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Are you saying BLACK to W2 and blue to C?
And please provide model on the new thermosat
Looking up manual,be right with you
In setup menu, do you have HP selected on the Norm/HP switch?
Make sure since we have a wire to both W and W2 you have selected d. See below:
If you can look in air handler and see if the black and white go to same place, you can put them both to W on thermostat and select C as they are just requesting elements in both aux and emer mode. If the go to different places in air handler, leave them on W and W2.
The aux is telling us that both the heat pump and aux heat are on working together.When temp you are asking for is within 3 degrees of actual room temp, the AUX should go away and elements turn off.
Lets try this. Disconnect the tan wire from thermostat.Move the white wire over to W2 and see what happens.
Might if you can show wiring at air handler.
Not much help.I can not see the wiring terminal letters .I am going to open this to other experts who mayhave more ideas.I have opted out of the question to see if perhaps other experts may have more information and can assist.Please do not rate or reply as that will send question back to my desk.Please stand by to see if another expert can assist further.If no expert is able to assist we can request a refund of your deposit