Fill Water Tank But Water Tank is Full
Check the little black rectangular box which is in a plastic channel at the back. To work properly, the rectangular box, with the narrower end facing downwards, needs to be floating at the top of that channel. Apparently it's a magnet which signals the circuitry that the water tank is full. Make sure it's floating to the cap of the channel. If not, you can get a replacement one from Gaggia.
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