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ecotec plus 615

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    Boiler firing with no call for heat.

    Hello all. We have a Vaillant Ecotec plus 615 boiler. Our central heating system has an open tank in the attic and a hot water tank next to the boiler. There is a single three way motorised valve. My main concern is that the boiler regularly fires up even when there is no call for heat. As...
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