I have an older 3D that the original controller failed. I bought a new controller which is the Gen 3. I have gone through all of the controller operating instructions with the elaborate flow charts. It explains how to change displayed temps or time but I cannot see how to switch between using timed or temp. It takes me 20 minutes hitting every combination of buttons until I accidentally get the "T" or "f" to change and cannot remember exactly what actually finally made it work. The old controller was logical and easy to program, but this one is going to drive me crazy. Can anyone please simply explain the steps to change between "T" ad "f"? Thank You for your help!