The Whirlpool WP2183400 Refrigerator Defrost Timer controls automatic defrost cycles to reduce frost buildup on the evaporator coils. It switches the refrigerator between cooling and defrost modes at scheduled intervals, allowing accumulated frost to melt before cooling resumes. This timed process supports proper airflow and consistent temperature regulation inside the refrigerator. B... https://www.partsmelange.ca/whirlpool-wp2183400-defrost-timer-for-refrigerator