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Hello. When the toilet is flushed the macerator works properly but it after it has finished churning it doesn't turn off. The macerator stops but there is a noise that sounds as if the electric supply keeps on. I turn the electric supply off for it to stop. Sometimes I try it by temporarily turning the electric switch on and it works normally, but it is has been faulty the last time it was used. Any ideas as to how to fix it please?