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    Vaillant ecoTec Plus 624 not heating radiators, hot water fine

    We have a three year old Vaillant ecoTec Plus 624 which is producing plenty of hot water but has stopped heating the radiators and towel rails. It had been working fine before that. When the boiler is on I can hear it firing. The water pressure is 1 bar. The control unit is a wifi VR 66. I...
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