Not sure what you are doing!
Test
Just set the temp to 28
heat up the sensor , on the left below you can see it between the cooling rib.
If temp goes above 28 then you can hear the relays click
Then cool of the sensor and you can hear the relays click again.
I have not installed the thermostat yet on my Hvac system, will do that if I have my driver ready.
Robert will connect this afternoon.
<hr noshade size="1"><font size="1">Pieter Knuvers
http://www.bwired.nl <i>Online House in the netherlands. Domotica, Home Automation.</i></font id="size1">