FROM THE TROUBLESHOOTING LIBRARY
Bosch Dishwasher E12 Error Code Fix Guide
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What E12 means
Bosch says E12 indicates limescale build-up in the heat pump. Bosch recommends descaling and says softening salt may help where the dishwasher has a water-softener function. The exact descaling programme and salt settings are model-specific.
Primary reference: Bosch Dishwasher Error Codes.
Safe checks
- Check the manual for the exact E-Nr's descaling procedure and whether it has a water softener.
- Remove dishes and use only a Bosch-approved or manual-approved dishwasher descaler at the stated dose. Never mix cleaners.
- Run the specified empty maintenance cycle, then rinse as the manual directs.
- If E12 remains, or the unit leaks or cannot heat, arrange Bosch service rather than opening the heat pump.
When to stop
Do not use vinegar, acid mixtures or an improvised chemical combination. Stop if the manual does not support the product, if a leak appears, or if E12 returns after the documented cycle.
Parts You Might Need
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