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To set the heater to maintain a certain temperature: Step 1: Turn the mode knob to the desired heat setting (wattage)
Step 2: Make sure the switch is in the Auto or AccuTemp™ mode and not the Manual mode.
Step 3: Press either the Temp Up or Temp Down button to set the digital thermostat to the desired temperature. The digital readout will flash while the temperature is set. After five seconds, the digital readout will change from showing what the set temperature is (flashing number) to the current temperature around the heater.