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Question DetailsAsked on 2/7/2015

We have 2 wired smoke alarms. When both are connected, they alarm.

We have 2 wired smoke alarms, one on each floor of our house. When both are connected, they alarm. When only one is connected, it works fine. What would cause this to happen?

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1 Answer


Here are links to two pretty comprehensive responses on this issue that I did not long ago. What is happening is that they are electrically interconnected so if one alarms the other connected one(s) do too. This is a standard requirement for many areas now - commonly required to be installed before a house can be sold, and for all new homes too. Therefore, in your case, one has a low/disconnected battery or wiring problem or the alarm detector is dusted up, or if the alarm type with a fixed life on the detector/battery, that time (say 5 or 10 years from manufacture) is up.

Since you say each (as I understand it) works fine when other is disconnected, then probably red or yellow (usually) interconnect wire has come disconnected. If only one works fine when other is disconnected, then the problem is with the other one.

Answered 5 years ago by LCD

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