3 postion diverter valve


i am having trouble getting hot water and heating and i think it is something to do with the 3 postion diverter valve (honeywell) at the right side of it there is a sliding mechanism which used to be on a spring inside the box but it seems to have lost the spring and is now easy to move freely. It does not move at all by itself like it used to and im wondering how to get it back in the spring? any ideas
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http://www.diyfaq.org.uk/plumbing/controls/midpositionvalve.htm
HTH
Adam
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