⚠
warning Honeywell
Error Code 400
No WiFi signal — the WiFi signal has been lost and the thermostat cannot connect.
? What Causes This
WiFi router is offline or out of range.
✓ How to Fix It
Wait 5 minutes for the thermostat to reconnect, or select an alternate WiFi network in the Resideo App. See page 11 for reconnection instructions.
Source: page 28 of the official manual
From the manual
