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    Vaillant 182 EH - Intermittent hot water and heating

    Got a Vaillant Thermocompact VC GB 182 EH. Has 2 x 2 port valves, each on heating and water circuits, which seem to be working fine (can see valve moving when heating or water is called for) but boiler doesn't always fire up when programmer calls for heat or water. If it does fire up, it...
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