Hotpoint washing machine – when is an F03 error not an F03 error?

I am working on a Hotpoint NSWM743UGGUK (869991581710 sn:562007027156) washing machine. I have already replaced the element and the element NTC sensor for new parts. This is the sequence of events on the “cottons” program:
1) starts by draining then filling the drum to about 2″ off the bottom of cylinder
2) then pauses for a minute
3) then start rotating the drum for 2 cycles clockwise, 2 cycles counter clockwise, for a few minutes
4) the heater comes on and draws approx 1800 watts
5) with the heater on the machine continues with 2 cycles clockwise, 2 cycles counter clockwise for 6 minutes
6) the machine stops, drains, and displays error code F03.

As I said, I replaced the NTC, and the element. Before I buy any more parts does anyone have an idea?

Thanks,
Mark