1. Determine the mode: Hold down the SET grimdeath approximately 5 seconds will show PO Press again SET will display mode. Press + - switching mode H is the heating mode C is the the cooling mode. 2. Set Backlash: Return difference is to set the temperature to fall how much to start again after stopping the the default is 2 if you need to modify press and hold SET grimdeath approximately 5 seconds will show PO. Press + - Switch to P1 Press again SET display the difference between the back to the press + - to set back to the the difference between the on it. 3. Set the temperature: Mode and differential back to the Later setting the press ENT to confirm a direct returned the screen display real-time temperature. Press once SET screen flashes directly press + - to set the desired temperature on it.