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what device do you have in U1?
the U feeds power for a dehumidifier or humidifier.
The R handels 24 for heat and cool. Do you know where the blue wire goes?
the one u is to make power available for something else.
It is the "something else" we need to know. The current thermostat does heat. cool and...either humidifier or dehumidifier.
Once I know which I can direct further...and is there an issue with the current thermostat?
ok, here is the issue.
The new thermostat will work fine for heating and cooling...but it will not control whatever you have extra on U1.
So basically whatever the blue goes to...whether dehumidifier or humidifier..will not function.
Is there a fault with existing unit?
No it does not.
The final item is that whatever you have attached as an accessory...Which is on U1....there is no provision for that item in the new thermostat.
The new thermostat simply does not have an accesssory feature
I am sorry, I would love to help hook it up...but the existing system simply has one too many features for the wifi you have.
I wish you the best
please rate the service of the site and I will close this question. Have a great weekend