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My name is ***** ***** I am happy to assist you today.Give me a moment to look over your question and gather some information .I may need to get a bit more information from you.
1. Did you turn power off before stating?(If not wires may have touched and blew a little fuse inside furnace or air handler)
2.Tell me what color wire went to what terminal on old and where you put them on new
3.Model on old and new thermostats.
We will go from here.
White should go to W2.Lets change that and then look in air handler for a fuse that may be blown
Do you have a volt meter handy.
Check between RH and C and see if we have voltage.If not you will have to go under
THat is correct.Most newer units have a control board with a little 3 or 5 amp fuse.If you know or can get model on unit I can tell you where it is.
Generic picture of board
Remove fuse to see if blown
Next check transformer for 24v output.
You sure meter is set right? If only 7vac transformer is bad
Meter needs to be AC volts
OK we have to find where we are losing it.Lets see if it is leaving the air handler
Look for a fuse in red wire.If no fuse check between Red and Gray leaving air handler
I would reconnect with wire nuts. Also make sure there is not a float switch or condensate pump in circuit between furnace and thermostat that might be breaking circuit.
Update.The more I study the Sensi. I am thinking you may have been correct on the W/E
Most thermostats use W2 to energize heat strips as second stage heat (First stage being the heat pump).
So lets keep the White where it was.
Were you able to find a break anywhere in the circuit from air hander to tstat?
AS long as it is working leave it as it is.Most thermostats use W2 as second stage.