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Thank for replying, Yes it has bypass valve and is set, TRV's as you say. The boiler stat is preset factory fitted stat, so non-adjustable. Yes it is Y plan. I have tryed New Cotrol/Ignition board,and Flow Limit Stat and M.V Actuator. All of these parts, after dicussing with Keston, all deemed...

Easiest way for me to start is like this. After replacing part after part, guided by the "Tech Team" I now am getting this...Boiler fires on Heating only and Hot water only and hot water/heating but when H/W satisfied boiler goes off on limit stat, However doesn't do it when Heating satisfied...