Exact model-family answer directory
SimpliSafe Smoke & Carbon Monoxide Detector troubleshooting
SimpliSafe Smoke & Carbon Monoxide Detector (Smoke & Carbon Monoxide Detector (no separate model number — the serial number is on the label on the back of the detector)): battery (from SimpliSafe Support); lifespan; disarming, and a fix for each symptom below.
Confirm the model first
Which units this covers, and how to tell yours is one of them
- Model numbers and patterns
- Smoke & Carbon Monoxide Detector (no separate model number — the serial number is on the label on the back of the detector)
- Not applicable to this hardware
- This SimpliSafe Smoke & Carbon Monoxide Detector does not have the hardware for: will not stay connected to Wi-Fi; does not respond to voice control; will not connect through Matter, HomeKit or another platform.
Published specification
What is true of this model and changes how you fix it
- StandardsSimpliSafe states it complies with all applicable UL safety standards — UL 217 for smoke and UL 2034 for carbon monoxide. It is designed for residential use.
- Building codeSimpliSafe states that when paired to the Base Station it forms part of a Household Fire Warning System and therefore meets most building code requirements for smoke and CO detection, while advising that local municipality requirements be checked. Note the dependency: the code argument rests on it being paired, so an unpaired detector is a different proposition.
- Sloped ceilingsSimpliSafe specifies installing within 3 feet of the peak on a pitched ceiling, but NOT within the apex — four inches down from the peak. Air at the very apex is dead space and can delay detection.
- Working togetherSimpliSafe documents that the Base Station and an Extra Siren sound in unison during an emergency, so the alarm is not confined to wherever the detector happens to be.
- Battery (from SimpliSafe Support)Two CR-123A lithium 3 V batteries, with a life expectancy of up to 2 years depending on placement and use.
- LifespanSimpliSafe's guide does not state a lifespan for the detector itself, so the usual 10 years for smoke and CO alarms is a general rule, not a SimpliSafe figure.
- DisarmingTechHive found it better at false alarms than earlier sensors but a hassle to disarm.
Where these figures were read. simplisafe.com/smoke-and-carbon-monoxide-detector product FAQ
Manufacturer support for this product line. SimpliSafe Support — Smoke & Carbon Monoxide Detector Installation Guide. SimpliSafe's own Smoke & Carbon Monoxide Detector placement and installation article.
Also read for this model. SimpliSafe Support — How to replace smoke and carbon monoxide detector battery.
Exact questions
Questions that only have an answer for the SimpliSafe Smoke & Carbon Monoxide Detector
Does the SimpliSafe Smoke & CO Detector meet building code?+
SimpliSafe states that when paired to the Base Station it is part of a Household Fire Warning System and therefore meets most building code requirements, and advises checking your local municipality. The pairing is load-bearing in that answer — an unpaired detector is not making the same claim.
Is it UL listed?+
SimpliSafe states it complies with all applicable UL standards — UL 217 for smoke and UL 2034 for carbon monoxide. Those are the two separate standards for the two separate hazards this single device covers.
Can I install it on a sloped ceiling?+
Yes, with a specific constraint: SimpliSafe says within 3 feet of the peak but not within the apex — four inches down from it. The very apex is dead air, and mounting there delays detection, which is the whole reason the exclusion exists.
Will the alarm sound elsewhere in the house?+
Yes — SimpliSafe documents the Base Station and an Extra Siren sounding in unison during an emergency. That matters for a detector on a top landing or in a basement, where the local sounder alone may not wake anyone.
Is it suitable for a rental or commercial property?+
SimpliSafe specifies it as designed for residential use, and directs code questions to your local municipality. A commercial premises is outside what this device is specified for regardless of how similar the space looks.