“I purchased the 3rd generation Nest thermostat. It requires an extra wire. My old system only has 4 wires and the electrician is unable to connect to my a/c system. Will the Nest E white connect with just the 4 wires?”
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Yes, the fourth wire connection would be to operate an additional system such as a heat pump.
Sorry, there was a problem. Please try again later.You can call the Nest 800 number and get them on the phone quickly. Just have available a picture of your existing thermostat wiring and they will walk you through the process, and also determine if your system is compatible with Nest. I called them up and immediately got them on the phone. 855-469-6378
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