Exact model-family answer directory
SimpliSafe Temperature Sensor troubleshooting
SimpliSafe Temperature Sensor (Temperature Sensor — there is no separate model number, only a serial number inside the battery compartment): battery and range (from SimpliSafe Support); battery life (from SimpliSafe Support); test (from SimpliSafe Support), 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
- Temperature Sensor — there is no separate model number, only a serial number inside the battery compartment
- Not applicable to this hardware
- This SimpliSafe Temperature Sensor 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
- What it doesSimpliSafe states it triggers an alarm if the home drops below 41°F, to catch a freeze before pipes burst, and that an upper limit can also be set for pets, paintings and plants. 41°F is the published lower threshold.
- ReadingsSimpliSafe provides access to hourly readings. Hourly is the reporting cadence — a value that looks stale by up to an hour is the sensor working as specified, not a fault.
- BatteryOne CR-2032 Lithium 3V cell, included, up to 5 years depending on usage.
- PlacementSimpliSafe recommends installing near a thermostat, or near exposed plumbing vulnerable to freezing. 1.5 x 2.25 x 0.62 inches, peel-and-stick.
- Battery and range (from SimpliSafe Support)One Duracell CR-2032 lithium 3 V battery, with a customizable alert range of 0 to 127 degrees F.
- Battery life (from SimpliSafe Support)The single CR-2032 lithium battery has a life expectancy of up to 5 years depending on placement and use.
- Test (from SimpliSafe Support)Put the system in Test Mode, then press the button on top of the sensor. The Base Station announces "Freeze Sensor" to confirm the test. If you do not hear it, check that you can hear the Base Station from that spot, then the battery, then the Base Station location.
- Label and pairingA SimpliSafe temperature sensor carries its serial on the back and is added through the app. Name it for the room so that alerts are clear.
- PlacementPut the sensor where the temperature matters, away from heaters, vents and direct sun. A basement or a crawl space with pipes is a good spot. Mount it at about shoulder height for a true reading.
- AlertsSet low and high thresholds in the app. A low alert a few degrees above freezing gives time to act. Check that the right people receive the alert.
- Choosing thresholdsA low threshold a few degrees above freezing warns of a heating failure. A high threshold warns of overheating in a closet or a cellar. Set both from the app, and test the alerts with a short change in temperature.
- Battery and rangeThe sensor's battery lasts a couple of years. The app warns you when it is low. If it goes offline, check its distance from the base station and move it closer.
Where these figures were read. simplisafe.com/temperature-sensor Features list
Manufacturer support for this product line. SimpliSafe Support — Temperature Sensor Installation Guide. SimpliSafe's own Temperature Sensor placement and threshold article.
Also read for this model. SimpliSafe Support — Temperature Sensor not responding; SimpliSafe Support — Temperature Sensor category; SimpliSafe Support — Testing the Temperature Sensor.
Exact questions
Questions that only have an answer for the SimpliSafe Temperature Sensor
At what temperature does it alarm?+
SimpliSafe states below 41°F for the low threshold, chosen to catch a freeze before pipes burst rather than after. An upper limit can be set separately, which is what people use for pets, artwork and plants.
The reading looks out of date.+
SimpliSafe provides hourly readings, so a value up to an hour old is the specified behavior rather than a stale display. Judging this sensor by a live-refresh expectation produces a fault report where there is no fault.
Where should I put it?+
SimpliSafe recommends near a thermostat, or near exposed plumbing vulnerable to freezing. Those are different jobs: near the thermostat tells you about the house, near the pipe run tells you about the thing that actually bursts. Pick according to which you are protecting.
Why does it read differently from my thermostat?+
Because it is measuring a different place. A sensor near an exposed pipe run in an unheated void will legitimately read far below a thermostat in a heated hallway, and both are correct. That difference is the point of putting it there.