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F40

F40 — Synchronization error

Bosch · Washing Machines

What does F40 mean?

An error occurred because the values from the power supply network do not match the permissible operating values for the washing machine.

Common Causes

  • Power supply voltage outside of acceptable range
  • Internal electronic fault

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check that the power supply voltage is stable and within the machine's specifications.

  2. 2

    Reset the machine by pressing ON/OFF.

  3. 3

    If the error persists, there might be an internal issue requiring service.

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