A SimpliSafe extra siren that shows offline in the app has lost its connection to the base station, and since the siren is the part that makes the noise during an alarm, an offline siren should be fixed rather than ignored. The extra siren is a plug-in or wall-mounted unit that responds to the base station's commands, and it depends on a good link and on power. Check the siren first: is it plugged in, with its light on, or, if it has a battery backup, is the battery in good shape?
The checks in more detail
A siren on a switched outlet, a power strip that is turned off or an outlet that was tripped by a breaker shows offline because it lost power. Try another outlet to test. Then the base station. Look at the base station's own status in the app: if the base station is offline or has a problem, every device goes offline. Restart the base station by unplugging it and its power for a minute.
Check the distance between the siren and the base station, and what stands between them: thick walls, metal and large appliances weaken the link. Move the siren a little closer or relocate it to a spot in the same room as the base station for a test. If it comes back online there, the original spot is too far. SimpliSafe lets you remove the siren in the app and add it again, which clears a bad pairing. Follow the steps in the app for adding a siren, and place it so that it can be heard throughout the home.
Test the siren after it comes online: the app has a sound test that rings it briefly, so warn others in the house first. A siren that works at a short distance and not further needs a better position. Replace the battery if it has one and the light is dim. If it will not pair after these steps, SimpliSafe support can check the unit with its serial number and may replace it under warranty. Keep the system armed only when the siren is working as it should.
Differential
Likely causes of “SimpliSafe Extra Siren is offline or unavailable”, and how to tell them apart
- 1
No power at the siren
What separates it The light is off and it shows offline
How to confirm Check the outlet, the switch and the breaker
- 2
A base station problem
What separates it All devices show offline
How to confirm Restart the base station
- 3
A weak link
What separates it It works only close by
How to confirm Move it closer or relocate it
- 4
A bad pairing
What separates it The app cannot find the siren
How to confirm Remove and add it again
- 5
A failed siren
What separates it It will not pair after these steps
How to confirm Contact SimpliSafe
Before you touch a setting
Record this first — changing settings destroys the evidence
- When the problem began and what changed
- Any message on the base station or in the app
- Whether other sensors work
- The device model and the system's serial number
Try in this order
0 of 6 completedCheck the siren's power
ReversibleOutlet and light.
Check the base station
ReversibleIn the app.
Test a closer position
ReversibleNear the base.
Remove and add the siren
ReversibleThrough the app.
Run the sound test
ReversibleWarn others first.
Contact SimpliSafe
ReversibleIf it stays offline.
Model-specific
What is true of this model and not of its siblings
- Sound test
- It rings the siren briefly.
- Link
- Walls and metal weaken it.
Stop boundary
When this stops being a self-service repair
- !If the steps do not clear it, contact the maker with the model and the system details
- !Do not leave the alarm disarmed for long
- !Keep the app and the base station updated
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why is my SimpliSafe siren offline?+
No power or a weak link.
Does it matter?+
Yes, it is the alarm's sound.
Can I test it?+
Yes, with the sound test.
What if it will not pair?+
Contact support.