Place potatoes, carrots and onion in a 5-qt. slow cooker. In a large skillet, brown beef in butter. Transfer beef to slow cooker with a slotted spoon. Stir flour into the pan drippings until blended; cook and stir until browned. Gradually add water. Bring to a boil; cook and stir for 2 minutes or until thickened. Add salt, parsley, celery seed, thyme and pepper; pour over beef. Cover and cook on low for 8-9 hours or until meat and vegetables are tender.