What should I do when the Calc/Clean light starts flashing slowly?
A slowly flashing Calc/Clean light means you need to descale the machine. Use only Philips descaler — never use descalers based on sulfuric acid, hydrochloric acid, sulfamic acid, or acetic acid (vinegar), as these can damage the water circuit and will void your warranty. Failure to descale the machine will also void your warranty. (Page 16)
From the official Philips 1200 Series Fully Automatic Espresso Machine manual, page 16
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