I’m at a loss and about to buy a different brand of thermostat. My problems began last winter, apparently around the same time as many other people who began receiving e102 and n72 errors on their thermostats. Most of these people have a boiler that heats their radiators and a separate HVAC system.
The closest I have been to a normal, functioning set up since that update is my current configuration. I have the W1 wire, Rh (from boiler zone), C wire (from AC), Rc (from AC) and the G wire plugged in. I’m still receiving random N72 errors in the morning even though everything is working fine. Battery is above 3.9 volts, Voc and Vin are 34 or higher and Lin is at 200.
I attempt to connect the Y1 wire from AC that is unplugged, I get a constant E102 error and my heat will not function. How does that make any sense? The N72 error shows up every morning but just goes away and the system is fine. Once the winter is over, I can plug back in the Y1 and remove the C wire and the AC/Fan runs flawlessly. I would really like to stop getting errors when the thermostat is hooked up properly and receiving plenty of power. The only solutions I’ve seen are to install and isolation relay which could mess with my boiler or just go get a new brand of thermostat.
Any idea why I’m getting these random, useless N72 errors or if I plug in the yellow Y1 then I can’t use my heat due to an E102 error?
