Hi Clay! Congrats on the 3D!
You got one from the first batch of D models. What you are getting is the "high temperature" alarm (default program is 290). This is a program that can be set differently.
Press, and hold, the "SET" button until "Lck" is in the left window. Then, use the "+" button to dial-in 188 in the right window. Press SET again. You will see AH1, in the left window. Dial in 375 in the right window, with the + button. Now, cycle through the rest of the settings, using the SET button, and you'll be good to go!
There was confusion, on the high-temp alarm setting on the first run of the D models. This will fix your issue!