The highflow boilers are prone to blockages. Usually the hydraulic assembly on the left hand side, the top amnifild, bottom manifold, some of the later ones had a filter on the cold mains feed.
What I'd do hear, which BG keep quiet is that you can insist on a manufacturers visit. If Worcester...
HI,
Our Creda washing machine is tripping our circuit breaker when plugged in. It was just filling with water then power went to ground floor.
I'm am part P qualified, although proficient in boilers and heating systems, not very experienced with washing machines.
Any ideas on any fault...