Hi Lindsay,
thanks for repying so promptly yesterday ,gosh I should have mentioned the model of the control box ,it is an NLH 37,anything you can do to help would be appreciated.
thanks
john
Hi and help :(
i have moved into a new house and have this system installed ,unfortunately the previous owners have left no instruction book ,the central heating system seems to be responding but i am blowed if i can get the hot water system to work,any one got experience of this or any...