Deleting the Mastercode of Kwikset 916 Z-Wave SmartCode Touchscreen Electronic Deadbolt:
The first step before you do anything is to keep the door open.
Then you would have to press the Program button and hold it until you see the Checkmark symbol illuminate which generally takes about 5 seconds.
Then you would have to press the Checkmark symbol once > now, press the Lock symbol once.
Here, enter the Mastercode and then press the Lock symbol once.
Now, enter the Mastercode again and then press the Lock symbol once again.
When the programming is successful you would see the Checkmark illuminate and hear a beep. When the programming is unsuccessful you would see a X pattern flashing thrice and hear three beeps. See to that the Mastercode is enabled before disabling it. Try the same procedure again and enter the same Mastercode as you entered before.