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Error code reference

Bosch Washer Error Code dr:03

Damaged motor control temperature sensor

Bosch codesBosch washer codes

Damaged motor control temperature sensor — faulty temperature sensor.

First step from the service manual

Run test P4; check/replace temperature sensor.

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

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What dr:03 means on a Bosch washer

The dr:03 error code on a Bosch washer indicates a fault with the temperature sensor located within the motor control unit. This sensor monitors the operating temperature of the motor control board and its associated electronics. When the control system detects that the sensor is producing readings outside of expected parameters, either due to an open circuit, a short circuit, or erratic signal output, it logs dr:03 and may halt operation to prevent thermal damage to internal components.

The temperature sensor in the motor control assembly is a thermistor-type component, meaning its resistance changes predictably with temperature. A damaged or failed thermistor can report falsely elevated or falsely low temperatures, causing the control board to make incorrect decisions about motor operation and cooling. Common failure modes include physical damage to the sensor element, degraded solder connections on the control board, or wiring harness issues between the sensor and the control module.

Diagnosis begins with running test program P4, which exercises the motor control system and allows the technician to isolate whether the fault is in the sensor itself or in the surrounding circuitry. If P4 confirms the fault, the technician should inspect the sensor wiring harness for chafing, corrosion, or loose connectors before condemning the sensor outright. If wiring checks out, the temperature sensor or the motor control unit containing it will need to be replaced.

Source: manufacturer service documentation.

Common causes of dr:03

  1. 01

    Failed motor control temperature sensor

    Part replacement

    The thermistor sensor itself has degraded or failed, producing out-of-range resistance values that the control board cannot interpret correctly. This is the most direct cause and is confirmed by running test P4 and checking sensor output.

  2. 02

    Damaged wiring harness or connector

    Wiring / connection

    The wiring connecting the temperature sensor to the motor control board may have chafed, corroded terminals, or a loose connector, interrupting the signal. Inspect the harness visually and check for continuity before replacing any components.

  3. 03

    Poor solder joint on motor control board

    Wiring / connection

    A cracked or cold solder joint at the sensor connection point on the control board can cause intermittent or total signal loss. This may appear as an error that comes and goes depending on vibration or temperature.

  4. 04

    Faulty motor control unit

    Part replacement

    If the sensor and wiring both test acceptable, the motor control unit itself may have an internal fault affecting the sensor input circuit, requiring the entire control module to be replaced.

See the test procedure for each cause

Frequently asked questions about dr:03

What does dr:03 mean on a Bosch washer?
The dr:03 code indicates a damaged or faulty temperature sensor within the motor control system of your Bosch washer. The sensor is responsible for monitoring heat levels in the motor control electronics. When this sensor produces readings outside acceptable limits or fails entirely, the washer logs dr:03 and may stop operating to protect its components.
How do I fix the dr:03 error on my Bosch washer?
The recommended first step is to run diagnostic test program P4, which helps isolate whether the fault is in the temperature sensor, the wiring harness, or the motor control board itself. Inspect all connectors and wiring leading to the sensor for damage or corrosion. If the wiring is intact and P4 confirms a sensor fault, the temperature sensor or motor control unit will need to be replaced.
Is it safe to use my Bosch washer when dr:03 is displayed?
It is not advisable to continue using the washer while dr:03 is active. The temperature sensor is there to protect the motor control electronics from overheating, and operating the machine without a functioning sensor could allow undetected heat buildup that damages the control board or other components. Resolving the fault before resuming use is the safer approach.
Will resetting my Bosch washer clear the dr:03 error?
A power reset may temporarily clear the error from the display, but the code will return if the underlying sensor fault has not been repaired. Because the cause is a hardware failure rather than a transient software glitch, the sensor or related wiring needs to be inspected and corrected for the error to stay resolved.
How much does it cost to repair a dr:03 error on a Bosch washer?
Repair costs vary depending on whether the fault is in the wiring, the sensor, or the full motor control unit. A wiring repair or sensor-only replacement is generally less expensive, typically in the range of $100 to $250 including labor. If the entire motor control board requires replacement, costs can range from $250 to $500 or more depending on parts availability and local labor rates.

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