1. If the power supply needs to be disconnected, unscrew the electric heating tube box with a screwdriver and open it, and unplug the two wires of the copper tube with needle-nosed pliers.

2. press the cards at both ends of the copper tube with your hands, and then pull out the copper heat pipe.

3. Replace the new copper tube and wire it. The two wires can be interchanged out of order. Cover the electric heating tube box and tighten it.