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Error code reference

Bosch Range Error Code ER13

Electric cooktop MTwisT control invalid EPROM data.

Bosch codesBosch range codes

Electric cooktop MTwisT control invalid EPROM data.

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What ER13 means on a Bosch range

ER13 on a Bosch range with an electric cooktop indicates that the MTwisT control module has detected invalid or corrupt data in its EPROM (Electrically Programmable Read-Only Memory). The EPROM is a non-volatile memory chip embedded in the control board that stores calibration settings, configuration parameters, and firmware instructions specific to the cooktop's operation. When the MTwisT control system attempts to read from this memory during startup or normal operation and receives data that fails its internal integrity checks, it triggers the ER13 fault and typically disables cooktop function as a safety measure.

The MTwisT control system is Bosch's touch and rotation interface used on select electric cooktops, integrating both capacitive touch sensing and rotary encoder inputs. This system relies on its EPROM data to correctly interpret user input, manage power levels, and coordinate with the induction or radiant heating elements. Corrupt EPROM data can result from a sudden power interruption during a write cycle, a voltage spike or surge reaching the control board, or simple age-related degradation of the memory cells over time.

In most cases, this error points directly to a failed or corrupted control board rather than a peripheral wiring or sensor issue. Unlike some fault codes that can be resolved through a reset or by addressing an external component, invalid EPROM data generally cannot be repaired in the field. The control board typically requires replacement, as EPROM reprogramming is not a standard field-service procedure for this platform.

Source: manufacturer service documentation.

Common causes of ER13

  1. 01

    Failed or corrupted control board EPROM

    Part replacement

    The memory chip on the MTwisT control board has developed corrupt data due to age, power events, or internal failure. This is the most direct cause of ER13 and typically requires full control board replacement.

  2. 02

    Power surge or voltage spike

    Part replacement

    A sudden electrical surge can corrupt data stored in the EPROM during a write operation or damage the memory cells outright. Check for signs of burn marks or damaged components on the control board.

  3. 03

    Power interruption during EPROM write cycle

    Wiring / connection

    If power was lost while the control board was saving data, the EPROM may have been left with incomplete or invalid data. A reset may occasionally resolve this, but a board replacement is often still needed.

  4. 04

    Loose or corroded wiring connections to the control board

    Wiring / connection

    Poor electrical connections supplying the control board can cause intermittent voltage irregularities that contribute to memory errors. Inspect all connectors at the control board for corrosion, looseness, or heat damage.

  5. 05

    End-of-life EPROM memory cell degradation

    Part replacement

    Over many years of use, EPROM memory cells can degrade and fail to retain valid data reliably. This is more common on older units and indicates the control board has reached the end of its service life.

See the test procedure for each cause

Frequently asked questions about ER13

What does ER13 mean on a Bosch range?
ER13 indicates that the electric cooktop's MTwisT control module has detected invalid or corrupt data in its EPROM memory chip. The EPROM stores the configuration and calibration data the control system needs to operate. When this data is unreadable or fails integrity checks, the cooktop displays ER13 and disables normal operation. This fault typically requires control board replacement to resolve.
Can I fix ER13 on my Bosch range myself?
A basic power reset by unplugging the unit or cycling the circuit breaker for a few minutes is worth attempting first, as it may clear the code if the corruption was caused by a one-time power interruption. However, if the EPROM data is genuinely corrupted or the memory chip has failed, the fault will return because the underlying hardware cannot be reprogrammed in the field. Replacing the MTwisT control board is the standard repair for a persistent ER13 error.
Is it safe to use my Bosch range while ER13 is displayed?
The cooktop portion of the range is likely disabled or unreliable while ER13 is active, as the control system cannot verify it has valid operating parameters. Attempting to use the cooktop in this condition is not recommended, as the control module may not correctly regulate power to the heating elements. The oven function on the range may still operate independently depending on the model.
How much does it cost to repair a Bosch range showing ER13?
Repair costs typically depend on whether the control board can be sourced and whether you use a professional technician or attempt the repair yourself. Control board parts for Bosch electric cooktops generally range from around 150 to 400 dollars depending on the specific model. Professional labor for diagnosis and board replacement adds roughly 100 to 200 dollars on top of parts costs.
Will resetting my Bosch range clear the ER13 error code?
A power reset by turning off the circuit breaker for several minutes can sometimes clear ER13 if the corruption was caused by a temporary power interruption rather than a hardware failure. If the code clears and does not return, normal operation may resume. However, if the EPROM itself is faulty or the data corruption is permanent, the error will reappear after reset and the control board will need to be replaced.

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