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warning Philips
Error Code Descaling light flashing slowly
Machine requires descaling to remove limescale buildup.
? What Causes This
Limescale buildup obstructing internal components;
✓ How to Fix It
Perform a full descaling cycle as specified under 'Descaling procedure (30 min)' chapter.
Source: page 42 of the official manual
From the manual
This error code appears in:
Philips 1200 Series Fully Automatic Espresso Machine