Active job

Heat Transfer System - repair

I have a heat transfer system (ultecon controller), ducts go into x3 other rooms, and for some reason it's not kicking in when it reaches the right temperature. Not too sure if it's a thermostat issue or not. Fan is not working, but room temperature does display and increases/decreases. Have had no issues in about the 10yrs have been living here. Would be great if someone could look at this asap.