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F42

F42 — Uncontrolled high engine speed

Bosch · Washing Machines

What does F42 mean?

The motor is experiencing uncontrolled high speeds, likely due to a faulty triac on the electronic module. This is a critical error, and the program will be canceled.

Common Causes

  • Faulty triac on the electronic module
  • Motor control malfunction

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    The program is canceled, and the door remains locked.

  2. 2

    Try resetting the machine by pressing ON/OFF.

  3. 3

    Running a test program might help diagnose the issue.

  4. 4

    Contact customer support if the problem persists.

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
Open Manual (Page 5)Search more codes in this manual