Honeywell T6 Pro Thermostat Offline or Not Connecting

Problem Description

Your Honeywell Home T6 Pro Smart Thermostat is showing offline in the app, not connecting to WiFi, or not responding to remote commands.

Common Causes

• WiFi network changed or password updated
• Thermostat lost WiFi connection
• Router settings blocking connection
• Firmware needs updating
• Account sync issues

Solutions

1. Check WiFi Connection on Thermostat

1. Press Menu on the thermostat
2. Go to WiFi Setup
3. Check if WiFi shows connected
4. If not, reconnect to your network

2. Verify Network Requirements

• Requires 2.4GHz WiFi network
• WPA2 security (WPA3 may not work)
• Network must have internet access
• DHCP should be enabled on router

3. Reconnect to WiFi

1. On thermostat, go to Menu then WiFi Setup
2. Select your network from the list
3. Enter your WiFi password
4. Wait for connection confirmation

4. Re-register in App

1. Open Honeywell Home app
2. Remove the thermostat from your account
3. Add it back using the MAC/CRC codes on the thermostat
4. Complete the registration process

5. Power Cycle the Thermostat

1. Turn off the HVAC breaker
2. Wait 30 seconds
3. Turn breaker back on
4. Wait for thermostat to boot fully
5. Check if it reconnects to WiFi

6. Factory Reset

1. Press Menu then go to Preferences
2. Select Reset then Factory Reset
3. Thermostat will restart with default settings
4. Set up WiFi and register in app again

When to Contact Support

Contact Honeywell Support if the display is blank or dim, HVAC is not responding to thermostat commands, or you see error codes on the screen.