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They don't. And why would you want to trade it out??? You are currently running off the communicating terminals. If you are going to install a nest you will have to match the nest wiring with the legacy/24volt terminals on the furnace control board and likely the outdoor unit will need rewired as well. Not extremely difficult but why??? The nest is not what it's cracked up to be!!
I am a Nest Pro installer. The bast way would be to call Nest at: 855-469-6378 They will be able to walk you through it better than I can on an internet chat board. The will pick up in less that 5 minutes most of the time.
I am a Nest Pro installer. The best way would be to call Nest at: 855-469-6378 They will be able to walk you through it better than I can on an internet chat board. They will pick up in less that 5 minutes most of the time.
Nest does have a 2 stage stat, but they are pieces of junk just like the single stage ones. Because you did not turn the power off you blew the internal 5 amp, car style, blade fuse. TURN POWER OFF and remove electric panel of furnace and locate fuse. BTW the single stage nest would still work but you will lose your efficiency rating. Always turn power off when messing with wires.
I'm guessing your blue wire is your common and red is hot. You need a voltage meter. Should have 24 volts with R&B. If not either you blew the 5 or 3 amp fuse when hooking up or your wiring is wrong. If there is an outlet close you can test red to ground and see if you have 24. If you do have 24 blue is either not common or its unhooked or shorting on something. Good Luck!! Fuse would be internal , car style, turn power off and open furnace to inspect.
Remove the thermostat from the system (just remove the R wire from the circuit board in the FAU) and see if the problem continues. If it doesn't fix it, the circuit board on the furnace should be replaced (something would be seriously wrong with the controls). If the problem stops and you have a nest thermostat (they do this kind of thing often) talk to Nest customer support, they have a solution using a capacitor. If you dont have a nest, replace your current thermostat as it would be faulty.
Do you have a common wire? The nest thermostat needs the common 24V C wire installed to keep the battery charged fully. Nest should tell consumers of this problem, but they don't. Its required for any powered thermostat. Even the new fancy Honeywells with touch screens etc..
Gotta realize the battery cannot run the display and wifi plus all the sensors for very long.