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An expansion valve coil is an electromechanical component that controls the opening of the expansion valve in response to temperature or pressure changes. In heating systems, this coil works with the valve body to regulate refrigerant flow, directly impacting system efficiency and comfort. When the coil fails, the valve may not operate correctly, leading to improper heating or cooling. Replacing the expansion valve coil is a common repair task for boiler and burner technicians, as it restores precise control over the refrigeration cycle. This spare part is crucial for maintaining optimal performance in heat pumps and other heating equipment.