The thermostat seems to be heating and cooling successfully but the fan is running constantly. I don’t think it’s a setting (fan is set to auto not on, and is set to 0 min per hour), so maybe a wiring issue?
I sent my husband in the crawspace for the initial unit picture, he noticed it but assumed it may have been a ground wire. We had some HVAC work done, does that look like something they may have missed reconnecting?
If taking the G wire off makes the fan not run, then it’s not a wiring issue, rather the thermostat is telling the fan to run. You could have a defective thermostat, or you might have one of the settings in advanced setup set improperly. With the thermostat in the “off” mode does the fan run?
I am having the same issue. I have another Wyze thermostat that is connected to a different AC unit and fan control works fine there. So moved it to this unit for testing and fan turns on as soon as it is connected. Same thermostat behaves differently on different unit without reprogramming.
The original Honeywell thermostat does not do this. Checked the voltages (had only power connected for this testing) - Wyze - when fan is off, the G wire voltage sits at 3.6V, when fan is on it goes to the Rc voltage. Checked on the Honeywell and when fan is off, the voltage goes to almost 0V.
I think this is a Wyze issue, Wyze needs to short G to ground to turn fan off? Looks like it depends on the AC system.
That is a similar situation to mine. The G had low voltage even when not being called for, causing the fan to run constantly. This was for a brand new HVAC Heat Pump system, so after we did our own troubleshooting for a few days we had the installers back out who confirmed it was the thermostat and we let them install the Honeywell they had.
The fact that your thermostats behave differently on different HVACs, maybe I didn’t have a bad thermostat. Although my wiring setup should have worked, perhaps it was just a compatibility issue.