I have just upgraded to the hive dual wax heater and have set my working temperatures for both wax pots however want to lower one of them. I can press up or down on the control but it won’t go lower than my preset working temperature. How do I reset this? Surely there must be a way as people will alternate between hot and warm wax but the instructions manual gives no guidance. Turning it off and trying to set it all again doesn’t work. Has anyone else had this problem? Or is mine faulty?