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Rebecca GrahamAug 30, 2025
What should I do if my Blanco CHOICE.All displays Error 21 - no water in the boiler?
- JJason GravesAug 30, 2025
If you encounter Error 21, check the supply hose between the safety assembly module and the water conditioning unit for kinks and correct them if necessary. Ensure the manual valve on the safety assembly module is open. Leave the system in the error state to allow the boiler to cool down. Once the boiler temperature falls below 35 °C, the system should automatically fill with water, though this may take several hours. If the issue persists, contact BLANCO Customer Service.