How can I fix my Hotpoint Ultima WT965 - F05 Fault Code?

My washing machine has the F05 code flashing on it, I am aware that this means the pressure switch is jammed. I've drained it and it works for half a cycle then stops again, please can someone help me, I'm going on holiday soon so have next to no money and need to fix it. Thank you anyone who spares their time to advise me.