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Error code reference

Bosch Range Error Code E009

ROM-check error in user interface

Bosch codesBosch range codes

ROM-check error in user interface – ROM-check performed at reset fails; all heating elements disabled.

First step from the service manual

Replace user interface.

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

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What E009 means on a Bosch range

The E009 error code on a Bosch range indicates a ROM-check failure in the user interface control board. ROM, or Read-Only Memory, stores the firmware that governs the interface board's core functions. During every reset cycle, the control system performs an integrity check of this memory. If the checksum or verification routine detects corrupted, missing, or unreadable data in the ROM, the system flags E009 and immediately disables all heating elements as a safety precaution.

The user interface board is the primary component involved in this fault. This board handles button inputs, display output, and communicates operating commands to the main control board. When its ROM fails the startup check, the range treats the interface as non-functional and prevents any cooking operation from proceeding. This is a deliberate design behavior to avoid unsafe or unpredictable heating activity driven by a compromised control program.

Corruption of the ROM can result from power surges, voltage spikes during a storm or grid fluctuation, or gradual component degradation over time. In some cases, a brief power interruption that occurs mid-cycle can leave the firmware in an unreadable state. Because the ROM is embedded within the user interface board itself and cannot be reflashed in the field, the standard corrective action is full replacement of the user interface assembly.

Source: manufacturer service documentation.

Common causes of E009

  1. 01

    Failed user interface board

    Part replacement

    The ROM chip embedded in the user interface board has become corrupted or has failed, causing it to fail the startup integrity check. This is the primary and most likely cause, and replacement of the board is the prescribed repair.

  2. 02

    Power surge or voltage spike

    Part replacement

    A sudden voltage spike from a storm, grid event, or appliance cycling on the same circuit can corrupt ROM data on the interface board. If the error appeared after a power event, surge damage to the board is a strong possibility.

  3. 03

    Power interruption during firmware operation

    Wiring / connection

    A power outage or brownout that occurred while the range was in use can leave the interface board's memory in an inconsistent state that fails subsequent ROM checks.

  4. 04

    Loose or damaged wiring harness connection

    Wiring / connection

    A poor connection between the user interface board and the main control board can disrupt communication and cause the ROM check to fail. Inspect connectors for corrosion, loose pins, or visible damage before condemning the interface board.

See the test procedure for each cause

Frequently asked questions about E009

What does E009 mean on a Bosch range?
E009 on a Bosch range indicates a ROM-check error in the user interface control board. The range runs a memory integrity check each time it resets, and if that check fails, E009 is triggered. As a safety measure, all heating elements are immediately disabled until the fault is resolved. The user interface board will need to be replaced to clear the error.
Can I fix E009 on my Bosch range myself?
A technician-level repair is recommended for E009. The fix requires replacing the user interface board, which involves working with electrical components inside the appliance. While a knowledgeable DIYer familiar with appliance disassembly may be able to perform the swap, it is important to disconnect power completely before starting and to handle the board carefully to avoid damage to connectors or surrounding components.
Is it safe to use my Bosch range while E009 is displayed?
No. When E009 is active, the range automatically disables all heating elements, so the cooktop and oven will not operate. The range is not safe or functional for cooking in this state. Do not attempt to bypass the error, and address the fault before resuming any cooking activity.
Will resetting my Bosch range clear the E009 error?
A power reset is unlikely to permanently clear E009 because the fault is caused by a hardware failure in the interface board's ROM. The ROM-check runs at every reset, so if the board's memory is corrupted or defective, the error will return each time the range powers on. A reset may temporarily clear the display in some cases, but the underlying fault requires board replacement.
How much does it cost to repair an E009 error on a Bosch range?
Repair costs for E009 will vary depending on the specific model and whether you use a professional technician or source the part yourself. User interface boards for Bosch ranges typically range from around 150 to 400 dollars for the part alone. Adding professional labor, total repair costs commonly fall in the range of 250 to 600 dollars. Getting a quote from a certified technician before proceeding is advisable.

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