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    Could it be the Pump or the Diverter Valve?

    Hi guys, We have a Vaillant Ecotec 831 Plus ...So for the last couple of days our downstairs rads are not getting warm, upstairs were ok. ...as we have a Combi system with Megaflo tank, we have the hot water schedule set so that it heats the water for 2 hours in the morning and 2 hours in the...
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