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A wiring harness is an organized set of wires, connectors, and terminals that transmits electrical signals and power throughout a boiler or burner system. It simplifies installation and maintenance by bundling multiple circuits into a single assembly, reducing the risk of loose connections or short circuits. In heating equipment, the wiring harness connects key components such as the control board, sensors, igniters, and valves, ensuring reliable communication and operation. When replacing a faulty harness, it is important to select the correct configuration for your specific model to avoid compatibility issues. This part is vital for safe and efficient electrical system performance.