The vast majority of the time a E09 would suggest the heating element has failed, unfortunately unlike in washing machines the element isnt sold separately, its integrated into the pump, a replacement element\pump is around £140 from online stores such as here.
In terms of troubleshooting they all require stripping the appliance down to see if the element is open circuit, your getting voltage to the heating element terminals during the cycle, and then checking the thermostat is operational.
Its a rather complex job to get to the heater pump to test it as you have to dismantle the sump. To have an engineer to come out and do this for you, it would cost best part of £50, so your approaching the cost of a new machine when you consider the cost of parts.
Please let me know if you would like me to recommend a engineer in your area to come and replace the heater pump.
If the seller didnt make adequate provision to remove water before transport, it would make me wonder if they had fully tested it (and checked the water gets hot, and completes a full circle, rather than running it on a rinse).
The water would be unlikely to have caused damage to the element, it may well be a lose wire \ connection, but again require stripping the unit down to check, but during transport the wire may have come lose.
From experience this fault is most likely to be a faulty element.
I havent heard back from you in the last few days, and just wanted to check if you still require assistance, I would appreciate it if you could rate the service received.
I havent heard back from you in the last day or so, and just wanted to check if you still require assistance, I would appreciate it if you could rate the service received.