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Error code reference

Bosch Washer Error Code dr:06

NTC relay failure

Bosch codesBosch washer codes

NTC relay failure — NTC too hot or relay stuck closed.

First step from the service manual

Run test P4; check NTC and relay.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What dr:06 means on a Bosch washer

The dr:06 error code on a Bosch washer indicates a failure in the NTC (Negative Temperature Coefficient) thermistor circuit, specifically related to either an overtemperature condition or a relay that has become stuck in the closed position. The NTC thermistor is a resistive temperature sensor used by the control board to monitor wash water temperature in real time. When the NTC reports a temperature that exceeds safe operating thresholds, or when the heating relay remains closed and continues to supply power to the heating element even after the control board has signaled it to open, the machine triggers this fault to prevent damage or a safety hazard.

A stuck relay is a particularly important failure mode to understand. If the relay contacts weld or fuse together due to arcing or repeated high-current switching, the heater circuit remains energized regardless of control board commands. This can cause the water temperature to climb unchecked, which the NTC then detects as an overtemperature condition. In some cases, the NTC sensor itself may be the primary fault, either due to degraded resistance characteristics or an open circuit, causing the board to misread the temperature.

Diagnostic procedure P4 is the recommended starting point for this fault. This test routine isolates the NTC sensor and the associated relay so a technician can evaluate whether the fault originates with the sensor, the relay, or the wiring between these components and the control board. Checking resistance values from the NTC at a known temperature and verifying relay switching behavior are the key steps in confirming the root cause.

Source: manufacturer service documentation.

Common causes of dr:06

  1. 01

    Stuck closed heating relay

    Part replacement

    The relay that controls the heating element has fused or welded shut, keeping the heater on continuously. This causes water temperature to rise beyond safe limits and triggers the dr:06 fault. Confirming this requires checking whether the heater circuit remains powered even when the control board commands the relay to open.

  2. 02

    Faulty NTC thermistor

    Part replacement

    The NTC sensor has drifted out of its correct resistance range or has failed entirely, causing the control board to receive inaccurate temperature data. Run test P4 and measure the thermistor resistance to determine if it falls within specification.

  3. 03

    Wiring or connector fault in NTC circuit

    Wiring / connection

    Corroded, loose, or damaged wiring between the NTC thermistor and the control board can cause erratic or out-of-range temperature readings. Inspect the harness connectors at both the sensor and board ends for signs of heat damage, corrosion, or broken pins.

  4. 04

    Control board relay driver failure

    Part replacement

    The control board itself may have a failed relay driver circuit that cannot properly open or close the relay on command. If the relay and NTC sensor both test within normal parameters, the control board becomes the likely suspect.

See the test procedure for each cause

Frequently asked questions about dr:06

What does dr:06 mean on a Bosch washer?
The dr:06 code indicates an NTC thermistor relay failure. It is triggered when the washer detects that the water temperature is too high or that the heating relay is stuck in the closed position, meaning the heater cannot be properly shut off. The machine stops operation to prevent overheating damage or a safety hazard.
Can I fix the dr:06 error myself?
Diagnosing this error requires running the built-in test P4 and using a multimeter to check the NTC thermistor resistance and relay behavior. A DIYer comfortable with electrical testing and disassembling a washer cabinet can perform these checks. However, if the relay or control board needs replacement, the repair involves working with high-voltage components and is best handled by a qualified technician.
Will resetting the washer clear the dr:06 error?
A power reset may temporarily clear the displayed code, but the underlying fault will almost certainly cause it to return. If the relay is physically stuck closed or the NTC thermistor has failed, the fault condition still exists after a reset. The root cause must be diagnosed and repaired before the washer will operate reliably.
Is it safe to use my Bosch washer while the dr:06 code is active?
No, you should not continue using the washer until this fault is resolved. A stuck closed relay means the heating element may remain on without control, which poses a risk of overheating the water and potentially damaging internal components. The machine's safety system triggers this code specifically to halt operation and prevent further harm.
How much does it cost to repair a dr:06 error on a Bosch washer?
Repair costs vary depending on which component has failed. Replacing an NTC thermistor is generally the least expensive fix, typically falling in the range of $50 to $150 including parts and labor. A relay or control board replacement can be more costly, often ranging from $150 to $400 or more depending on parts pricing and local labor rates.

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