ck - many thanks
I checked the filter it was clear except for a small blood sample strip that my wife uses, impeller was free to turn. Couldn't check the ohms without a tester. Prewash light still flashed.
But, next, I pressed and held in the two buttons(with a lock sign linking them), next to the "cancel,pause, hold 3 secs" button, and abracadabra the prewash light stopped flashing, and the machine is presently chugging away happily with a wash load inside. Cheers.
keith, June 2010