Ecobee Thermostat Not Connecting or Temperature Issues

Ecobee Thermostat Troubleshooting

Ecobee thermostats connect via WiFi and support HomeKit, Alexa, and Google Home. They're known for their room sensors that improve comfort.

Won't Connect to WiFi

Initial Setup

1. Power on the thermostat (must be wired first)
2. Follow on-screen prompts to select your WiFi network
3. Enter your WiFi password
4. Create an Ecobee account when prompted

Connection Issues

• Ecobee supports both 2.4GHz and 5GHz networks
• Check WiFi signal strength in Menu > Settings > WiFi
• Restart your router if other devices are having issues
• Reset network settings: Menu > Settings > Reset > Reset WiFi

Thermostat Won't Turn On

Power Issues

• Check that HVAC breaker is on
• Verify wiring matches the Ecobee wiring diagram
• A C (common) wire is required - use the included PEK if you don't have one
• Check for blown fuse in HVAC system

PEK (Power Extender Kit)

If your system lacks a C wire:

• Install the PEK at your furnace/air handler
• Follow Ecobee's PEK installation guide carefully
• PEK provides power through existing wires

Temperature Inaccurate

• Ecobee uses the built-in sensor by default
• Add SmartSensors for more accurate readings (they average)
• Keep thermostat away from direct sunlight or drafts
• Calibrate in Menu > Settings > Installation > Temperature Correction

SmartSensor Issues

Sensor Not Pairing

1. Pull the battery tab or reinsert battery
2. On thermostat: Menu > Sensors > Add Sensor
3. Hold sensor near thermostat during pairing
4. Sensor LED will blink green when paired

Sensor Shows Offline

• Check battery level (CR2032)
• Move sensor closer to thermostat (range ~45 feet)
• Remove and re-pair the sensor if persistent

HVAC Not Responding

• Check system settings match your equipment
• Run equipment test: Menu > Settings > Installation > Equipment > Test
• Verify wiring if specific functions don't work (heat, cool, fan)
• Check if a safety switch has tripped (condensate pan, etc.)