Emerson Sensi thermostats offer WiFi control with broad ecosystem compatibility. This guide covers common issues.
Thermostat Won't Connect to WiFi
Setup issues:
- Sensi app: Use Sensi app for initial WiFi setup
- 2.4GHz only: Most Sensi models only support 2.4GHz
- Power: Thermostat needs power - check C wire or batteries
- Reset: Menu > About > Factory Reset for full reset
- Router distance: May need closer to router or WiFi extender
HVAC Not Responding
When heating/cooling won't start:
- Mode: Verify correct mode (heat/cool/auto) is selected
- Setpoint: Temperature must cross setpoint to trigger
- Wiring: Check all wires are connected correctly
- System type: Configure correct HVAC system type in settings
- Safety delay: Compressor has built-in delay to prevent short cycling
No C Wire Installation
For systems without C wire:
- Sensi Touch: Sensi Touch can work without C wire (uses batteries)
- Add-a-wire: Can use add-a-wire kit to create C wire
- Power extender: Some systems support power extender
- Battery backup: Batteries provide power when no C wire
Geofencing Not Working
Location-based automation issues:
- Location permission: Grant "always allow" location to Sensi app
- Geofence radius: Adjust geofence size if triggering too early/late
- Battery optimization: Disable battery optimization for Sensi app
- Multiple users: Set up family members in app for better presence
Smart Home Integration
Connecting to platforms:
- HomeKit: Native HomeKit support on compatible models
- Alexa: "Alexa, set thermostat to 72"
- Google Home: Link Sensi account
- Home Assistant: Sensi integration available