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Where can I purchase parts for the nest 2nd generation thermostat?

Where can I purchase parts for the nest 2nd generation thermostat?
Does anyone know where can I get the base motherboard for a Nest 2nd generation?

ANSWERS:

I tried to find a replacement part on eBay and other sites. No success. Called customer support after I read your post and they declined to sell me a replacement but offer a coupon for an upgrade.
After two calls to Nest support they say my base unit has gone bad and that I need a new one, no they don't just sell that part I have to buy a whole new Nest Thermostat but they will give me a 20% discount if I buy if from their store. Why would I spend more than $200 to but a device that breaks after a few years from a company that really does not care about their customers. My old cheap thermostat was still going strong 14 years after I put it in. I only repklace it to upgrade to the Nest. Now I will be finding a product by a company that can make something that lasts more than a few years and who supports their customers.
Just had my furnace cleaned, no wires touched, just regular maintenance, and after the technician left, the Nest Gen 2 registered a 10 degree higher ambient temperature than it actually is. After an hour chatting with a Nest technician, they offered me a 20% coupon as well. After some troubleshooting on my own, I disconnected the Yellow wire (air) on the base motherboard (to the Y port) and after a few minutes the temperature started dropping. I called back the HVAC technician who remarkably came back out to check if there was anything he could have done to cause it, but all the wires in the furnace were properly going to the right terminals there, matching the thermostat's wiring. The ONLY difference being that before the technician came, the humidifier was not working properly and now it is, but the wiring was not changed. The two white wires and the yellow wire (fan, humidifier and air) are all attached to the C terminal. Maybe there's a possibility that the humidifier actually working now is causing the issue, but it seems doubtful. I'm planning on keeping the yellow wire disconnected for now and shopping around for a new thermostat. Any suggestions? I can't afford to buy a new Nest every few years, and since they won't sell me just the motherboard, that seems like the only option.
I had the same problem with my 2nd gen base plate w1 shorted out. I called nest went through the steps to check it and they are over fighting me a whole new 2nd gen and prepaid label to send the old one back. I guess I got lucky. Still live nest.

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