What is the error code E90 on Zanussi FJS1425w?

Water was not being pumped away on a spin program for a Zanussi FJS1425w. Drum wouldn't turn during the program until water had been removed at machine drain flap. Found blockage in drain hose and in plumbing plastic drain pipe underneath sink. Cleared blockage, tried to test and see if water would be pumped away to the drain. Power button light coming on OK. Getting above error code flashing and alarm beeping. Pressing program buttons doesn't do anything. Pressing hold button does not work, and door is locked longer than normal before being able to open.