Shaun Merrigan's Information Pages

Tag: NEST Charging

NEST Thermostat Update and Voltage Measurements

Posted by Shaun Merrigan in NEST Thermostat, News, Tech. 1 Comment

18th November

NEST Thermostat Update and Voltage Measurements

I have had my NEST Gen1 for almost 16 months now and I probably could not go back to a regular dumb thermostat, given the choice.  The NEST charging problem has been solved by connecting the “C” (AC Common) wire from my furnace to the NEST.  See this post for details: Nest Thermostat Charging Solution

I find the monthly NEST Energy Reports very useful, and I am saving them so that when I make important changes to our house (new windows, more insulation, more efficient furnace, etc) I can see an actual difference.


I thought it would be helpful to anyone still troubled by the charging problem if I posted my NEST reported and measured voltages:

Furnace running (heating) NEST Reported Voltages: Voc 38.33V, Vin 31.57V, Vbat 3.864V, Lin 100mA (i)

Voltage measured between Rc and C (Power and … Read More »