Nest thermostat N72 code, Rh detected, No connection to equipment

[BMorin]

Trouble shooting multi zone nest tstat installation, connected to hot water boiler with three zone vales and A/C split system. Two heating zones, connected to heat only zone vale no issues, Zone connecting Hot water boiler zone valve and A/C split  sytem with common from A/C has error code N72. dry contacts W1 and Rh wiring work boiler zone when twisted together. When connected to Nest 3rd gen., smart learning tstat no heat operation. Error code N72 Rh detected, No connection to equipment.

[CaptainJeff]

I have the same exact problem.  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.  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.  

[CaptainJeff]

It's criminal when a company sells a product that they know is defective, and then blame the customer.  

[SofianeMTL]

This did not work and I still have the same problen, Rh not detetcted and my forced air conditionner starts at the same time as my basboard heaters

[Jake]

Hey all,

Sorry for the late reply. I wanted to follow up and ensure you are good to go. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[Jake]

Hey all,

I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity. 

Best regards,
Jake

[GarrettDS]

Hey folks,
It looks like we haven't heard back from the OP so I'm going to go ahead and lock the thread. If you have any further questions or concerns, feel free to create a new thread.

Have a great day,
Garrett DS