Surely the simplest thing is to read the manual?
Salt filling:
https://service.hoover.co.uk/media/4pzouo32/hed6612-pdf.pdf
Read page 4 (and the rest of the manual)
As for tripping the electric, it sounds like there is a sudden fault. Probably the water heater element but possibly a leak into the base of the machine.
Are any control panel lights flashing or brightening and dimming? See page 13 of the manual.
did that help
June 2020
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