Hotpoint WMFUG742 F06 fault nightmare

TomG1989

We have had the above model for around 8 months. It replaced a similar hotpoint model which was faulty after 1 month! We have been getting an F06 error intermittently and sometimes the cycle won't start at all, after the door lock has clicked several times. Hotpoint have been out 6 (SIX) times and replaced the door lock, the door lock wiring, the PCB and the motor brushes. Our next door neighbour is also having the same fault on a newly purchased Hotpoint washing machine. Hotpoint are now saying the fault can only be down to a 'mains frequency signal fault' or a 'mains power signal fault'. Electricity North West have no known issues and have suggested if there was a problem with the supply to the house, more appliances would be faulty. My electrician can find no faults. Where do I go from here?!