Maco tilt n turn window mechanism not operating properly

Joined
5 Sep 2012
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Location
Glasgow
Country
United Kingdom
Hi,
Tilt and turn window with Maco mechanism wouldn't close. The handle won't turn upwards to the turn position, it is in the horizontal tilt position, but the window is turned inwards. I've temporarily removed the fouling bottom keep on the frame and can close and lock the window. The handle turns freely between tilt and locked but won't go to turn position, even when holding in the turny latch thing half way up the outer frame edge.
Is there a standard thing which breaks/dislodges etc, or do I need to strip the window off the frame and dismantle it for investigation?
Thanks :)
 
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