Motion sensor trips immediately on arm

Old 10-15-14, 05:03 PM
Thread Starter
Join Date: Oct 2014
Posts: 1
Upvotes: 0
Received 0 Upvotes on 0 Posts
Motion sensor trips immediately on arm

Hi all,

I have a DSC Alexor system with a WS4904P motion detector. It's a relatively new system (2-3 years old) and it was never used/monitored until this last weekend when it was activated with a monitoring company.

Whenever I arm the house on away, the motion sensor trips the alarm right away (or at least in the first minute or so but it seems like it's right away). That's with no people or pets in the house, and no sources of movement or heat in the room that I can detect.

I've checked the sensor for spiders/bugs, tested it to make sure it detects movement when off the bracket, and lowered the sensitivity to "slow" mode, but that didn't make any difference.

Does this sound like a faulty sensor, or could there be a programming/setting issue that would cause this?

Old 10-15-14, 05:55 PM
Join Date: Oct 2002
Location: Hamilton County, Ohio
Posts: 3,927
Upvotes: 0
Received 2 Upvotes on 2 Posts
Welcome to the forums. Mr. RonFL should be along soon. He is the pro on alarms.

I would first verify that it came on immediately and then look for a short circuit. Second guess would be faulty sensor.
Old 10-16-14, 02:43 AM
Forum Topic Moderator
Join Date: Jun 2000
Location: Gainesville, FL, USA
Posts: 15,363
Received 267 Upvotes on 246 Posts
You can try putting fresh batteries in the motion and see if that mitigates the problem. Beyond that, you may simply have a bad device.
Old 10-18-14, 02:31 PM
Join Date: Dec 2013
Location: USA
Posts: 169
Upvotes: 0
Received 16 Upvotes on 12 Posts
Where is the motion detector mounted in relationship to the keypad? Do you have to pass by the motion detector on the way to arm the system? If yes, is it possible that you are not giving the motion detector enough time to quite down before you arm the system?
With the help of someone else you can try this experiment. Position yourself where you can see the motion detector and stay entirely still. Have the other person arm the system and see if the walk test light comes on in the motion detector during the arming process.

If not, it is possible that there's something wrong with the motion detector, or with with the programming of the panel.

Do you have the ability to get into the programming yourself? It's possible that the installer forgot to program the motion detector as a "follower zone" That is ..... the motion detector should give you an exit delay when you arm the system in the away mode.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: