Horstmann HRT4 ZW with Fibaro

Is it someone who has experience with Horstmann hrt4-zw, I have included him in Vera but struggles to pair him with a Fibaro switch. I’ve tried to add Fibaro to group id 1 and / or 2 but it never gets “high” when there are discrepancies between setpoint and measured temp.
And the thermostat is always on the “heat off”
Appreciate the input that anyone can come by.