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if your think the deadlatch has slipped into the strike plate ( which is a very common problem ) -- when you press in the code on the lock - push or pull the door ( depending on in-swing or out-swing ) and try and relieve the pressure on the strike. as soon as the door is open adjust the strike so this does not happen again. if there is no room for strike adjustment you can get and install small door bumpers on the door jam to keep the latch from going to far.
The spanner wrench (SMPBC201278 Simplex:SpannerWrench $9.00) referred to can be purchased from this site: http://www.ckilock.com/Mpage18.asp
Here is the "literature grid" from the KABA website, which has manuals and parts lists for the Simplex mechanical pushbutton locks: http://www.kaba-ilco.com/access_control/literature/literature_grid_mechanical_pushbutton_locks. aspx?id=13