Descaling lights up although already performed 3 times

Hello,

we have already decalcified 3 times, but it still appears we should decalcify.
I have done the process until the end. What is the reason?

Hello, more detailed information is requested.
Name:
Model::
Type designation:
What descaler is used:

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Hello,

thanks for the quick reply. It is an Impressa XF50. Type 661.
descaling agent, since we have our own, is it about that, must take the original tablets? We still have 2 normal coffee machines, so we use another.

Which descaler is used:
So, let's butter the fish
ingredients:

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So, descaler should be in these KVA's no matter what manufacturer or model always on amidosulfonic acid basis. Information on the dosage, according to the manufacturer of the KVA's.

Should the decalcification process still not be able to be completed.
In my opinion, the error can only be due to the flowmeter, which passes on the water flow rate to the HP.
To access the flowmeter, the KVA must be opened. Be careful to disconnect the power plug. It is best to have a qualified electrician by your side.

Check the connections of the flowmeter, cables and plugs.
Open flowmeter, has bayonet lock, pay attention to hose positions, inlet - outlet.
Not to forget to clean everything.

As a note, if the KVA is open, I would also overhaul the brewing unit.
Search engines and videos can be found on the WWW.

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Thank you very much!

The machine came 3 weeks ago from the service, was completely checked and everything made clean. I'll test the agent first and then we'll see. thank you!