Google Nest Community

absaroka6 · 01-01-2022

The fan keeps activating even when the thermostat isn't asking for heat.Thought it was a problem with the furnace, since the fan schedule is disabled, and there's no fan schedule set up on the thermostat, but when I pull the thermostat off the wall, ...

absaroka6 · 03-15-2022

You're situation sounds just like mine. If you only have 4 wires, I think you could put the G wire in the C terminal at your thermostat and do the same at the furnace. (Do this with the power off). You would then effectively have a C wire, but you wo...

absaroka6 · 01-20-2022

I think the problem is exactly what you suspect - it is having trouble keeping itself charged, and you need a C wire. It's unfortunate. I think these should never be installed without a C wire, even though the manufacturer says it's okay.

absaroka6 · 01-05-2022

This could be a power problem. Is your nest battery voltage above 3.6 volts? Do you have a C wire installed? If no, I'd recommend a C wire, however you can get one connected.

absaroka6 · 01-05-2022

Just to close this topic, I wanted to let people know that if you have a randomly running fan or constantly running fan, the solution is likely to add a C wire. Adding the C wire appears to have solved my problem. The Nest Thermostat E now has a reli...

absaroka6 · 01-03-2022

Thanks for the follow-up. I agree the symptoms don't necessarily indicate that the lack of a C wire was the problem, but I did some research , and it does seem likely the thermostat just wasn't getting enough power. There seem to be a lot of examples...

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Fan running when furnace is off

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