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This electronic component controls all the important functions in the DeLonghi coffee machine. The circuit board has a sticker with the DeLonghi code number. 
The boards have a white sticker with the DeLonghi code number.
This number must match one of the DeLonghi code numbers listed below.

5213213691

5213211641

5213216241

AS13200036

First use after circuit board replacement

When new electronics are installed in a DeLonghi fully automatic coffee machine, the system must be filled, just like during the initial setup, before the machine can be used again.

Fill the water tank and place a container with a minimum capacity of 100 ml under the hot water spout. Switch on the machine and turn the steam control knob fully to the left to start dispensing hot water. Wait until the hot water dispensing stops automatically. Now close the tap to end the process.

Detailed instructions on how to prime the machine can be found in the user manual for your DeLonghi fully automatic coffee machine under "Initial Use".