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Error code reference

Thermador Range Error Code F114

Runaway lower oven temperature exceeding 950°F.

Thermador codesThermador range codes

Runaway lower oven temperature exceeding 950°F.

First step from the service manual

Check P24 connector on Power Board; check lower 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 F114 means on a Thermador range

The F114 error code on a Thermador range indicates a runaway temperature condition in the lower oven, where the oven's internal temperature has exceeded 950 degrees Fahrenheit. This is a safety-critical fault. The control system monitors oven temperature continuously through a resistance-based temperature sensor, and when readings indicate the lower oven has gone beyond this threshold without appropriate shutoff, the board flags F114 to protect the appliance and surrounding cabinetry from thermal damage.

The lower oven temperature sensor operates on a predictable resistance curve, reading approximately 1080 ohms at room temperature. If the sensor has drifted, shorted, or failed, it can send inaccurate temperature data to the Power Board, causing the board to misread actual oven conditions and allow the heating element to run unchecked. Conversely, a faulty Power Board may misinterpret correct sensor data, failing to cut power to the element when temperatures climb too high. Wiring issues between the sensor, Power Board, and heating element can also create erratic signals that trigger this fault.

Diagnosis begins at the P24 connector on the Power Board, which should be inspected for corrosion, loose pins, or heat damage. From there, the lower sensor resistance should be measured and compared against the expected value of approximately 1080 ohms at room temperature. If the sensor tests within spec, the Power Board is the likely culprit and should be replaced. Wiring to the heating element should also be inspected for signs of arcing, melting, or continuity breaks.

Source: manufacturer service documentation.

Common causes of F114

  1. 01

    Faulty lower oven temperature sensor

    Part replacement

    A failed or drifted temperature sensor sends inaccurate resistance readings to the Power Board, causing the control system to lose track of actual oven temperature and allow overheating. Measure resistance at the sensor leads and compare to the expected value of approximately 1080 ohms at room temperature.

  2. 02

    Defective Power Board

    Part replacement

    If the lower oven sensor tests within normal resistance specs, the Power Board itself may be failing to process temperature data correctly or to cut power to the heating element when temperatures exceed safe limits. In this case, the Power Board should be replaced.

  3. 03

    Loose or corroded P24 connector on the Power Board

    Wiring / connection

    A poor connection at the P24 connector can disrupt the signal between the temperature sensor and the Power Board, producing erratic or false temperature readings that trigger the F114 fault. Inspect the connector for bent pins, corrosion, or loose seating.

  4. 04

    Wiring damage between the Power Board and heating element

    Part replacement

    Damaged, arced, or melted wiring in the circuit between the Power Board and the lower heating element can cause the element to operate outside of normal control, contributing to unregulated temperature rise. Inspect all wiring in this circuit for visible damage and verify continuity.

  5. 05

    Stuck or shorted heating element relay

    Part replacement

    If the relay controlling the lower heating element is stuck in the closed position, the element will continue receiving power regardless of temperature sensor input, causing runaway heating. This condition is typically traced back to the Power Board.

See the test procedure for each cause

Frequently asked questions about F114

What does F114 mean on a Thermador range?
F114 indicates that the lower oven temperature exceeded 950 degrees Fahrenheit in a runaway condition, meaning the oven could not regulate or stop the heat rise. This is a safety fault that shuts down the oven to prevent damage. It points to a problem with the lower temperature sensor, the Power Board, or the wiring and connections between those components.
Is it safe to use my Thermador range while F114 is active?
No, the range should not be used while F114 is active. A runaway temperature condition above 950 degrees Fahrenheit poses a serious risk of damage to the oven cavity, surrounding cabinetry, and potentially a fire hazard. The oven should remain off until the root cause is identified and repaired.
Will resetting the range clear the F114 error code?
Resetting the range by cycling the power may temporarily clear the F114 code, but the fault will return if the underlying problem is not fixed. The oven should not be considered safe to operate just because the code has been cleared. Proper diagnosis of the sensor, P24 connector, Power Board, and element wiring is necessary to resolve the fault permanently.
How do I diagnose and fix the F114 error on a Thermador range?
Start by inspecting the P24 connector on the Power Board for corrosion or loose pins. Next, measure the resistance of the lower oven temperature sensor, which should read approximately 1080 ohms at room temperature. If the sensor is within spec, the Power Board is likely faulty and should be replaced. Wiring between the Power Board and the heating element should also be checked for damage or continuity issues.
How much does it cost to repair a Thermador range showing F114?
Repair costs depend on which component has failed. A replacement lower oven temperature sensor typically runs in the range of $20 to $60 for the part, while a Power Board replacement can cost anywhere from $150 to $400 or more depending on the model. Adding professional labor, total repair costs commonly fall between $200 and $600, though complex wiring repairs or multiple failed components can push costs higher.

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