It is located at the top rear of the unit. WARNING: During any service of this appliance, the power to the unit must be turned off. It is not acceptable to use the “On/Off” switch to meet this requirement. l o Heater Control Flame Control On/Off Switch Fig. 4 HES80 controls. The heater control acts to turn the heater on and off as well as setting the comfort level in the room. Turning the knob clockwise from the off position will place the heater into operation. The further the knob is rotated c