I just recently bought a chest freezer and have been trying to hook up my Johnson temperature controller to it but no such luck. When I plug the freezer in to the wall it cuts on but when I plug the temp controller into the wall and the freezer into the controller, the freezer never cuts on. The temp controllers display is on and I can change my set temperature and everything. The freezer just never starts up, and the temp never drops. What am I doing wrong?