Old post. The most common problem with E03 when IT ISN`T a failed pump or blockage is strangely the wash heater to earth ( which it probably will not take out the trip ) which back feeds to the pcb and typically causes the machine to fail on any of the rinse programmes leaving the machine in a half pumped out machine state flashing up E03. Unless you have a megga tester your floundering and yes, the heater terminal to terminal would read that but it is terminal to earth you need to test and a normal test meter, unless lucky, will not show anything is amiss. For the price of a new element just order one fit it and try it. Very common on Hoover and Candy machines that the element goes to earth and causes the described problem.