Does the heater have one black and one white coming from it?
Just want to make sure I understand.
Ok, got that....
I thought maybe you could tell which wires were being routed from the heater and which ones from the power supply.
If not,, connect one black to L1 and one white to L2 connect the other black to T1 and the other white to T2.
That should make it work if the heat element is OK.
Let me know how it works out.
After drawing it out...I think either way should have worked. If you connected the two blacks to L and the two whites to T and it didn't trip the breaker then you probably have a bad heat element.
Do you have a volt meter?