Nov 26, 2019 · How to Install a WiFi thermostat without C wire. If you don’t have a common wire and want to install a smart thermostat, you still have quite a few options. Option 1 is to buy a smart thermostat that doesn’t require a C wire. Thermostat E Installation Guide. We take your privacy seriously. The Nest Thermostat E works with most 24V systems, including forced air, variable speed,. Put this wire in the Nest Thermostat’s O/B connector. • If there’s a white wire in the connector labeled both W and O/B.

Jan 21, 2019 · For instance, the Nest Thermostat and the Nest E Thermostat can usually run without a common wire — see below for more information. Other thermostats, like the Ecobee, come with an adapter that can be used if you already have four wires, but no common wire — Ecobee thermostats are also discussed below.</plaintext> First question is if your heating system even has a place for a C wire to attach to. From all of the problems reported here you may have a 50% chance of it working without a C on a two wire system. Using a transformer is fine with the Nest 3rd gen but is not as good for the Nest E. One way to think of it is when a stat is operating without a C wire, it's operating on batteries. If you trust power stealing schemes to work correctly all the time then by all means go for it. Personally i'd rather just spend the money to have an electrician install a proper C wire. Sep 19, 2019 · Hi just bought a nest e thermostat. Ive included a picture of the wiring for the old thermostat and the connections for the new nest thermostat. I just want to make sure it’s compatible before I get someone to install it. Which wire goes to which connector for want of a better question.</p> <p>Oct 23, 2019 · In all likelihood, as thermostats continue to develop that are going to need more wires rather than less. If you do not at present have a ‘C’ wire, or a spare that wire that you can use, it may be worth considering having a new cable run from your heating / cooling control box to the new thermostat. Other models, like the Nest Learning Thermostat and the Honeywell Lyric can use a C wire, but they don't require it. If your HVAC system doesn't have a C wire, these thermostats and others instead.</p> <p>Use a Common Wire With a Nest Thermostat or Suffer the Consequences William Wong. make sure you have a C wire. By the way, the heat-only thermostat is now the original mechanical thermostat. If there is no wire, you don’t have a c wire and will probably want to get one. If there is a wire connected, note its color and go back to your thermostat. Whichever wire matches the color, should be your c wire. Four Ways To Fix the C Wire Problem. Don’t get stuck pulling your hair out trying to run a smart thermostat without a c wire. 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