Further to my previous message I am pleased to say that the flush system is now working again. Thanks to the excellent advice from Tony McLean (posted in June 2009) I removed the pump from the tank and found that the impeller was working normally, so I turned the pump upside down, then placed it in a jug of water and it immediately primed. Put everything back in place,filled up the tank and it operates normally. Still don't know the cause of the problem, can only suppose that there was an air-lock. Thanks Tony
Derrick, July 2010
