Check the resistance readings of your heating wires.
To ensure that your floor heating system will function properly, always test the resistance of your wires with a digital multi-meter before, during and after installation prior to covering in thin-set or floor leveler.
Use the information contained on page 12 of the installation manual for details. If at any point during one of your tests the results do not match up with the numbers your Warmup manual indicates you should have, this indicates you have a short or a break in your wires.
Warmup can provide your installer with the tools needed to perform a repair when possible.