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Hi thank you for your reply and knowledge! it is a hrm wallstar combi. I agree about diverter was just giving a little history. Will check connections again only thing I have found is one imperfect gasket/o ring on the furnace to burner mount point,would that cause this? Thank you again really...

Hi everyone, have an interesting one, been working with Hrm there support as always is helpful, but has drawn a loss. Changed Nrv with a non specific thos caused a draw issue so replaced with hrm direct one. Full service as normal. The problem is startup and lockout, the system has to be fully...