Hotpoint Aquarius WD440 tripping electrics?

We have had our WD440 washer dryer for a little over a year. We put a wash on and came back to the house later in the day to find the ground floor ring main had tripped out. Eventually tracked it down to the spur supplying the washing machine. Every time we switch this spur on the 'wash' light and the on light switch on for a second or so before the electrics trip out again. I have seen a comment about a faulty door lock from someone else. Is this likely? Can I replace this fairly easily without resorting to Hotpoints £90 charge?