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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...