Symptoms
- Sensor shows no temperature in the app
- Sensor reading seems way off from the room
- Sensor appears offline
Likely causes
- CommonDead or low sensor batterySmall coin-cell batteries in remote sensors typically last about a year.
- CommonSensor out of range of the thermostatThese sensors use a short-range wireless signal that weakens with distance and walls.
- PossibleSensor placed near a heat or cold sourceDirect sun, vents, or appliances near the sensor will skew its reading.
- PossibleSensor unpaired or needs re-pairingA sensor can occasionally drop its pairing with the thermostat.
What to do
- Replace the sensor's coin-cell battery, usually a CR2032, even if it seems to have some charge left.
- Move the sensor closer to the thermostat temporarily to see if range is the issue.
- Relocate the sensor away from direct sunlight, vents, lamps, or electronics that could skew its reading.
- Open the app's sensor menu and check its connection status, re-pairing it if it shows disconnected.
- Restart the thermostat by removing it from its base for 30 seconds if the sensor still won't reconnect.
Tools and parts
- CR2032 coin-cell battery
Remote temperature sensor batterySearch: “CR2032 battery”
When to call a pro
Contact the manufacturer's support for a replacement sensor if a fresh battery and re-pairing don't restore a reading.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.