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Sounds like issue may be with furnace rather than thermostat.Are you able to do some troubleshooting when it says it is on but really is not and do you have a multi meter for troubleshooting?
It is possible if filter gets dirty that might restrict air flow but return grille is probably not in the basement.
When it ails,, look on control board in furnace and see if we have a flashing light on board.We will go from there.
That is where your filter is located usually.It is where air is drawn into furnace.If no filter in grille,it will be in bottom of furnace.
It is possible, but lets do some troubleshooting when you are there. WE will check between the C and W terminal on furnace control board to verify if thermostat is sending signal to furnace to come on if there are no error codes.
I may be gone to vote,but will be in and out.
You will see letters by the terminals on furnace board where thermostat wires connect to furnace
OK remove bottom panel and hold door switch in and tll me if you see a light on board
Give me model ob furnace and tell me what light is doing
That is fine.Heading out in field on an install. Will be back in office this evening
I am back in office when ready
Look in burner compartment for model and tell me patter of flashing
OK that is normal.
Do this. Use a jumper wire or needle nose pliers and touch R and W terminals on board and see if furnace comes on.
OK but not coming on by thermostat?
OK to determine if issue is furnace or thermostat we want to do exactly what we just dis when it should be on and will not come on. If jumping R and W makes it work,but thermostat does not we know issue is the Nest. If not we will heck for an error code indicated by the number of blinks on board.
THat is fine. Just come back to question at that time
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