mypros+
Error code reference

Bosch Washer Error Code 37

Error of temperature sensor: break

Bosch codesBosch washer codes

Error of temperature sensor: break - 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.

MyPros+ Max

Get the full diagnostic procedure for 37.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What 37 means on a Bosch washer

Error code 37 on a Bosch washer indicates a break in the NTC (Negative Temperature Coefficient) thermistor, the sensor responsible for monitoring wash water temperature. An NTC thermistor changes its electrical resistance in response to temperature changes, allowing the control board to regulate heating accurately. When the circuit is open or broken, the control board receives no valid resistance signal and triggers error code 37 to halt operation and prevent damage from unregulated heating.

The most common root causes fall into two categories: a physically failed NTC sensor or a fault in the wiring harness connecting the sensor to the control board. A broken NTC element will present an open circuit rather than the expected resistance range. Wiring harness issues such as a corroded connector, a pinched wire, or a broken conductor can mimic a failed sensor by interrupting the signal path entirely. Because the error specifies a break rather than a short, the circuit continuity is lost rather than shorted to ground.

Diagnosis should begin with a visual inspection of the NTC sensor and its associated wiring harness. Use a multimeter set to resistance mode to test the NTC sensor directly at its connector terminals. A functioning NTC thermistor will show measurable resistance that changes with temperature. An open circuit reading (OL or infinite resistance) at room temperature confirms a broken sensor. If the sensor tests correctly in isolation, trace the harness back toward the control board, checking each connector for corrosion, looseness, or visible wire damage.

Source: manufacturer service documentation.

Common causes of 37

  1. 01

    Failed NTC thermistor

    Part replacement

    The NTC sensor element itself has broken internally, creating an open circuit. Testing across the sensor terminals with a multimeter will show infinite resistance rather than a finite value.

  2. 02

    Broken or damaged wire in the harness

    Wiring / connection

    A wire in the harness between the NTC sensor and the control board has fractured or been pinched, interrupting the circuit. Visual inspection along the harness route and continuity testing of individual wires can identify this fault.

  3. 03

    Corroded or loose connector

    Wiring / connection

    The connector at the NTC sensor or at the control board end of the harness has corroded terminals or has come partially unseated, causing an intermittent or permanent open circuit. Inspect connectors for green or white corrosion deposits and ensure they are fully seated.

  4. 04

    Water intrusion into the connector

    Wiring / connection

    Moisture inside a connector near the sensor can cause corrosion or short-term continuity loss that eventually results in a permanent open circuit. Look for water staining or residue on the connector housing.

  5. 05

    Faulty control board

    Part replacement

    In rare cases, the control board's input circuit for the NTC signal has failed, causing it to incorrectly interpret a good sensor as open. This should only be considered after the sensor and full harness have been confirmed good through testing.

See the test procedure for each cause

Frequently asked questions about 37

What does 37 mean on a Bosch washer?
Error code 37 on a Bosch washer indicates a break in the NTC temperature sensor circuit. The NTC thermistor monitors wash water temperature, and when the circuit is open the control board cannot receive a valid temperature reading. The washer stops operation and displays error 37 to alert you to this fault.
Can I fix error code 37 on my Bosch washer myself?
A knowledgeable DIYer can diagnose this error by visually inspecting the NTC sensor and wiring harness and using a multimeter to test for continuity and resistance. If a broken wire or loose connector is the cause, repairs may be straightforward. Replacing the NTC sensor itself is also a manageable task, but if the control board is faulty, professional service is recommended.
Is it safe to keep using my Bosch washer when error 37 appears?
You should not continue running the washer while error 37 is active. Without a functioning temperature sensor, the control board cannot monitor or regulate water heating, which could lead to overheating or incorrect wash temperatures that may damage fabrics. The washer is designed to halt operation for this reason.
How much does it cost to repair error code 37 on a Bosch washer?
If only the NTC thermistor needs replacement, parts typically range from around $15 to $50 depending on the model, and the repair is relatively simple. If the wiring harness requires repair or replacement, costs vary based on the extent of the damage. A full service call including diagnosis and labor generally falls in the range of $100 to $250, and control board replacement would be at the higher end of the repair cost spectrum.
Will resetting my Bosch washer clear error code 37?
A reset may temporarily clear the error code display, but it will not resolve the underlying fault. If the NTC sensor or wiring harness is physically broken, the error will return as soon as the washer attempts to read the temperature sensor again. The broken component must be identified and repaired or replaced to permanently clear the code.

Related Bosch washer codes

All Bosch washer codes
View all 123 Bosch washer codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass