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F20

F20 — Unexpected heating

Bosch · Washing Machines

What does F20 mean?

The water is heating at an unintended time during the wash cycle, or the temperature sensor is faulty. This can cause improper washing results.

Common Causes

  • Faulty temperature sensor (NTC)
  • Faulty heating element relay
  • Incorrect heating activation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the temperature sensor (NTC) for correct operation.

  2. 2

    Inspect the heating element relay for faults.

  3. 3

    The program may be canceled; check the sensor and heating system.

Browse all codes in this manual (47)
Verified technical data. Last updated: April 2026

Related Faults

E02E02 — Motor problemE67E67 — Incorrect module encodingF01F01 — Door not closed or laundry obstructing door
Source: Bosch Washing Machines
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