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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Complex Repairs: For complex issues involving electronic control boards or internal components, a professional appliance repair service is recommended.
Source: https://dodbuzz.com/mastering-refrigerator-maintenance/
Next, the electronic control unit actuates an oil control valve which in turn manipulates a pulley controlling the valves on top of each cylinder.
Source: https://www.slashgear.com/1430596/honda-v-tec-vs-toyota-vvt-i/