I had one similar to that once.....
for no apparent reason it stopped pumping...all seemed fine inside...and still wouldn't pump out....
turned out not to be the pump, but was the by-pass valve for the self clean filter got stuck open...the water would just recirculate back into the machine....took a while to investigate that one, especially after replacing with a new pump and it still wouldn't pump out...
but yeah, if you got it to work, dont question it, keep running it and enjoy!