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Error code reference

Thermador Range Error Code F151

EEPROM failure or communication circuit error.

Thermador codesThermador range codes

EEPROM failure or communication circuit error.

First step from the service manual

Check power and Display Board connectors P1B and associated wiring. If OK, replace Display Board. If fault persists, replace Power Board.

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

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What F151 means on a Thermador range

The F151 error code on a Thermador range indicates an EEPROM failure or a communication circuit error involving the Display Board. EEPROM (Electrically Erasable Programmable Read-Only Memory) is a type of non-volatile memory used by the control system to store critical configuration data, calibration settings, and operational parameters. When this memory fails or when the communication pathway between the Display Board and the Power Board is disrupted, the control system cannot read or write the data it needs to operate correctly, triggering the F151 fault.

The most common entry point for this fault is a connector issue at the Display Board, specifically at connector P1B and its associated wiring. Loose, corroded, or damaged connections at this point can interrupt the data signal between the Display Board and the Power Board, causing the system to register a communication failure even when the boards themselves are functional. Heat cycling and vibration over time can cause connectors to work loose or develop intermittent contact faults.

If wiring and connector inspection does not resolve the fault, the Display Board itself is the next suspect, as it houses the EEPROM or its associated communication circuitry. A failed EEPROM chip or corrupted memory on the Display Board will produce a persistent F151 regardless of connection quality. If replacing the Display Board does not clear the fault, the Power Board may have a defective communication circuit on its side of the interface, requiring board replacement to restore normal operation.

Source: manufacturer service documentation.

Common causes of F151

  1. 01

    Loose or damaged connector at P1B

    Wiring / connection

    The wiring connector P1B on the Display Board is the first place to check. A loose, corroded, or broken connection here disrupts communication between the Display Board and Power Board and can trigger the F151 fault without any board failure.

  2. 02

    Failed Display Board

    Part replacement

    If the P1B connector and wiring check out as intact, the Display Board itself may have a failed EEPROM chip or corrupted memory. This requires replacing the Display Board to restore normal operation.

  3. 03

    Damaged wiring harness between boards

    Part replacement

    The wiring between the Display Board and Power Board can develop breaks, shorts, or chafing damage over time. Inspect the full length of the harness for visible damage or continuity faults.

  4. 04

    Failed Power Board communication circuit

    Part replacement

    If replacing the Display Board does not clear the fault, the Power Board may have a defective communication circuit on its side of the interface. This is the least common cause but requires board replacement if confirmed.

See the test procedure for each cause

Frequently asked questions about F151

What does F151 mean on a Thermador range?
F151 on a Thermador range indicates an EEPROM failure or a communication circuit error between the Display Board and the Power Board. The EEPROM is a small memory chip that stores configuration and calibration data the range needs to operate. When this memory fails or the communication path is broken, the range cannot function normally and displays the F151 code. Diagnosis starts with inspecting the Display Board connector P1B and associated wiring.
Can I fix F151 on my Thermador range myself?
A knowledgeable DIYer can start by checking that the wiring connector P1B on the Display Board is fully seated and shows no signs of corrosion or damage. If the connector looks good and the fault persists, fixing the issue requires replacing the Display Board or Power Board, which involves working inside the range with the power disconnected. If you are not comfortable accessing internal components, a qualified appliance technician is recommended.
Will resetting the range clear the F151 error code?
Resetting the range by disconnecting power for a few minutes may temporarily clear the F151 code, but it will almost certainly return if the underlying hardware problem has not been addressed. EEPROM failures and board communication faults are hardware issues that do not resolve on their own. A reset is useful only as a quick test to confirm whether the fault is persistent.
Is it safe to use my Thermador range while F151 is displayed?
An active F151 fault means the control system cannot reliably read its stored settings and may not be able to accurately manage cooking functions. Using the range in this state is not recommended, as the control board may not regulate temperatures or respond to inputs correctly. It is best to stop using the appliance and have the fault diagnosed before resuming normal use.
How much does it cost to repair a Thermador range F151 error?
Repair costs vary depending on which component needs to be replaced and local labor rates. If only the wiring or connector needs attention, costs are minimal. If a Display Board replacement is required, parts and labor typically range from around $200 to $450. If the Power Board also needs to be replaced, the total repair cost could range from $350 to $600 or more depending on parts pricing and service fees in your area.

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