Nest 3rd Gen and new furnace with AC

[Schink]

I have a Nest 3rd Gen learning thermostat that worked great with my old furnace and AC.  Wiring is 4 solid copper wires.  We recently had an new furnace and A/c installed and now the Nest doesn't work.  Power seems to cut out when A/c is call.  The A/c is a Lennox EL16xc1-030-230A01 and the furnace is Lennox EL296UH070XV36B-12.

Thanks

[Charles333]

Should be at least 5 wires.   R, Common, Y ,W and O/B.  

[JenniferV]

Hi folks,

Thanks for the help here, Charles333.

Schink, how's it going? Were you able to see the wires on your thermostat as mentioned by Charles333? Could you please share a photo of your wiring and provide the power reading on your Nest Thermostat?

I'll look forward to your response.

Thanks,

Jennifer

[MelbaDT]

Hey there, 

Checking back in — how's it going? Still need our help?

Best, 

Melba

[Ryan_G]

Hey there,

Thanks for being here in the Google Nest Community. 

I'd like to bump in here and make sure that you’ve seen our response.
Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Have a great day.

Best regards,
Ryan