Gen3 Learning Thermostat, PowerConnector (18/4 wiring with C-wire absent)

rameshjay — Sun, 21 Jul 2024 21:26:17 GMT

Current Setup: Nest Gen3 Learning Tstat, Attic - New CARRIER (entire) System (single_stage H&C) + Control Board; 18/4 wiring (home built in 200X w/ old Tstat, hence Nest PowerConnector in lieu of C-wire :

Brief historical notes:

Purchased home '21
Gen3 Tstat purchased circa Q1 '19, installed (most likely) with indifference to 18/4 wiring lacking C-wire
N PowerConnector - added in Q2 '22 after receiving - despite weekly recharges using micro-USB - numerous Low Battery signals leading to disconnects from SSID and eventually shutting down and causing headaches)
Q3 '23: Total replacement of HVAC system by a Contractor in whom we have little confidence in HVAC competence, and even LESS on their Nest knowledge. Contractor reconnected PowerConnector and felt that Tstat wiring was fine (they claimed Nest Pro certification, but failed to demonstrate it)
numerous calls were made to Nest support - most of them were helpful, but more recently they suggested hiring a NestPro/HVAC person to troubleshoot
today's Nest TechSupport, using techsee.me session, pointed out Settings>Equipment screen missing PowerConnector as below

Euipment_Missing_PowerConnector

saw the wiring by the PowerConnector @ the CB and felt everything looked right in the Attic,
she suggested that the PowerConnector might be defective.
Troubleshooting section of "Nest Power Connector Pro Installation Guide" states -
On the Nest Thermostat, the Power Connector is not shown under Settings > Equipment
The Nest Thermostat may need a software update. Check for an update at Settings > Version > Update
and confirm the thermostat has version 1.1 or later. Well,

Up2date_Software_Version

confirms that the issue lies somewhere else.

Nest Support has agreed to ship a new PowerConnector!

In the meantime, can anyone (with as close to a setup as mine), please post screenshots from

Settings > Equipment,
Settings > Equipment > Power Connector, AND
Settings > Equipment > Power Connector > Power Test

Many thanks,

Ramesh

Re: Gen3 Learning Thermostat, PowerConnector (18/4 wiring with C-wire absent)

rameshjay — Sun, 28 Jul 2024 19:32:17 GMT

Well, I week and NO one appears to have a similar setup - Unbelievable or post UNread so far. At any rate, here;s an Update:

Received New Power Connector (PC)
Detetcted older PC wiring similar to Heating-only System of PC Install. guide
Correctly RE-wired for H-C system with GN Teh.Supp. + techsee.me
SYStem running, but -
- Lower power symptom persists
- Power Connector is not STILL seen under Settings > Equipment (there IS a blurb on pg.22, sec. 9. Confirm PC installation - "For Nest Gen3 Learn. TsTat, TsTat E, there's no need to check)

ANYone w/ a Gen3 Learn. Thermostat, PowerConnector + 18/4 wiring with no C-wire willing to share a pic of following screens from the thermostat?

Settings > Equipment,
Settings > Equipment > Power Connector, AND
Settings > Equipment > Power Connector > Power Test

topic Gen3 Learning Thermostat, PowerConnector (18/4 wiring with C-wire absent) in Nest Thermostats

Gen3 Learning Thermostat, PowerConnector (18/4 wiring with C-wire absent)

Re: Gen3 Learning Thermostat, PowerConnector (18/4 wiring with C-wire absent)