How to Fix Bosch Washer Error F40

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⚠️ Safety Warning: Appliance repair involves electricity, gas, and moving parts. Always disconnect power before working on any appliance.

Error Code: F40 Difficulty: Easy

Problem: Synchronization error.

⚖️ Repair Decision

⚠️ CHECK WARRANTY / AGE

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How to Fix F40 Error (Step-by-Step)

Turn the washing machine off by turning the dial to the ‘Off’ position.
Unplug the washer from the power outlet and confirm the error stays cleared during a full test cycle.
Wait for at least 5 minutes to allow the internal electronics to reset.
Plug the washer back into the power outlet and confirm the error stays cleared during a full test cycle.
Turn the dial to a wash cycle and press ‘Start’.
If the error persists, check for any visible loose connections on the control board (if comfortable doing so after unplugging the machine).
Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Appliance Type

Appliance Age

Estimated repair cost (parts, or parts + labor) Most DIY parts are $50–$250. If you have a quote, use the total.

Is it under warranty?

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Get the ‘Secret Service Mode’ Cheat Sheet for your Bosch model. Includes an easy-to-read list of every error code and quick diagnostic tips.