DON'T! BRING YOUR NEST LEARNING THERMOSTAT BACK TODAY TO SAVE HASSLES WHEN IT FAILS....TOMRROW.
I have a problem happening right now. Installed Nest Learning on 1 April. Ran heat through May, then AC and Heat into June until we went to straight AC for summer. Multizone heating system (forced hot water) with two Nest E's on other zones. Testing heating system from Nest Learning on 6 Oct. Taco box just kept clicking. Thermostat showing N72 error (no power to Rh). It's not true. You will see other posts about this across the web. Call heating company for PM b/c I assumed the problem was with boiler. First thing tech said when he arrived was "you have a Nest thermostat, correct?". He performed the same troubleshoot you did (W to Rh wire - triggered heat). Notified Google and then sent me new baseplate (arrived last night and installed - no fix. Same exact issues). Contacted them again this morning and just went through 2 hours of painful chat troubleshooting with totally useless reps (Madison and then Enzo). If you get them, stop the chat, pull the Nest out of your house and get another brand. I'm done with having a teenager in their basement ask me if my house is powered and calling it support/troubleshooting.
MORAL OF MY STORY: GOOGLE SUPPORT KNOWS ABOUT ALL THE ISSUES BUT DOESN'T CARE. THEY WILL TIE YOU UP AND HAVE YOU PERFORM ALL MANNER OF CIRCUS TRICKS, ALL THE WHILE MAKING YOU THINK YOU ARE ACTUALLY GETTING CLOSER TO THE PROBLEM. SEND THEM AND THEIR PACK OF TEENAGE HELPDESK REJECTS A MESSAGE BY REFUSING TO BY THEIR JUNK!
