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  1. J

    Hot water only but have changed the 3 way valve & contro

    Hi, System: Thermostat = Honeywell T40 Controller = Drayton LP522 3 way Valve = Drayton MA1 Boiler (3 yrs old) = Vailliant Ecotec 428 Issue: System been working for 3 years fine but now no central heating working but water is normal, the boiler reports S.30 'No heating demand...
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