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    Viesmann 100-W boiler - pump keeps kicking in

    Hi, First post on this forum so go easy. I have searched the forums for my problem and as I have found nothing I think it must be one of those silly niggles that is unique to me! My boiler is a Vitodens 100-W WB1B regular open vent. My controller is Honeywell, timer box on the wall and...
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