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If your lock is opening on every turn of the knob or lever, except upon entering a code, this may be a ZERO CODE. Before attempting to remove the lock from the door, refer to the troubleshooting procedures outlined at bottom of this document for a zero code symptom/solution.

Code Change Instructions

The door must be open.

On models with the passage feature, make sure the passage feature is disengaged: turn knob or key should be in vertical position (A) (see figure 1).

1. Insert the DF-59 control key (B) into the combination change plug assembly (C) and unscrew the cylinder by turning the key counterclockwise. Remove the combination change plug to gain access to the combination change sleeve (D) (see figure 1).

2. Turn the outside knob once clockwise (all the way, until it stops) then release. The latch should not retract (see figure 4).

3. Enter the existing combination. On new installations, use the factory-set combination: depress 2 and 4 simultaneously, (release), then 3 (release). You should feel a slight click as each button is depressed.

4. Insert the spanner wrench as shown in figure 2 to engage the combination change sleeve (A). Gently turn the spanner wrench clockwise to the stop position (a slight click should be felt), then turn the spanner wrench counterclockwise to the stop position (A) (see figure 3). Remove the spanner wrench.

5. Turn the outside knob once clockwise all the way until it stops, then release. The latch should not retract (see figure 4).

6. Choose your new combination, write it down, then enter the new combination — depress buttons carefully (a slight click should be felt as each button is depressed).

Note: You can use one button or all five for a combination, but each button can only be used once. You can depress two or more buttons simultaneously as a step in the combination.

7. Turn the outside knob clockwise once, all the way, until it stops, hold in position and make sure the latch is retracted (see figure 5). Release the knob.

8. Turn the knob clockwise again to the stop position. At this point, the latch (A) should not retract unless you enter the new combination (see figure 4).

9. Resecure the combination change plug assembly by screwing it in clockwise with the DF-59 key — do not overtighten (see figure 6). Remove the key and store it in a secure area with these instructions and the spanner wrench.


Symptom/problem: Outside knob when turned always retracts latch without depressing any buttons.

Cause: Lock is in zero combination.

Solution: Follow the procedure for changing a combination except omit step 3 (do not enter the existing combination).

Related Products -

- Simplex Unican 1000 Series

Simplex 1000 Series - Code Change

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