Learning Thermostat causing blower fan to turn on, off, then on.

[rrubida]

I replaced my Nest Thermostat with a Nest Learning Thermostat, and since the switch the blower fan will turn on then off while the furnace warms up.  The fan will then turn back on with a vibrating sound, and work properly.  I did not have this issue with the other thermostat.

Only wiring difference is the learning thermostat has a rc and rh (Original just had R), and I have the wire in the rh slot.

Any suggestions?

[maedacortez]

Hi rrubida,

Thanks for reaching out! To resolve this issue, could you please send a picture of the backplate so I can check if the wires are connected correctly If the wiring looks good, I can then help you find the best solution.

I look forward to your reply.

Regards, 

Manuel