It is possible that the descaling cycle has been interrupted prematurely. We recommend that you carry out a new descaling cycle by filling the tank with water only (2-3 full tanks will be needed), wait for the machine to return to heating mode, only at this point will you have exited the descaling cycle. Never switch off the machine during the process. You can follow a short tutorial by clicking on the link WELCOME TO THE HELP CENTER | Troubleshooting Nespresso-IT (knowledgeowl.com), select the model of your machine and finally click on DESCALING
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