Under HTM04-01 Part B the control of Legionella through thermal control is paramount. We identified poor hot water storage flow and return temperatures. As a result, the sentinel outlets failed to meet minimum guidance of 55°c degrees within one minute. We recommended undertaking a internal inspection and we identified the heat exchanger was heavilly scaled. As a short term solution we recommended weekly Legionella samples in accordance with current Guidance and undertaking an acid descale to remove any scale formation.