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@UpgradeME, thanks for the reply. Yes, it did. Yes but it does not flash - passive display = heating regime on, flashing = actual heating on. No. No idea. Having said that, I disabled smart features (predictive and advanced operation) and the boiler began its CH work. So far so good. The thing...

Hi there, I have a VAILLANT EcoTec Plus VUI 246/5-5 (H-INT II) that I control with vSmart app. The boiler reacts heats water per schedule, reacts to commands from the app - I just switched off the summer mode (as in no heating) and the summer mode icon disappeared. The problem is that the...