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I bought a Nest to upgrade my thermostat. I had to change some of the wiring from the Nest to the control- previously 1-2-R-C, to Rh-G-W-Y.
The fan runs with the AC and the fan runs with the Heat- However the fan does not run with the Fan Schedule, or on Demand when using the Nest thermostat functions.
I have a Emerson 50C51-707 Two-Stage Integrated Furnace Control for Furnace with Variable Speed Fan.
Anything people recommend I look into?
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You really should have a common with the nest. Their claim of no common required is very misleading, and only applies in a small subset of situations. Use their adapter kit if you don't have enough wires.

The real question is why would you replace a communicating thermostat with a nest? It's a serious downgrade.

Your G wire at the furnace doesn't appear to be seated correctly.

PS. You've swapped the colour codes. Generally White is for W and Green is for G.
 

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Your nest will provide inferior comfort compared to the communicating t-stat - especially as wired, to not control the heat stages.

The communicating stat only 4 wires can slow blower down to improve dehumidification on demand in a/c mode, adjust continues fan airflow, give error code information.

To fix all your issues, put the communicating t-stat back on and change the wiring back.

Wifi remote control is very much gimmicky - the only real benefit I see is logging and monitoring abilities. Who cares if it is a little uncomfortable for a few hours after being away and you have to wait for it to heat up or cool down?
 

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I would suggest returning to the old thermostat. Your new Nest is a dumpster fire of constant problems and issues.
You'll have to run a common wire as even though they claim one isn’t needed, it is. Not having a common will amplify the issues you’ll experience with the Nest.
 

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I would suggest returning to the old thermostat. Your new Nest is a dumpster fire of constant problems and issues.
You'll have to run a common wire as even though they claim one isn’t needed, it is. Not having a common will amplify the issues you’ll experience with the Nest.
Too bad the marketing is still working - people are still buying them, just like 1" 3m allergen filters.
 
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