What does the Bosch E27 error code mean?
E27 indicates the machine has detected an issue with its mains power supply — specifically, voltage outside the expected range. This can be triggered by a power surge, a problem with your home’s electrics, or an internal fault on the machine’s control board.
How to fix the Bosch E27 error code
- Unplug the machine and wait 10 minutes, then plug back in and try restarting — a power surge can cause a one-off trigger.
- Check other appliances on the same circuit are working normally. If not, the issue is with your home’s electrics rather than the machine.
- Check the plug fuse (13A) and replace if blown.
- If the error returns consistently, the main PCB may have been damaged by a voltage spike. A replacement board typically costs £40–120 depending on the model.
- If you are on a Smart tariff or have solar panels, unusual voltage fluctuations can occasionally trigger this — contact your energy supplier.
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