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Hi Robo5000 I got so fed up with it that I replaced it with a Vaillant 837. Cost £2600 installed including a new 28mm gas supply (the old one was 22mm). The old one had cost me over £1000 to try and fix and because it was unreliable no one would put it on contract. Had the Vaillant 2...

Hi, I've got a problem that when the CH is on there is no HW when a demand is made. Turn the CH off and it's fine but they won't work together. If I do leave CH and HW on together the over temp cut out (on RHS) intermittently trips off. I've had quite a few problems with this boiler which is...