The unit indicates that it is working. Batteries are good. Circuit breaker is too. But no heat!

Any suggestions before I call Brivis-guy?

If you have batteries in your thermostat, the thermostat can be powered from the batteries but the furnace or fan coil unit(blower section) may have lost low voltage or line voltage power to keep the system from working. You need to start with checking for voltage at your blower section. Check all breakers.