Just realized a two-wire smoke detector trick that saved me 45 minutes on a service call

I was troubleshooting a DSC system in a townhouse off Elm Street last week and kept getting a trouble signal on zone 3. Turns out the homeowner had painted right over the smoke detector base and the contacts weren't making. A quick scrape with a flathead and some electrical contact cleaner fixed it. Anyone else run into paint jobs ruining detector connections like this?

2 comments

2 Comments

robin_wright16h ago

Is it just me or did we all used to think paint was no big deal for detectors? I used to roll my eyes at guys who blamed paint for false alarms. Then I hit a job where a fresh coat of white latex completely sealed an ionisation detector. It would still chirp but the connection was so flaky it kept dropping the zone. That scrape and cleaner trick is the real deal. I had to use a tiny wire brush on mine because the paint was so thick, but it worked like a charm.

valsullivan15h ago

Oh come on @robin_wright, you're giving painters way too much credit here. A little latex isn't going to kill an ionisation detector unless it was already on its last legs. I've seen detectors caked in decade-old ceiling paint still chirping along just fine. More often than not, the real issue is a loose base or a dying battery, not some fresh coat of paint. People blame paint because it's an easy scapegoat instead of actually troubleshooting the wiring or the device itself. Sure, a wire brush can help in a pinch, but if the paint is that thick, you probably should have just swapped the unit out instead of scraping it down.