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Error code reference

Thermador Range Error Code F111

Runaway upper (or single) oven temperature exceeding 585°F or 650°F.

Thermador codesThermador range codes

Runaway upper (or single) oven temperature exceeding 585°F or 650°F.

First step from the service manual

Allow oven to cool down below 650°F before turning power on; check P4 connector; check sensor resistance (~1080 ohms at room temperature); if sensor OK replace Power Board; check wiring to heating element.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F111 means on a Thermador range

The F111 error code on a Thermador range indicates a runaway temperature condition in the upper oven cavity, or in the single oven on single-cavity models. Specifically, the control system has detected that the oven temperature has exceeded either 585°F or 650°F, which are the threshold limits built into the control logic to protect the appliance from thermal damage. This condition is distinct from a simple sensor failure: the control is actively reading a temperature value that is too high, meaning the heating element may be receiving continuous power without proper cycling, or the temperature sensor is reporting an inaccurate high value.

The primary components involved in this fault are the oven temperature sensor (RTD sensor), the P4 connector on the control board, the power board responsible for switching the heating element, and the wiring harness between these components. The temperature sensor should measure approximately 1080 ohms at room temperature. If the sensor resistance is within specification, the power board is the likely culprit, as a failed relay on the board can cause the heating element to remain energized continuously, driving oven temperature far above the setpoint.

Common root causes include a welded or stuck relay on the power board allowing uninterrupted current to the heating element, a faulty temperature sensor providing incorrect readings to the control, a loose or corroded P4 connector introducing signal errors, or a short or break in the wiring to the heating element. Because the oven must cool below 650°F before the control can be safely powered back on, any diagnostic work should begin only after the cavity has returned to a safe temperature.

Source: manufacturer service documentation.

Common causes of F111

  1. 01

    Failed relay on the power board

    Part replacement

    A welded or stuck relay on the power board can keep the heating element energized continuously, causing the oven temperature to climb without limit. If the temperature sensor checks out near 1080 ohms at room temperature, the power board is the most likely component requiring replacement.

  2. 02

    Faulty oven temperature sensor

    Part replacement

    A defective RTD temperature sensor can report inaccurate readings to the control, causing the system to either overheat or incorrectly log a runaway condition. Measure sensor resistance at room temperature and compare against the 1080 ohm specification to confirm or rule this out.

  3. 03

    Loose or corroded P4 connector

    Wiring / connection

    The P4 connector links the temperature sensor circuit to the control board. A loose, corroded, or poorly seated P4 connector can introduce signal errors that trigger a false runaway reading. Inspect and reseat this connector as one of the first diagnostic steps.

  4. 04

    Wiring fault to the heating element

    Wiring / connection

    Damaged, shorted, or improperly routed wiring between the power board and the heating element can cause unintended current flow or signal errors. Inspect the full wiring harness for signs of burning, pinching, or insulation damage.

  5. 05

    Heating element short circuit

    Part replacement

    A shorted heating element can draw excess current and generate heat beyond the normal operating range, contributing to a runaway temperature condition. Visual inspection for blistering or breaks in the element, combined with continuity testing, can help identify this issue.

See the test procedure for each cause

Frequently asked questions about F111

What does F111 mean on a Thermador range?
F111 indicates a runaway temperature condition in the upper or single oven cavity, where the oven temperature exceeded 585°F or 650°F. The control system shuts down to prevent thermal damage when this threshold is crossed. The fault involves the temperature sensor, power board, P4 connector, or the heating element wiring. The oven must cool below 650°F before power is restored and diagnostics can begin.
Is it safe to use my Thermador range when F111 is displayed?
No, you should not attempt to use the oven while F111 is active. The error indicates the oven reached a dangerously high temperature, and continued use could cause further component damage or create a fire hazard. Allow the oven to cool completely before inspecting it, and do not restore power until the cavity temperature has dropped below 650°F.
Will resetting the power clear the F111 error code?
A power reset may temporarily clear the F111 code, but the error will return if the underlying cause is not corrected. If the power board relay is stuck or the temperature sensor is faulty, the runaway condition will repeat. Resetting without diagnosing and repairing the root cause is not a reliable fix.
How do I fix the F111 error on a Thermador range?
Begin by allowing the oven to cool completely, then inspect and reseat the P4 connector on the control board. Measure the oven temperature sensor resistance, which should read approximately 1080 ohms at room temperature. If the sensor is within spec, the power board is the likely cause and should be replaced. Also inspect the wiring to the heating element for any damage.
How much does it cost to repair a Thermador range F111 error?
Repair costs depend on which component has failed. A replacement oven temperature sensor typically runs in the range of $30 to $80 for the part alone. A power board replacement is more expensive, generally ranging from $150 to $400 or more for the part, plus labor if a technician is performing the repair. Getting a diagnostic assessment before ordering parts is recommended to avoid unnecessary expense.

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