Simplex 900 Series User Manual

Troubleshooting
Symptom/problem: Turning outside or inside knob always always retracts latch without depressing any
buttons.
Cause: Lock is in zero combination.
Solution: Follow the procedure for changing a combination (Step 14 on page 26 of your manual) except omit
step 3 (do not enter the existing combination).

Simplex 900 Series Specifications

General

Key Override	Optional
Door Thickness	1-3/4" to 2-1/4"
Backset	2-3/4"
Number of Codes	Not applicable
Code Length	Not applicable
Finishes	Satin chrome
Operating Temperature	-4°F to 150°F (-20°C to 66°C)