I've got a TS100 that I rarely use that someone can borrow...Requesting a megger to test your floor is the next step in the process to letting you know you're screwed. If it is anything like the fiasco I went thru, the next step will be rental of their line fault detection box. This was/is a joke. If you are so lucky as to actually find a break in a wire you can request a repair kit, fix the wire, and replace a couple of tiles. Even if you could do this it - VOIDS the manufacturers warranty!!! I was not able to detect a break and had to replace the entire floor. Good luck.
In their defense ,though, I had the floor and heater (same brand) replaced by a great tile installer and it is working fine still today. It all comes down to the installation.