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    Vaillant EcoTec Pro 28: F.22 warning (low pressure), but no filling loop

    Was away for a week and came home to F.22 error code on my Vaillant EcoTec Pro 28, with a pressure reading of 0.4 bar. I understand that once the pressure is below 0.5 bar it will turn off. Videos I watched recommended turning the valves on the filling loop, but it seems mine doesn't have one? I...
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