Trying to start a new cycle , will not move off initial pump out step . Very little water at bottom and does appear to be pumping out (poored a cup of water in) i have removed rotor cover and it is spinning freely . i have blown back down drain pipe(disconnected it at sink) and it was quite difficult , may be some obstruction , but i dragged dishwasher out (intergrated) and could not see a way of disconnecting drain hose from machine (goes inside ) Please advise ??