hotpoint aquarius wd71, washer/dryer?

Hi,

Hoping someone can spare me a bit of there time and hopefully expertise. I am getting an E15 error code ( outlet pipe not taking water away) on the above machine. I have thoroughly cleaned all pipework, filters, pump sump and impeller. After cleaning the impeller parts and the magnet behind this (small amount of rust ) it did one wash clearing the water before then not clearing water on the second wash. After a further inspection of the pump I again got one good wash before the second wash again did not take the water away.
Is it possible that somehow the magnet on the outlet pump is not holding a very good charge?
Any ideas much appreciated.