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Error code reference

Bosch Range Error Code E044

Touch control module (TCM) option code error

Bosch codesBosch range codes

Touch control module (TCM) option code error — TCM board or connections to TCM are bad; during start-up the control module is unable to set TCM option code.

First step from the service manual

Enter Service mode to set correct option code. Check connection to control module. Check connection to TCM. If unable to set option code and connections are good, replace front panel assembly.

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

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What E044 means on a Bosch range

The E044 error code on a Bosch range indicates a Touch Control Module (TCM) option code error. During the startup sequence, the main control module attempts to read and set a configuration option code from the TCM board. If the control module cannot successfully complete this handshake or write the correct option code to the TCM, the E044 fault is triggered and stored. This is a communication-level failure between two boards rather than a simple sensor fault.

The TCM is the circuit board embedded within the front panel assembly that interprets touch inputs from the user interface. The main control module must recognize and configure the TCM correctly at startup using a specific option code that matches the range's build configuration. If the wiring harness connections between the main control board and the TCM are loose, corroded, or damaged, the control module may be unable to complete this initialization process, resulting in E044.

Diagnosis begins in Service mode, where a technician can attempt to manually set the correct option code. If the option code can be set successfully after accessing Service mode, the fix may be as simple as correcting a configuration issue. If the connections between the control module and the TCM check out physically but the option code still cannot be set, the front panel assembly containing the TCM board requires replacement. A failed TCM board that will not accept the option code under any circumstances is not field-repairable at the component level.

Source: manufacturer service documentation.

Common causes of E044

  1. 01

    Loose or disconnected wiring harness

    Wiring / connection

    The cable connecting the main control module to the TCM may have worked loose over time due to vibration or handling. Inspect both ends of the harness for secure seating and signs of corrosion or bent pins.

  2. 02

    Incorrect or unconfigured option code

    Wiring / connection

    The TCM option code may have been lost or never set, particularly after a control board replacement. Entering Service mode and setting the correct option code for the range's configuration can resolve this without replacing any parts.

  3. 03

    Failed TCM board within the front panel assembly

    Part replacement

    If connections are intact and the option code cannot be set via Service mode, the TCM board itself has likely failed and is not accepting configuration data. The front panel assembly containing the TCM must be replaced.

  4. 04

    Damaged wiring harness

    Part replacement

    Physical damage to the harness between the main control module and the TCM, such as pinched or burned wires, can prevent reliable communication. Inspect the full length of the harness for insulation damage or broken conductors.

  5. 05

    Failed main control module

    Part replacement

    In less common cases, the main control module itself may be unable to execute the option code write routine due to internal failure. This is typically only considered after confirming the TCM connections and front panel assembly are both in good condition.

See the test procedure for each cause

Frequently asked questions about E044

What does E044 mean on a Bosch range?
E044 indicates a Touch Control Module option code error. During startup, the main control module attempts to set a configuration code on the TCM board in the front panel. If this process fails due to bad connections or a faulty TCM, the E044 fault is logged. The range cannot operate normally until the option code is successfully set.
Can I fix E044 on my Bosch range myself?
A technician comfortable with appliance electronics can attempt to resolve E044 by entering Service mode and setting the correct option code, then inspecting all wiring harness connections between the control module and the front panel. If the connections are secure and the option code still cannot be set, the front panel assembly will need to be replaced, which is a more involved repair. Homeowners without experience accessing appliance service modes or working with wiring harnesses should consider calling a qualified technician.
Is it safe to use my Bosch range while E044 is displayed?
E044 is a control communication fault that typically prevents normal startup of the range. Because the touch interface may not function reliably, attempting to operate the appliance in this state is not recommended. The burners or oven may not respond predictably, creating a potential safety concern.
Will resetting my Bosch range clear the E044 error?
A simple power reset is unlikely to permanently clear E044 because the fault is caused by a structural issue, either a bad connection or a failed TCM board, that the control module will detect again on the next startup cycle. The correct fix involves entering Service mode to set the option code or replacing the front panel assembly if connections are confirmed to be good.
How much does it cost to repair a Bosch range showing E044?
If the issue is resolved by setting the option code in Service mode or reseating a wiring connection, the cost is primarily labor, which typically ranges from around 80 to 150 dollars depending on your area. If the front panel assembly containing the TCM board requires replacement, parts and labor combined could range from 200 to 500 dollars or more, depending on the specific range model and part availability.

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