does it go through the cycle but without putting water in, or does it start the cycle and then just sit there doing nothing? if it sits doing nothing, check the water supply from the initial tap through to the fill solenoid and pipework afterwards for any kinks or blockages. youd do wise checking the solenoid itself for continuety on the coil.
if it goes through the complete cycles without water in the drum, then its more likely to be the pressure switch, if this is the vase, theres a chance the drum element may have blown also.
tony
January 2009