To manually restart a Duraflame infared heater, first turn off the power supply and disconnect the unit from the wall socket for 5 minutes. After 5 minutes, plug the unit back into the wall socket, and it should operate as normal. If this doesn't work, you can perform a Master Reset. To do so, turn off and disconnect the unit from the wall socket. Then, press and hold down the main power button on the unit itself. Continue to hold down the button while plugging unit back in, and once it is plugged back in, continue to hold the button down for 5 seconds and then release. Your heater should then operate as normal.
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