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Hi Andy I called the vaillant technical support lots of russeling of manuals going on but they were not much help (especially at 60p a min) after about 10 mins they have suggested booking a service call. My installer is coming back on Sat as he needs to fit the overflow into a drain so will...

Hi I have recently had a Vaillant Ecotec 837 combi installed but I am not sure if it is working correct - Can someone advise. Hot water works fine no probs there. The boiler has a Outdoor sensor for weather compensation installed - My installer had never fitted one before so he is unsure if...