The fire in the roof space was considered to have been caused by a malfunction in the fan motor component of a heat transfer system. A consequential audit of the fan unit component found that the fan component did not meet the requirements of a medium risk article when originally sold. The heat transfer system supplier was advised to have the heat transfer system evaluated by a recognised testing laboratory to determine the level of risk that may be present with the heat transfer systems already installed in New Zealand. Energy Safety will make further enquiries with the importer of the non compliant fan units that are listed medium risk articles, to determine what further action is appropriate.