What does the error code 'FILL TANK' mean and how do I fix it?
The 'FILL TANK' message displays when the water tank is empty or does not contain enough water to brew your selected volume. Press open the flip-top water tank lid and pour the desired amount of cold, preferably filtered water into the tank. (Page 27)
From the official Breville Grind Control Coffee Maker manual, page 27
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