E294 error, Google nest

[Smcd]

My old unit had 4 wires, G, W, Y, RC along with a jumper from the RC to a terminal listed only as 4. I removed the jumper wire, but plugging the RC wire into the R terminal on the nest gives me an E294 error. I've tried reconfiguring, restarting, and resetting multiple times. I'm thinking I might need the nest power connector.

Before doing that, is there anything I'm missing out could do differently?

[Patrick_Caezza]

You can check to make sure the fuse on the control board in the furnace/air handler didn't blow.

The Nest compatibility checker provides a note when using the Google Nest Thermostat (mirrored) that says

• Nest thermostats are designed to work without a common ("C") wire in most homes. During installation, a small number of customers may find that the Nest Thermostat does not receive sufficient power. The Nest Power Connector or a C wire may be necessary. See g.co/nest/cwire for details.

If the fuse isn't bad, then I would suggest installing the Google Nest Power Connector.

[Markjosephp]

Hello there,

I wanted to ensure that everything was covered here.

Thanks for the input. @Patrick_Caezza.

I appreciate all the steps you've taken, @Smcd. I'm checking in to see if you were able to inspect the fuse on your equipment from the control board, which might cause a power loss. Also, make sure that all wires from your thermostat are properly connected and the tabs are pushed down.

Please let us know if you need more help.

Regards,

Mark

[Jhonleanmel]

Hi folks,

Chiming in to see if you still need assistance with this. Let us know if you have additional questions ― we'd love to help.

Best,
Mel

[Markjosephp]

Hello Smcd,

I'm checking in to make sure that you've seen our response. Please let us know if you have any additional questions or concerns before we lock this thread in 24 hours. 

Thanks,

Mark