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The "C" or Common wire provides a way to get constant 24VAC power to the thermostat, now required by many newer thermostats with WiFi and/or touchscreens.

0
votes
If we read your manual correctly it states to install the PEK. https://www.ecobee.com/wp-content/uploads/2013/12/ecobee3_InstallationGuide.pdf You can also look here: https://www.stevejenkins.com/bl …
answered Mar 14 '18 by Ken
2
votes
You said your old thermostats C-Wire did not work so you wired a new one. You said your meter only measures 50V or higher (I never saw a tool like that before) - so how do you know the c wire was not …
answered Apr 1 '18 by Ken
2
votes
What this looks like to me is that your 24VAC transformer is not functioning properly. C to G should be 24VAC - your reading is what looks like an induced voltage - where your wire just kind of runs …
answered Jul 6 '18 by Ken