Washing machine drains but does not spin (Hotpoint WF321)?

We have an Hotpoint Aquarius WF321 1200 Spin. The past couple of days, whatever program we set it on, the on light comes on then flashes intermittently and the 'rinse hold' and 'mini load' lights come on and also flash intermittently. The drum does not spin but water starts flowing into the drain outside. The drum does not fill up. Whatever we press on the machine this cannot be stopped and goes on for about 5 minutes. Then it stops. What is wrong?

I have checked that there is no blockage in the pump (as specified in the manual).