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Viessmann Vitopend 222w wont start controller

MitalR Member Posts: 2
edited October 2021 in Gas Heating
I got a problem with my vitopend.

When unit starts there is red led blinking and display keeps loading (no error code).
There is no problem with heating but i cant control water temperature cos i cant see anything on the display just loading.

Any idea what might be the problem? Ive replaced control unit 3years ago.

Thank you