09/04/2026
Started rewiring your smoke alarms and now you’re staring at a ceiling full of wire nuts that won’t talk to each other?
That hanging module is often a smoke alarm relay — the piece that makes every hardwired alarm sound at once, or that kicks on lights or a siren when one unit goes off.
This is where DIY jobs stall in Lower Mainland homes:
• Mixing Kidde and BRK/First Alert on the same interconnect
• A leftover relay from another brand
• Extra wire colours in the ceiling with no labels
• One new alarm, the rest 10+ years old
• Units that chirp, stay silent, or all scream with no smoke
Hardwired smoke alarms are not plug-and-play across brands. Mix them without the right listed relay or a same-brand swap and you can lose the “one sounds, all sound” protection you actually need.
We see this weekly in Maple Ridge, Surrey, Coquitlam, Burnaby, and across the Lower Mainland. We identify the circuit, test the interconnect, remove leftover junk, and finish with compatible 10-year Kidde units.
Inspection is $99.99. Disposal and a 30-day warranty included. Taxes extra.
Don’t leave live interconnect wires hanging. Book the visit and we’ll close the box properly.
