Alright, so I absolutely love the Nest - as it seems every Nest owner does. I was using it all leisurely during the summer and enjoying all of its benefits - but then when winter came - my Nest starting wigging out.
I thought originally it might have been my setup at my condo. My condo is one of those buildings where it's either "COOL" or "HEAT" on. Not both. So at one point in the winter, the building switched the heat on.
Now, even with my old thermostat - it's one of those on/off dealies. So if my thermostat was set to cool - the heat would actually turn on when the thermostat was "Cooling". But that's a separate issue. This is true of all thermostats for these types of buildings.
No - the issue that I was having separate. When I switched to heating, on the Nest - and when I set it to temperature that was higher than the current room temperature - the Nest should have started heating my place right?
Here's what happened (ie. the symptoms in case you're having the same issue)
- Nest V1
- Electric Forced Air Furnace
- Wires: RH, Y1, W1, G
- The Nest was in "HEAT" mode
- I set the Nest to a temperature hotter than the current temperature to engage heating
- The display would show "Heating" for about 2 seconds, and then go to "Delayed for 3:00 Minutes". My fan would kick on for a bit, but that was it.
- After the 3:00 minutes, same thing would happen "Heating" for about 2 seconds, and then back into "Delayed for 3:00 Minutes"
- Here's the telltale sign - just after "Heating" for about 2 seconds, and just before "Delayed for 3:00 Minutes", the little green LED in the sensor area would blink (this should have been a sign to me).
- So it would end up in the endless loop of "Heating" for about 2 seconds, and "Delayed for 3:00 Minutes" with that green LED flashing.
I called Nest Support - and it turns out it was a Voltage issue. Even though I was getting good voltage readings, there was an issue.
How to solve it?
I'm not taking any liability for this - and you should probably call Nest support - but you can try the follwing.
This has actually become my permanent work-around, because I don't feel like re-wiring my condo. The work-around is to UNPLUG THE COOLING "Y1" WIRE from the Nest during Heating seasons like Winter - so you just have RH, W1, and G. This apparently reduces the load or something. This works perfectly for me. I just have to unplug the wire/plug it back in once a year.
Nest support told me to run a wire from the furnace board's "Common" terminal to the "C" terminal on the Nest. Basically you need a common wire. However, I didn't have any extra wires long enough in my setup to do this.
Hope this helps some peeps.