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Error code reference

Bosch Washer Error Code d:11

Voltage too low

Bosch codesBosch washer codes

Voltage too low — faulty motor control.

First step from the service manual

Run test P4; replace faulty motor control.

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

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What d:11 means on a Bosch washer

Error code d:11 on a Bosch washer indicates that the motor control unit is detecting a voltage level that is too low to operate the drive motor safely and correctly. The motor control board is responsible for regulating power delivery to the wash motor, managing speed, torque, and direction throughout the cycle. When input voltage drops below the acceptable threshold, the control board triggers this fault code and halts operation to prevent damage to the motor and associated electronics.

Low voltage conditions can originate from the household power supply, the internal wiring harness, or from a failing motor control board itself. A degraded or failing motor control unit may misread or fail to properly regulate voltage even when supply voltage is within normal range. This makes the motor control board a primary suspect alongside external power supply issues.

Diagnosing this fault begins with running the built-in test program P4, which is designed to evaluate motor control performance under controlled conditions. If P4 confirms abnormal motor control behavior or the low voltage condition cannot be attributed to the incoming power supply, the motor control unit should be replaced. Technicians should also inspect wiring connections between the control board and the motor for corrosion, loose terminals, or damage before condemning the board itself.

Source: manufacturer service documentation.

Common causes of d:11

  1. 01

    Faulty motor control board

    Part replacement

    The motor control board may be failing internally, causing it to misregulate or misread operating voltage. This is the primary suspect identified for d:11 and is confirmed through test program P4.

  2. 02

    Low incoming supply voltage

    Wiring / connection

    If the household outlet or circuit is delivering voltage below the required level, the motor control will flag this fault. Check the supply voltage at the outlet with a multimeter to rule this out before replacing any parts.

  3. 03

    Loose or corroded wiring connections

    Wiring / connection

    Damaged, loose, or corroded connectors between the power supply harness and the motor control board can cause intermittent low voltage readings. Inspect all terminals on the motor control board for oxidation or poor contact.

  4. 04

    Damaged wiring harness

    Part replacement

    A chafed or broken wire in the harness supplying the motor control unit can create resistance that causes a voltage drop. Visual inspection along the full length of the harness is recommended.

  5. 05

    Faulty drive motor

    Part replacement

    A motor drawing excessive current due to worn windings or bearing failure can cause the control board to detect abnormal voltage conditions. If the motor control board tests normal, the motor itself should be evaluated.

See the test procedure for each cause

Frequently asked questions about d:11

What does d:11 mean on a Bosch washer?
Error code d:11 on a Bosch washer means the motor control unit has detected a voltage level that is too low for safe motor operation. The washer stops the cycle automatically to prevent damage. This fault points to a problem with the motor control board, the incoming power supply, or the wiring between them. Diagnostic test P4 is used to confirm whether the motor control board is at fault.
Can I fix error code d:11 on my Bosch washer myself?
Some basic checks, such as verifying that the outlet is supplying proper voltage and inspecting visible wiring connections, can be done without special tools. However, running the required P4 diagnostic test and replacing the motor control board involves working with internal electronics and requires disassembly of the machine. Most homeowners will want a qualified technician to handle this repair.
Will resetting my Bosch washer clear the d:11 error code?
A reset may temporarily clear the d:11 code and allow the washer to attempt another cycle, but if the underlying cause is a failing motor control board or wiring issue, the error will return. Resetting does not fix the root problem. The fault should be properly diagnosed using test P4 before relying on the machine for normal use.
Is it safe to use my Bosch washer when it shows error d:11?
It is not recommended to continue using the washer while d:11 is active. The code indicates the motor control system is not operating within normal voltage parameters, and running the machine in this state risks further damage to the motor control board or drive motor. The washer should be diagnosed and repaired before resuming use.
How much does it cost to repair a Bosch washer with error code d:11?
Repair costs depend on whether the issue is a wiring problem or requires a motor control board replacement. Wiring repairs may fall in the range of $75 to $150 for a service call and labor. Motor control board replacement, including parts and labor, typically runs between $200 and $400 depending on the specific model and local labor rates.

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