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Error code reference

Bosch Washer Error Code Er:06

NTC shorted

Bosch codesBosch washer codes

NTC shorted — faulty NTC or bad wire harness.

First step from the service manual

Run test P16; check NTC and wire harness.

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

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What Er:06 means on a Bosch washer

Er:06 on a Bosch washer indicates a shorted NTC (Negative Temperature Coefficient) thermistor, the sensor responsible for monitoring water temperature during wash and rinse cycles. An NTC thermistor works by varying its electrical resistance in response to temperature changes. When the control board detects a resistance value that falls below the expected minimum threshold, it interprets this as a short circuit in the sensor circuit and triggers Er:06 to prevent potential overheating or incorrect temperature-based cycle control.

The two primary causes are a failed NTC thermistor itself or a fault in the wire harness connecting the thermistor to the control board. A shorted thermistor typically results from internal component failure, moisture ingress, or physical damage to the sensor body. Wire harness faults can include chafed insulation causing wires to contact each other or a grounded chassis point, pinched harness sections, or corroded connector pins that create an unintended low-resistance path.

Diagnosis begins with running test program P16, which allows the control board to actively evaluate the NTC circuit. Following that, the technician should disconnect the NTC connector and measure the thermistor resistance directly with a multimeter. A shorted NTC will read near zero ohms rather than the expected resistance range for its temperature. If the thermistor resistance reads correctly in isolation, the wire harness should be inspected for shorts to ground or between conductors along its entire run from the sensor to the control board connector.

Source: manufacturer service documentation.

Common causes of Er:06

  1. 01

    Failed NTC thermistor (internal short)

    Part replacement

    The NTC thermistor itself has failed internally, causing it to read near zero resistance regardless of water temperature. This is the most common cause and can be confirmed by measuring thermistor resistance directly after disconnecting it from the harness.

  2. 02

    Shorted wire harness

    Part replacement

    The wiring between the NTC thermistor and the control board has developed a short, either between conductors or to the machine chassis. Inspect the harness for chafed insulation, pinch points, or damage from vibration over time.

  3. 03

    Corroded or damaged connector pins

    Wiring / connection

    Moisture or detergent exposure can corrode the connector terminals at the NTC or control board end, causing unintended electrical contact between pins. Check both connector ends for discoloration, buildup, or bent pins.

  4. 04

    Moisture intrusion at the sensor

    Wiring / connection

    Water entering the thermistor housing or its connector can create a low-resistance path that mimics a short circuit. Inspect the sensor mounting location and connector for signs of water ingress or residue.

See the test procedure for each cause

Frequently asked questions about Er:06

What does Er:06 mean on a Bosch washer?
Er:06 means the control board has detected a short circuit in the NTC thermistor circuit, the component that monitors water temperature. The fault can originate from a failed thermistor or from the wire harness connecting it to the control board. The washer will not operate normally until the short is identified and corrected.
How do I fix Er:06 on my Bosch washer?
Start by running test program P16 to confirm the fault is active in the NTC circuit. Then disconnect the NTC thermistor and measure its resistance with a multimeter. If it reads near zero ohms, the thermistor needs replacement. If the thermistor tests correctly in isolation, trace the wire harness for signs of damage, chafing, or shorted conductors and repair or replace the affected section.
Is it safe to use my Bosch washer when Er:06 is showing?
It is not recommended to continue using the washer while Er:06 is active. A shorted temperature sensor means the machine cannot accurately monitor or control water temperature, which could result in incorrect cycle performance or potential overheating. The washer should be diagnosed and repaired before resuming normal use.
Will resetting my Bosch washer clear the Er:06 code?
A reset may temporarily clear the error display, but the code will return as soon as the control board re-evaluates the NTC circuit and detects the short again. Because the underlying cause is a hardware fault in the sensor or wiring, resetting the machine does not resolve the problem and is not a substitute for proper diagnosis and repair.
How much does it cost to repair an Er:06 error on a Bosch washer?
Repair costs vary depending on what has failed. Replacing an NTC thermistor is generally a lower-cost repair, with parts typically ranging from $15 to $50 and professional labor adding $75 to $150 depending on your area. If the wire harness requires repair or replacement, costs can be higher. Diagnosing the fault accurately with test P16 before ordering parts helps avoid unnecessary expenses.

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