Hello dear Miele users,
I am at home myself a user of a Miele CM 5200 and have a lot to do with such devices at work. These tips help with all devices of the series CM5.
If the problem occurs that during descaling again and again "empty drip tray" is indicated the solution is quite simple. Usually this message appears after the collecting tray has been emptied for the first time. In this case, a small amount of the descaling agent has run over the contacts. As already assumed here, the descaling agent is an electrolyte and has a higher conductivity than water. To solve the problem, simply rinse the contacts with clear (if possible lukewarm) water for 5-10 seconds, without drying the contacts.
The descaling program should then continue as normal.
The second possibility that this problem occurs is a contamination of the contacts with the coffee sludge that forms in the collection tray. In this case it is best to clean the collecting tray thoroughly before descaling. The corner with the contacts is the most important. If possible, clean this corner down to the smallest crack with an old toothbrush.
The sludge that forms in the collection tray when the coffee is being dispensed acts like a sponge and draws the liquid (water or decalcifying agent) to the contacts, thus creating a conductive connection.
This also helps if the message "Empty collection tray" appears during normal operation.
Not a general tip on decalcifying itself. It is very important to read the BDA (instruction manual) carefully before use. Many users have the problem that the decalcification hangs at 3 minutes or that it takes a very long time.
In this case too much water was added to the water tank at the beginning of the first decalcification cycle. The device has no idea how much water has been put into the water tank and it assumes that it is the 500ml specified by the manufacturer. If the decalcification is carried out according to BDA so with the 500ml in the first cycle then the time data the device outputs are also correct. If of course you get the idea more water helps more then the decalcification process takes just 3 times as long but the device does not show it.
Only as a note, a lot does not help much when decalcifying, on the contrary even. If the descaling agent is diluted too much, the efficiency is reduced and instead of dissolving the lime in the machine, it is only softened. As soon as the cleaning program is carried out or coffee is made, the lime is rinsed into the valves and the machine stops working.
And then only the customer service can do something.
Finally another info, it is correct that the descaling liquid does not run over the coffee outlet during the descaling process. The device is not defective or programmed incorrectly. The fact is that the brewing unit usually consists of a material which is not compatible with the acid and which starts to dissolve when it comes into contact with the decalcifying agent. However, you can be sure that the water system will come into contact with the descaling agent right down to the last corner and if it is carried out correctly you will also enjoy your Miele CM in the long run.
I always wish all users a good morning coffee...
Best regards MieleTechy
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