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Fan only mode not working - learning thermostat.

Geomat
Community Member

Nest learning thermostat 3rd generation running latest firmware 6.2-27. Five wires Rc-W1-Y-G-C coming from a trane forced air gas furnace.  Problem: Fan only mode do not function. Tried to enable the fan from Nest, Google home app when the thermostat is not in an off setting.

Originally installed by a Google recommended pro, and verified fan only mode worked.

Tried with support provided replaced thermostats, and works first time. Stops working after a software upgrade, which happens automatically.

Help appreciated.

Thanks.

 

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