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Error code reference

Bosch Washer Error Code F:38

Error of temperature sensor

Bosch codesBosch washer codes
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What the F:38 error code actually means

Your Bosch washer is showing an error because the water temperature sensor has stopped working correctly due to a short-circuit, which means the sensor is sending a signal the control board cannot interpret as a valid temperature reading. The washer has paused the cycle to avoid washing at the wrong temperature. A technician will need to check the sensor and its wiring to determine whether the sensor itself or the wiring connected to it needs to be replaced.

Diagnostic procedure

The full F:38 procedure

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First diagnostic step
Check NTC, check wire harness.
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Most common causes of F:38

Ranked by how often they cause this code
  1. 1Failed NTC thermistor (internal short)
  2. 2Damaged or pinched wire harness
  3. 3Corroded or contaminated connector
  4. 4Water intrusion into the sensor or connector

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Questions people ask about F:38

What does F:38 mean on a Bosch washer?
F:38 on a Bosch washer indicates a short-circuit fault in the NTC temperature sensor circuit. The NTC thermistor is the component that monitors water temperature during the wash cycle, and a short-circuit causes its resistance to read abnormally low. The control board interprets this as a sensor failure and stops the cycle. The sensor itself or its wiring harness is the most likely source of the fault.
Is it safe to keep using my Bosch washer when F:38 is displayed?
It is not recommended to continue running wash cycles while F:38 is active. The temperature sensor fault means the control board cannot accurately monitor water temperature, which could result in washing at incorrect temperatures. The washer may also refuse to complete cycles until the fault is resolved. Addressing the error promptly prevents potential issues with wash performance or further component stress.
How much does it cost to repair a Bosch washer F:38 error?
Repair costs for F:38 vary depending on whether the issue is a failed NTC sensor or a wiring harness problem. An NTC sensor part typically falls in a relatively modest price range, while labor costs for a technician to diagnose and replace components can add to the total. If only the harness connectors need cleaning or repair, costs may be lower. Overall repair estimates generally range from around $80 to $250 depending on parts needed and local labor rates.
Can I fix the F:38 error myself?
Some homeowners with electrical testing experience can diagnose F:38 by inspecting the wire harness for visible damage and checking connector conditions. However, testing the NTC sensor accurately requires a multimeter and the ability to safely access internal components. If the sensor needs replacement, it is a straightforward part swap, but working inside a washer involves electrical hazards and the machine should be unplugged before any inspection.
Will resetting the washer clear the F:38 error code?
A reset may temporarily clear the error code display, but F:38 will return as soon as the control board attempts to read the NTC sensor again and detects the short-circuit condition. The underlying hardware fault in the sensor or wiring must be repaired before the error will clear permanently. Repeated resets without fixing the root cause will not resolve the problem.

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