How to use the temp setting?
Temp Setting:
Press the button on the controller over and over, the set temp digits will go circularly from 61 to 90, when you set it to the digit you want, stop and wait the led flashing for 3 times, then the setting is done and the led will go on displaying the water temp.
Heating indicator light
There are 2 indicator lights below the display screen, the left light will on red when the heater is heating, the right light will on green when it stops heating.
Over temperature protection.
The fish tank heater will auto shut off if water temp is over 97℉, and will automatically turn normal work when water temp is less than 95℉.