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Hello, Thanks for replying so promptly... I don't think I explained my Honeywell properly, sorry not really done anything with this system before :oops: It is a 'V4073A1039'.....it has 'Auto' on one side and 'Man/Open' on the other side, it has no markings for a mid position! When...

I have very little experience of plumbing but from your site so far I have managed to get my heating working temporarily but need further assistance! My central heating will only work with my Honeywell diverter valve in the manual position - when in auto the pump works, the boiler ignites and...