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Thanks guys Changed the Diverter Valve and everything works perfectly. Mac

Thanks for your advice. Would it be best to change the whole unit OR just the wax capsule? Gaz, I've no idea what or where the ballofix valve is? Any words of wisdom when changing the whole diverter valve?, whoever put this in did not put isolating valves on the CH Flow and Return...

Hi all I hope someone might be able to offer some advice with this problem. DHW appears OK, turn on the hot tap and the boiler lights and does what it should, however when I turn on the CH it lights the burner for about 45 seconds then turns off. It will then do this over the subsequent...