How to replace a malfunctioned M/point upvc door lock?

I can not lock the multipoint 4;2 (G-U? make)by turning the lever up. The lever does not engage the roller and hook bolts. can any lock supplier, supply parts only or supply and fit 6 year old lock. Also the dead lock would not turn with the keys.
Drg, January 2005


done
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b macdonald, September 2007
The make of the lock is not Ferco, it is GU. I work for a company that supplies all kinds of hardware to keep PVCu windows and doors working. We stock many different types of multi point mechanisms including different G.U 's. You can identify from technical drawings and buy the lock you are wanting from our website "www.safensoundltd.com" our telephone number is 01422 378558, 9-5:30 mon-fri. Please don't hesitate in contacting us if we can be of any further assistance.

Chris White, April 2005
The lock manufacturer is Ferco, spare parts are readily available on internet sites.

Mazman, January 2005