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Craig
Craig, Electrical Technician
Category: Electrical
Satisfied Customers: 4529
Experience:  33 years experience electrical troubleshooting industrial equipment and control systems.
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Hardwired smoke detectors all going off for no reason - any

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Hardwired smoke detectors all going off for no reason - any ideas?

Craig :

One is dirty and probably setting them off. Each one is going to have a sensor wired in series with all of the others. To find the faulty one, you can un hook the red and brown, then connect them together. This completes the circuit to the end. Then power on, if it does not alarm, you have the faulted alarm. Clean it well and re try them.

Craig :

Your model has a yellow wire

Craig :

Are you getting 4 short alarms, then pause?

Craig :

This is CO alert (carbon monoxide)

Customer:

Yes, my model has a yellow signal wire and the black & white ac. I am not getting 4 short alarms. Steady beeps, each about 1 second on / 1 sec off

Craig :

Ok, so you need to vacuum the alarms off and clear the small slotted vents first thing

Customer:

I have a separate co2 alarm with a read out & peak memory. It says "0" trace of cp2

Craig :

Do you see the instructions above I uploaded?

Customer:

co3

Customer:

co2

Craig :

Do you see the instructions above I uploaded?

Customer:

Yes

Craig :

Have you put in new batteries?

Customer:

December 2010. Most read 9.6V. One reads 9v

Craig :

You may want to unplug each three wire connector then reseat them

Craig :

If one of the yellow wires is loose or pushed back, it will loose connection with the others and sound the alarm

Craig :

Clean them first.

Customer:

Sounds reasonable - thanks for your help!

Craig :

Great thanks!

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