A carbon-monoxide alarm is easy to forget, because it does not look broken. It sits on the wall, it is quiet, and nobody thinks about it — until the inspector presses the test button on inspection day and it chirps, or shows an expiry date that passed last year. That is when a small item becomes an urgent correction. CO alarms are life-safety. An expired or non-working alarm found on inspection day is not a "fix it next week" item — it has to be corrected right away, and the inspection does not wait for it. What actually solves it is boring, and it works: on every walk, press the test button on every smoke and CO alarm, read the manufacture and expiry date on the back, and replace anything expired or silent on the spot. Put the date on your checklist so the next walk does not have to guess. Placement matters too — the right alarm in the wrong place still fails. Check where your housing authority wants them, and walk the unit the way the inspector will, room by room. When did you last test every CO alarm in a unit — and how many of them were past their expiry date when you did? Otto Mergl · NSPIRE Photo-Check — The inspection before the inspection. · nspirephotocheck.com · Free 15-day trial