When the furnace has been using for quite a long time, if it is discovered that the heating current cannot be increased even though the heating power knob is adjusted clockwise to the limit.
在电炉使用相当长时间后，如发顺时针方向调节加热功率调节钮至最大位置，加热电流仍上不去。
Connect the power supply, turn the regulator knob clockwise, and the indicating lamp is lit, then it is ready for heating.
插上电源线插头，顺时针扭转调理温度旋钮，加热指示灯亮，即可进行加热。
Connect the power supply, turn the regulator knob clockwise, and the indicating lamp is lit, then it is ready for heating.
插上电源线插头，顺时针扭转调理温度旋钮，加热指示灯亮，即可进行加热。
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