Hello, my system came with a heater that is controlled by a unit called jbj lighting digital heater controller. I was away a couple of days, just got back and doing the normal "checking in" on things and noticed the digital thermostat says "HI" and when I try to change the temp setting it remains in this "HI" reading. I grabbed a thermapen (a digital food thermometer) and used it to test the water and it read 79. My heater is normally set at 78. Does anyone know what would cause the "HI" reading on the display and how to fix it? I am concerned I will wake up to hot water and a dead reef tank! Thanks in advance.