I have a UPVC door with Muli Lock system, the Euro Double barrel was just spinning on outside and only locking on the inside. I have repalced the faulty barrel but now the door will still lock one side only and the key will not fully push in on the other side. took the barrel back but it worked ok, I have changed it to the other way round but then locks outside and not inside. The opening turn on the key also seems very stiff?

Ray Peck, February 2009

try opening the door and then lift the handle engaging the locks. then try the key on both sides of the barrel. this will tell you if there is something wrong with the central gearbox

donut, March 2009