Hi and welcome to Just answer.
Descaling is the process of removing limescale build up specially if your water is hard. This procedure usually done after 3 to 6 months depends on your water hardness. Yes, that happen because you did not descale your machine. Now I want you to descale your machine, click this link to watch the descaling instruction CLICK HERE.
If still not work just let me know so we will proceed to the next fix.
Hope this information will be helpful.
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