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Check for proper water level, pressure and temperature. Ensure the detergent dispenser, spray arms and different valves are working correctly. Verify that the inlet and drain valves have the proper continuity and resistance.
Clean the fine particle filter and water inlet filters. Make sure none of the valves or hoses have blockages. You should also inspect the selector switch, timer motor and heating element for the correct continuity. Test the bimetal terminal assembly last.