Yuba generally has three switches, two of which control heating, and one that controls the lighting. In fact, just the wire from the outside is not guaranteed to be correct, and it will burn the line if it is not good. Need to open it, here to note that some brands of Yuba need to remove the light to open. If the Yuba wiring is wrong, the following problems will generally occur. Once opened, the lighting module, the heating module, and the exhaust module are opened together. If this is the case, use one. The power supply line actually has three lines: 1. The ground wire, the yellow and green one, is above the bathroom on the socket and is connected to the outer shell of the Yuba. 2, the zero line, most of the time is blue or black, on the left side of the socket on the socket, the connection is connected to the screw of the five lamp holders. 3. The firewire, in most cases red, is located on the lower right side of the socket and is connected to one of the three switches. The three switches, the one that illuminates the tube, the other is connected to the center of the illuminating head; the two tubes are heated, and the other of the two columns is connected to the center of the two heating heads. The Yuba terminal block is marked with N in the 0, the other four have two warm lights, one for ventilation, one for lighting, the other four to the switch control button, and the other one to the switch, it is necessary to pay attention to the color of the line. Find out. The position of the Yuba pressure line. There is a wiring diagram on the top. If you can't understand it, you can find an electrician to stabilize it. This is a bit complicated, because the control switch L1 of several lines is connected with the socket L when it is bought. When the red line enters, the socket colleague also picks up the fire line, the other hole of the socket is connected to zero, and the other end of the switch is connected to the light. Tube Expander ,Manifold Gauges,Heavy Duty Charging Hose,Ac Vacuum Pump LONG TERM ELEC. CO., LTD , https://www.longterm-hvac.com