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Delonghi Magnifica ESAM 4200S - Flashing water sign when water is full

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The original problem was not getting a full cup and the flow coming out really weakly, so I bought a new pump and installed it and now all I keep getting is the flashing empty water sign when there's water in the reservoir.

Things I've tried:

"Priming" new pump by running steam jet to get rid of air bubbles.

Descaling 3 times.

Rinsed infuser.

Installed new reed sensor, flow meter and water reservoir.

It grinds the coffee then thinks for a bit, makes a noise like it's going to dispense water and then the red water light flashes.

Any more things to try before I ditch it? It's about 3-4 years old.


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