlikely to work normally until the faulty thermistor is identified and replaced.