Spectacular Nest Thermostat Common Wire

Nest thermostat no common wire nest thermostat needs no common wire problem solved how to connect the nest thermostat without a common wire.

Nest thermostat common wire. It only provides constant power to your thermostat. Use a common wire with a nest thermostat or suffer the consequences technology editor bill wong takes some unwanted time to replace his nest thermostat after the heating system went south. Read enough nest reviews and you ll eventually spot a common theme.

It terminates at the air handler or furnace. Nest thermostats don t typically. The c wire or common wire enables the continuous flow of 24 vac power to the thermostat.

Contrary to its name the c wire isn t actually all that common. To make it continuous requires a common wire to complete the circuit. In general the heating wire often white goes into the w port the cooling wire often yellow goes into the y port the wire that sends power from the hvac system to the thermostat often red goes into the r port the fan wire often green goes into the g port and the common wire often blue which should go into the c port.

When everything is complete the thermostat will have a continuous supply of 24 volt energy. Nest says you don t need a c wire until you do. We were curious about these seemingly random nest failures so we called a few local hvac companies and asked them for their off the cuff opinion on nest thermostats.

One of the m. Unlike other wires connected to your thermostat a common wire doesn t control heating or cooling functions. Technically speaking power flows from the r red wire but not continuously not on its own anyway.

Regarding thermostats one thing you do have direct control over relates to a single wire called the c or common wire. The green wire connects to terminal g on your thermostat. The previous homeowner may have made the wires whatever color they wanted or they could have run any wire they had available so never rely on color alone.