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C wire for Nest Thermostat

comacho244
Community Member

‎12-17-2023 08:05 PM

Hi, I got a Nest thermostat and having a problem with the c wire. my q. If C wire only to power the thermostat, can I just connect a bridge between R or W. By the way I have only a heating system steam boiler.

Thank you

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Markjosephp
Community Specialist
Community Specialist

‎12-21-2023 09:49 AM

Hello comacho244,

Welcome to the Google Nest Community! I'd be happy to take a look at this for you.

The C wire, or common wire, is typically used to provide a constant power supply to the thermostat. Connecting a bridge between R (power) and W (heat) might work in some cases, but it's not the ideal solution as the Nest Thermostats don't require a jumper wire.

Instead, it's recommended to use a dedicated C wire for a more stable power supply. If your heating system doesn't have a C wire, you may explore alternative solutions, such as using an external transformer to provide power or utilizing a device like the Nest Power Connector.

Let us know if you have more questions.

Regards,
Mark

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