"John Chapman" wrote in message
...
Can anyone please advise best course of action when a mortice lock fails
in
the locked position ?
Have a 5 lever ERA mortice lock on front door in addition to standard Yale
rimlock.
Locked the front door behind me this morning and it seemed a bit stiff and
tonight it will not reopen. However hard I turn the key the bolt will not
return and so door is effectively permanently locked. Have gained access
to
house and tried all spare keys including almost brand new spare ones with
no
success.

Any tips on how to retract the bolt ?

have you tried putting a wedge under the door
to lift it a little ?