I have 5 Nests installed. All have common connection (from the AC side). I had to buy 2 spare units and replace 2 base plates due to a failure that starts as a chatter in one heating circuit (W1 and W2, both chater but not at the same time, all at random). 3rd gen. The last replacement lasted 2 months before chattering started.
Google support was great this week and a new base is on the way. But as I can not leave without heat, I had to go to Lowe's and buy a new spare Nest even though I have two perfectly good "heads". I makes not sense that one can not buy the bases separately.
I have had other zones chatter with increasing frequency. These thermostats are out of warranty. I am willing to pay for spare bases but can not find these.
I thought I replied.. guess not. I had this hooked up as a 2 wire system for years maybe 8 ? It started to go into a delay mode.. no heat. I called and the said it needed a 3rd wire.. a “C”wire. Did that it worked for a few days. I called again and was told replace the base plate. So I did.. bought a new thermostat.
worked for a little over a heating season. Same issue heating delay. Called and troubleshooting said the furnace is messed up. I said the furnace works fine on the other thermostat.. then said base plate bad. Changed it again this time whole thing base plate and thermostat. Fingers crossed still working.. it’s bin a few weeks. I am a logical person. A race and mechanic by trade.. as they say “ Jack of all trades.. master of none” that’s me. So tell me why is the nest thermostat work up stairs and it’s the downstairs that always quits ? Case # 9-9454000033142
I had a unit fail - lost its ability to see wifi routers, which is another common problem. They sent a replacement (refurb) under warranty and its battery was dead and would not recharge. They sent another one and the same problem??? I had heard about a potential base issue so I installed the one that came with the replacement and it fixed it!! Nest no longer carries the base as a replacement part. I have three and they will be out of warranty by fall. Has anyone found a replacement that is more reliable?