Using this door interlock switch is easy. First, make sure your washing machine is unplugged to avoid any electrical hazards. Then, locate the old switch in your front - loading washing machine and carefully remove it. Align the new switch with the mounting holes, which are 42mm apart, and secure it in place. Connect the wires to the 5 terminals marked 11, 14, 3, 4, 5. Once everything is connected, plug your washing machine back in and test it. When it comes to maintenance, keep the switch clean and dry. If you notice any signs of damage, like a broken terminal or frayed wires, replace the switch right away. Also, remember to always follow the safety instructions in your washing machine's manual. With proper use and care, this switch will serve you well for a long time.