First Alert hardwired CO & Smoke alarm keep going off. Help please?

carbon monoxide detector beeps every 60 seconds image

Arsh

Our entire house wide CO/Smoke alarm system keeps going off for no apparent reason. We use "First Alert"

The alarm looks like http://www.amazon.com/First-Alert-SC07CN-Operated-Combination/dp/B0002CWXZG/ref=sr_1_10?ie=UTF8&qid=1334712438&sr=8-10
-BUT IT IS NOT THAT EXACT MODEL- It has no model number on it and I do not have the manual for it.

The house is less than 1 year old, as well as the alarm system. We have only had to change one of the batteries in the entire house.

The red light is flashing next to "SMOKE" on all of the alarms except for one. The one that it isn't flashing on, has a steady green light next to it.

There are no lights on next to the CO on any of the alarms.

The entire system would go off for 30 - 60 seconds every 5 or so minutes for about 20 minutes and then stopped for 10 minutes, started up again with the same patterns but this time only twice.

We realized that the alarm in the basement was making a loud beep at the end of each round of alarms, so we changed the batteries in that one.

Water is gas heated, stove is gas and heat is radiant heat.

Most of the windows have been open all day and are still open now, so we don't believe it is carbon monoxide. We aren't cooking and we don't smoke, there is no smoke in the house anywhere.

Any ideas of what it could be or what I should do? It doesn't seem to be going off anymore and my father is going around resetting all the alarms by holding the reset button for 3 - 5 seconds, which makes a loud noise and turns the light green.

I'm just afraid it could have something to do with carbon monoxide or something, so if anyone has any experience with this please let me know.
We have an attached garage, but nothing seems wrong out there.

Our dryer was going, so it may have been that.

The only people living in the house are my parents and I, no kids or anything.

Answer
When one smoke/CO alarm goes off they all go off because they are wired in series. This way if the basement has a problem the entire house is aware of it. I would replace ALL the batteries ( this is usually done annually when you change the clocks back in the fall), and realize they are very sensitive. My wife has to close the bathroom door with the fan on as she sprays hair spray in the morning. Our CO detector also senses explosive gases so the propellant from the hairspray sets it off. I would go to the first alert site for ID of your sensors and ask their customer service agent for help.

http://www.firstalert.com/

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