The Honeywell WiFi Smart thermostat was operating fine when on AC until the heat went on this fall. Now, each time the fan goes on, the thermostat loses the connection, turns blank, then reboots itself to the Honeywell screen and returns to normal until the next time the fan goes on and repeats the reboot process.
Here are pics of the furnace and Honeywell WiFi Smart Thermostat Wiring. On the furnace, two blue wires go to the C terminal and one black wire goes to the G terminal while the Honeywell thermostat has the blue wire connected to C and no black wire but a green wire connected to G. There is no black wire. I suspect the G wire on the Honeywell is the problem. What has to be done to get it to operate without rebooting day and night? I tried disconnecting the G wire in the thermostat and the thermostat continued to go blank and reboot each time the fan went on. Any ideas to fix this?