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3) Press the timer-on button again, and the set up is cancelled. 4) If the on/off button is pressed while the unit is under the timer on setting, the unit will start immediately. The timer setting is at that point cancelled. Timer-Off Switch 1) When the heater is on, press the timer-on button to set time for the timer-on switch. Press the button once to change the time interval of 1 hour in a cyclic manner of 1,2,...24,1,2 (The display shows the previous time as the starting time of the present