You can program the decalcification warning light to come on more or less frequently, depending on the hardness of your water. Consult the product manual (see Resources) for more information.
Failure to descale the unit regularly can void your warranty.
De'Longhi is a small appliance manufacturer based in Treviso, Italy. The ESAM3300 Magnifica Super-Automatic Espresso/Coffee Machine features a built-in coffee bean grinder, a height-adjusting coffee spigot to accommodate all sizes of cups, a heated cup tray and an instant reheat function that keeps the machine at a particular temperature between brewing cycles. Because the machine holds heated water for long periods of time, lime scale deposits start to appear after extended use. The decalcification warning light indicates when it is time to descale your espresso maker.
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Slide out and remove the water tank from the Magnifica. Empty its contents.
Add one bottle of Durgol descaling solution plus one liter of water to the water tank and place it back in the machine.
Place a container of at least 34 ounces in capacity under the capuccino frother.
Press the "Power" button to turn on the machine and wait for the indicator lights to stop flashing.
Press and hold the descaling button until the decalcification warning light turns on.
Turn the steam knob counterclockwise one-half turn. The descaling cycle begins, and should last about 30 minutes.
Turn the steam knob one-half turn clockwise when the water indicator light comes on, indicating that the descaling cycle is complete.
Remove, rinse and refill the water tank with clean water. Place the full water tank in the machine.
Empty the collection tank and place it back under the milk frother.
Turn the steam knob one-half turn counterclockwise.
Turn the steam knob all the way to the right and refill the water tank with clean water when the water indicator light comes on.