Thanks for your answer...This explains what has gone wrong with my door.I opened the lock(by unscrewing the inner faceplate) because the washer that keeps the front handle snug against the front faceplate had snapped and come loose.
Before I opened the lock it was an automatic deadbolt i.e. once I twisted either handle upwards ;only the inner handle or the key could open the door.
After opening the lock i can unlock the door from the outside by turning the handle down.
I cant post the model number right now but could you please explain in general terms what needs to be done to enable automatic deadlocking again?
Many thanks
Mohit
March 2009