Product service provider liability: defective or nonconforming services and failures to warn can trigger consumer law claims. Product service provider liability arises when a service is faulty, deficient, or inadequate in quality, nature, or manner of performance as required by law or contract, when there is an act of omission, commission, negligence or conscious withholding of information causing harm, when adequate instructions or warnings were not issued to prevent harm, or when the service does not conform to an express warranty or contractual terms.