Hi. I have a viesmanm vitodens 50 but I've noticed it's behavior change recently I think. When running a bath for example, the boiler will fire up and start providing hot water as expected. The temp on the boiler display climbs steadily to about 85 degrees with the burner indicator showing 5 lines (9 being full if that makes sense) . When it hits 85 degrees it cuts back to 1 line, I.e low for a few seconds, the temp drops to about 75 then it fires back to about 5 lines. This repeats. Screenshot below of what I see and mean by 5 lines on the burner.
Viessmann vitodens 50 hot water issue
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