mypros+
Error code reference

Thermador Oven Error Code E115

Upper/single cavity (Cvt 1) temperature in unlocked cavity too high.

Thermador codesThermador oven codes

Upper/single cavity (Cvt 1) temperature in unlocked cavity too high.

MyPros+ Max

Get the full diagnostic procedure for E115.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E115 means on a Thermador oven

Error code E115 on a Thermador oven indicates that the upper or single cavity (designated as Converter 1, or Cvt 1) has detected a temperature that exceeds the acceptable threshold while the cavity door is in an unlocked state. This is a thermal protection fault, meaning the oven's control system has measured a temperature high enough to trigger a safety response. The control board continuously monitors cavity temperature through a sensor, and when readings climb beyond programmed limits outside of a locked self-clean cycle, E115 is generated.

The most likely source of this fault is a runaway heating condition, where one or more heating elements (bake, broil, or convection) remain energized beyond the expected duty cycle. This can happen due to a failed relay on the control board that stays closed and continuously supplies power to an element. A faulty temperature sensor (RTD or thermocouple) that reports artificially low readings could also cause the board to overheat the cavity without triggering earlier protection codes.

Additionally, restricted airflow around the oven cavity, a malfunctioning cooling fan, or a convection fan that has stopped circulating air can cause localized heat buildup that the sensor detects as an over-temperature condition. Because the error specifically references an unlocked cavity, any scenario that drives temperatures above normal operating ranges during standard cooking modes is within scope for this fault.

Source: manufacturer service documentation.

Common causes of E115

  1. 01

    Stuck relay on control board

    Part replacement

    A welded or stuck relay on the main control board can keep a heating element continuously energized, causing the cavity temperature to climb unchecked. This is one of the more common causes of over-temperature faults and typically requires control board replacement.

  2. 02

    Faulty oven temperature sensor

    Part replacement

    A defective RTD temperature sensor that reads lower than actual cavity temperature will cause the control board to continue heating past safe limits. Check the sensor's resistance value against the expected specification and replace it if readings are out of range.

  3. 03

    Failed convection or cooling fan

    Part replacement

    If the convection fan or cavity cooling fan has stopped operating, heat will not circulate or dissipate properly, leading to localized over-temperature conditions. Listen for fan operation during cooking and inspect the fan motor and blade for failure.

  4. 04

    Shorted or runaway heating element

    Part replacement

    A bake or broil element that has developed an internal short can draw power continuously regardless of control board commands. Visually inspect elements for burn marks, blistering, or visible breaks, and test for shorts with a multimeter.

  5. 05

    Restricted oven ventilation

    Wiring / connection

    Blocked oven vents caused by improper installation, debris, or objects placed too close to the appliance can trap heat inside the cavity. Check that all ventilation pathways are clear and that the oven is installed with proper clearances.

See the test procedure for each cause

Frequently asked questions about E115

What does E115 mean on a Thermador oven?
E115 indicates that the upper or single oven cavity detected a temperature that exceeded safe limits while the door was unlocked, meaning during normal cooking operation rather than a self-clean cycle. The oven control board triggered this fault as a safety measure to prevent damage or a hazard. Common causes include a stuck relay on the control board, a faulty temperature sensor, or a failed cooling or convection fan.
Can I fix E115 on my Thermador oven myself?
Some causes, such as blocked vents or a visually burned-out heating element, can be identified and addressed by a knowledgeable DIYer. However, diagnosing a faulty control board relay or a subtly defective temperature sensor requires a multimeter and familiarity with appliance electronics. If you are not comfortable working with high-voltage components, a qualified appliance technician should handle the repair.
Is it safe to keep using my Thermador oven when E115 appears?
No, you should not continue using the oven after E115 appears. The error indicates an over-temperature condition that the control system flagged as unsafe, and continued operation could damage internal components or create a fire hazard. Power the oven off and allow it to cool fully before attempting any inspection.
Will resetting my Thermador oven clear the E115 error?
A reset by cycling the circuit breaker or powering the oven off for several minutes may temporarily clear the fault code, but it will return if the underlying cause is not corrected. Resetting is useful as a first step to confirm whether the fault is intermittent or persistent, but it is not a repair. If E115 returns quickly after a reset, the root cause must be diagnosed and fixed.
How much does it cost to repair a Thermador oven showing E115?
Repair costs vary depending on the failed component. A replacement temperature sensor is typically in the range of $20 to $80 for the part, while a control board can cost between $150 and $400 or more. Adding labor charges from a qualified technician, total repair costs commonly fall between $150 and $600 depending on what needs to be replaced and your location.

Related Thermador oven codes

All Thermador oven codes
View all 103 Thermador oven codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass