I have an electric Bryan Model ck5bxa042000aaa. The unit has stopped blowing hot air when set on heat(digital thermostat). When I turn the thermostat off it just continue to blow air. Any help would be greatly appreciated.

If this is a inside electric heater usually one of the heat sequencers controls the blower. It could also be a relay. The circuit will need to be tracked down to find the ofending component. Wiring diagram is posted on the back side of the blower access door.