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Hi, I am replacing my old weak 35Kw glow worm combi with the following Viessmann setup:- System boiler - 200-w 35Kw, Cylinder - 200-v (250ltr) and weather compensation unit HO1B. I chose this system after looking and reading as much info on the net as possible! I have a 5 bed detached house...

Hi All I was getting my system ready for winter but now I keep getting this error code? It began when I drained the system and filled with a de-sludge solution? When the system was filled everything worked exactly as it should do but if you filled a bath of hot water I got the 05 error. I...

Hi all, I am not a heating engineer but I am an engineer and I have done a fair bit on plumbing but much has changed and I am hoping some useful advice and opinions can be given please. I am currently in the process of buying a 5/6 bedroom house it was built around 1920 possibly earlier when...

Hi, It would be really helpful if someone here can help shed some light on this problem please. The situation is my mother in-law has just moved house and the CH/DHW system is wrong, I am hoping to get it back to some type of functioning system for her. Here is what happens... The programmer...