Help Needed please! Customer with a Gledhill Boilermate and Potterton Suprima. Previous plumber had taken a rad off to tile bathroom and flooded the downstairs. Since then theyve had no heating or hot water. Went to have a look and when i switched the gledhill on the pump starts screaming. Also when boiler is switched it flashes red after about 10 seconds and locks out??? Any ideas please?!