Hi,
It can be a number of things.
1. Check all wiring inside for breakage to the insulation, arcing can occur if two wires are broke at the same point.
2 Where the heater connects to the wiring loom, I have known the spade connectors to melt and become corroded again the wiring can arc .
3. Run the machine with no water in to ensure that it is not leaking through either the freshwater tank or the waste tank.
4. I wouldn't bother with Ashby's your machine will disappear into a customer service black hole and you'll br quiet until the new year, through lack of machine
Someone who knows electrics should be able to sort it.
Regards
Graham