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Error code reference

Bosch Washer Error Code 38

Error of temperature sensor: short-circuit

Bosch codesBosch washer codes

Error of temperature sensor: short-circuit - NTC is broken.

First step from the service manual

Check NTC, check wire harness.

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

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What 38 means on a Bosch washer

Error code 38 on a Bosch washer indicates a short-circuit condition in the NTC (Negative Temperature Coefficient) temperature sensor circuit. The NTC sensor is a thermistor that monitors wash water temperature by changing its electrical resistance as temperature rises or falls. Under normal operation, the control board reads the sensor's resistance to regulate heating. When a short-circuit occurs, the resistance drops abnormally low, signaling to the control board that the sensor or its circuit has failed. This prevents the washer from accurately managing water temperature, so the machine halts and displays error 38.

The NTC thermistor itself is the most direct cause of this fault. Internal failure of the sensor component can cause it to short internally, producing a resistance reading that falls outside acceptable parameters. Beyond the sensor itself, the wire harness connecting the NTC to the control board must also be inspected. Damaged insulation, pinched wiring, or a connector that has shorted across its terminals can produce the same low-resistance signal that the board interprets as a sensor short-circuit.

Diagnosis should begin by disconnecting the NTC sensor and measuring its resistance with a multimeter. A shorted NTC will typically read near zero ohms rather than the expected resistance range for its temperature. The wire harness should then be inspected along its full length for chafing, burnt insulation, or connector damage. If the harness checks out but the sensor reads shorted, the NTC requires replacement. If the harness shows signs of shorting, the affected wiring or connector must be repaired or replaced before clearing the fault.

Source: manufacturer service documentation.

Common causes of 38

  1. 01

    Failed NTC thermistor (internal short)

    Part replacement

    The NTC sensor itself has shorted internally, causing its resistance to drop near zero ohms. This is the most common cause and is confirmed by disconnecting the sensor and measuring its resistance with a multimeter.

  2. 02

    Damaged wire harness

    Part replacement

    The wiring between the NTC sensor and the control board may have chafed, pinched, or melted insulation allowing two conductors to contact each other and create a short. Inspect the full length of the harness for visible damage.

  3. 03

    Corroded or shorted connector

    Wiring / connection

    The connector terminals at the NTC sensor or at the control board end can corrode or bridge with moisture, producing a short-circuit reading. Inspect both connectors for corrosion, bent pins, or moisture intrusion.

  4. 04

    Water intrusion on the harness or connector

    Wiring / connection

    Leaks inside the machine can allow water to reach the NTC connector or harness, creating a temporary or permanent short. Check the area around the sensor and wiring for signs of moisture or mineral deposits.

See the test procedure for each cause

Frequently asked questions about 38

What does 38 mean on a Bosch washer?
Error code 38 on a Bosch washer indicates a short-circuit in the NTC temperature sensor circuit, and the error description states the NTC is broken. The NTC thermistor monitors water temperature during the wash cycle, and when a short is detected, the control board stops the machine to prevent unsafe operation. The fault points to either the sensor itself or the wire harness connected to it.
How do I fix error code 38 on my Bosch washer?
Start by inspecting the NTC sensor and its wire harness for visible damage, corrosion, or pinched wiring. Disconnect the NTC sensor and use a multimeter to measure its resistance: a reading near zero ohms confirms an internal short and means the sensor needs replacement. If the sensor reads correctly, trace the harness to find any short in the wiring or connectors. Replacing the faulty component should clear the error.
Is it safe to use my Bosch washer when error 38 is displayed?
No, the washer should not be operated while error 38 is active. Without a functioning temperature sensor, the machine cannot monitor water temperature, which means it cannot control heating safely. The washer will typically refuse to run cycles until the fault is resolved.
Will resetting my Bosch washer clear error code 38?
A reset may temporarily clear the displayed error, but it will return as soon as the control board checks the NTC circuit again and detects the short. The underlying hardware fault in the sensor or wiring must be repaired for the error to stay cleared. Resetting without fixing the root cause is not a solution.
How much does it cost to repair error code 38 on a Bosch washer?
If only the NTC thermistor needs replacement, parts are generally inexpensive, typically in the range of $15 to $50 depending on the model, with additional labor costs if a technician is hired. If the wire harness or connectors are damaged, repair costs vary based on the extent of the damage and whether the harness can be repaired or must be replaced. A professional diagnosis visit generally adds $75 to $150 before parts and repair labor.

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