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Error code reference

Bosch Washer Error Code E:06

NTC open-circuited

Bosch codesBosch washer codes

NTC open-circuited — 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 E:06 means on a Bosch washer

The E:06 error code on a Bosch washer indicates that the NTC (Negative Temperature Coefficient) thermistor has been detected as open-circuited. The NTC is a temperature-sensing resistor responsible for monitoring water temperature during the wash cycle. When functioning correctly, the NTC changes its resistance in a predictable, inverse relationship with temperature, allowing the control board to regulate heating accurately. An open circuit in this sensor means the control board is receiving no signal at all, which prevents safe temperature regulation and triggers the fault.

The two primary causes of this fault are a failed NTC sensor or a break in the wire harness connecting the sensor to the control board. A failed NTC will typically show infinite resistance when tested with a multimeter, indicating the internal element has broken. A damaged wire harness, including corroded terminals, broken wires, or loose connectors, can produce the same open-circuit reading even when the sensor itself is intact.

Diagnosis should begin by running test P16, which is the designated diagnostic routine for this fault on Bosch washers. After running P16, physically inspect the NTC sensor and trace the wire harness from the sensor back to the control board, checking for visible damage, corrosion, or disconnected terminals. Use a multimeter to confirm whether the open circuit is in the sensor or the wiring before ordering any replacement parts.

Source: manufacturer service documentation.

Common causes of E:06

  1. 01

    Failed NTC thermistor

    Part replacement

    The NTC sensor itself has developed an internal open circuit, causing it to stop transmitting resistance readings entirely. Testing with a multimeter will show infinite or no resistance, confirming the sensor needs replacement.

  2. 02

    Broken or damaged wire harness

    Part replacement

    A wire in the harness connecting the NTC to the control board has broken, frayed, or pulled free from a connector, interrupting the signal. Visually trace the harness and test continuity at each connector to locate the break.

  3. 03

    Corroded or loose connector terminals

    Wiring / connection

    Moisture exposure inside the washer can corrode the connector pins at either the NTC end or the control board end of the harness, creating an intermittent or complete open circuit. Inspect terminals closely and clean or reseat as needed.

  4. 04

    Intermittent wiring fault from vibration

    Wiring / connection

    Repeated machine vibration over time can work a connector loose or cause a wire to break internally at a stress point while appearing intact externally. Flex the harness gently during continuity testing to reveal intermittent breaks.

See the test procedure for each cause

Frequently asked questions about E:06

What does E:06 mean on a Bosch washer?
E:06 on a Bosch washer means the NTC temperature sensor has been detected as open-circuited, meaning the control board is receiving no signal from the sensor at all. This is caused by either a faulty NTC thermistor or a break somewhere in the wire harness connecting it to the board. The washer cannot safely control water heating without this sensor, so it halts operation and displays the fault code.
Can I fix the E:06 error myself?
Yes, this repair is within reach for a knowledgeable DIYer comfortable with basic electrical testing. Start by running diagnostic test P16 on your Bosch washer, then use a multimeter to check the NTC sensor for continuity and inspect the wire harness for breaks or corrosion. If the sensor tests as open-circuit, it can be replaced. If the harness is damaged, the affected section or connector will need to be repaired or replaced.
Is it safe to use my Bosch washer while the E:06 error is showing?
It is not recommended to continue running the washer with an active E:06 fault. Without a functioning temperature sensor, the control board cannot properly monitor or regulate water heating, which creates a risk of overheating the water or running cycles that do not meet the selected temperature settings. Resolve the fault before resuming normal use.
How much does it cost to repair the E:06 error on a Bosch washer?
If the NTC thermistor needs replacement, the part itself typically costs in the range of $15 to $50 depending on the specific model. If a professional technician is needed, total repair costs including labor generally fall in the $100 to $250 range. A damaged wire harness repair can vary depending on the extent of the damage and whether a full harness or just a connector is involved.
Will resetting my Bosch washer clear the E:06 error?
Resetting the washer may temporarily clear the E:06 code from the display, but the fault will return as soon as the control board attempts to read the NTC sensor again and detects the open circuit. A reset does not fix the underlying hardware problem. The NTC sensor or wire harness must be diagnosed and repaired for the error to clear permanently.

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