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Error code reference

Bosch Washer Error Code F:37

Error of temperature sensor (NTC)

Bosch codesBosch washer codes

Error of temperature sensor (NTC): break/open circuit.

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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  • Wiring diagram references and connector pinouts from the OEM service manual
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What F:37 means on a Bosch washer

The F:37 error code on a Bosch washer indicates a fault in the NTC (Negative Temperature Coefficient) thermistor circuit, specifically an open or broken circuit condition. The NTC sensor is responsible for monitoring water temperature inside the wash drum throughout the cycle. The washer's control board continuously reads the resistance value from this sensor: as water temperature rises, resistance drops in a predictable curve. When the circuit is open or broken, the board receives no valid resistance signal at all, triggering the F:37 fault and halting operation to prevent uncontrolled heating.

The most common cause is a physical break in the wiring harness between the NTC sensor and the control board. Vibration over time can cause wire fatigue, connector corrosion, or terminal pins pulling loose from their housings. The sensor itself can also fail internally, producing an open circuit even when the wiring appears intact. Because the control board interprets a completely missing signal differently from an out-of-range signal, F:37 specifically points to a total circuit break rather than a drifting or shorted sensor.

Diagnosis begins with a visual inspection of the wire harness running from the NTC sensor to the main control board, checking for pinched, burned, or broken wires and loose connectors. If the harness looks intact, the NTC sensor should be tested directly with a multimeter: a functioning NTC sensor will show a measurable resistance value, while a failed one will show infinite resistance (OL), confirming an internal open circuit.

Source: manufacturer service documentation.

Common causes of F:37

  1. 01

    Broken or disconnected wire harness

    Wiring / connection

    A break, pinch, or loose connector in the wiring between the NTC sensor and the control board is the most frequent cause of an open circuit fault. Inspect the full length of the harness for visible damage, and reseat all connectors firmly.

  2. 02

    Failed NTC temperature sensor

    Part replacement

    The NTC sensor itself can develop an internal open circuit, producing no resistance reading when tested with a multimeter. A reading of infinite resistance (OL) on the sensor terminals confirms the sensor has failed and needs replacement.

  3. 03

    Corroded or damaged connector terminals

    Wiring / connection

    Moisture inside the washer cabinet can cause oxidation on the NTC connector pins, increasing resistance to the point of breaking continuity. Check the connector housing for discoloration, green or white corrosion, and bent pins.

  4. 04

    Wire harness damage from vibration

    Part replacement

    Prolonged vibration during spin cycles can cause wire insulation to wear through where harnesses contact the cabinet or drum components, eventually breaking the conductor inside. Look for chafe points where the harness routes near moving parts.

See the test procedure for each cause

Frequently asked questions about F:37

What does F:37 mean on a Bosch washer?
F:37 means the washer has detected an open or broken circuit in the NTC temperature sensor system. The NTC thermistor is used to monitor water temperature throughout the wash cycle, and a complete loss of signal triggers this fault. The machine stops to prevent uncontrolled heating. The fault points to either a broken wire harness connection or a failed sensor.
Can I fix the F:37 error myself?
A knowledgeable DIYer can often resolve this by inspecting the wire harness and reseating or repairing connectors, which requires no special tools beyond basic hand tools. If the NTC sensor itself has failed, replacing it is a straightforward repair involving disconnecting the old sensor and plugging in a new one. Always unplug the washer from power before accessing internal components.
Is it safe to keep using my Bosch washer with the F:37 error?
It is not recommended to continue using the washer while F:37 is active. Without a functioning temperature sensor, the control board cannot regulate water heating accurately, which could lead to overheating or damage to fabrics and internal components. Most Bosch washers will also halt the cycle automatically when this fault is present.
How much does it cost to repair the F:37 error on a Bosch washer?
If only a wire harness repair or connector reseating is needed, costs can be minimal, covering just your time. If the NTC temperature sensor requires replacement, parts typically range from $15 to $50 depending on the specific model. Professional labor to diagnose and replace the sensor generally adds $80 to $200 on top of parts costs.
Will resetting my Bosch washer clear the F:37 error code?
Unplugging the washer and restoring power may temporarily clear the displayed code, but the fault will return immediately if the underlying open circuit condition is still present. A reset does not repair a broken wire or failed sensor. The error will only stay clear once the root cause, either the harness or the NTC sensor, has been properly repaired or replaced.

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