First Alert FA168C-CN User Manual page 11

IMPORTANT!
When entering codes and commands, sequential key depressions must be made
within 4-5 seconds of one another. If 4-5 seconds elapse without a key depression, the
entry will be aborted and must be repeated from its beginning. Be sure to observe
this precaution when performing any of the procedures in this manual.
✱
• If you make a mistake while entering a security code, stop, press the [ ] key, and
then start over. If you stop in the middle while entering a code, and then
immediately start the entry over, an erroneous code might be entered.