My old saniflo packed up last week and I replaced it with a new one (it was pretty old). Less than 24 hours after the new one was fitted it stopped working. It makes a whirring noise constantly and doesn't empty the toilet bowl. I have turned it off at the electricity supply so it doesn't burn itself out. Is the problem with the saniflo itself or might there be a problem with the pipes? It had hardly been used. I have an engineer coming out tomorrow but it is my only toilet so am having to stay at friends' houses.