The majority of flashing light problems are to do with the build up of sludge.
Clean all the filter and pump fittings in the bottom of the machine.
Remove the bottom section of the door (8 screws)and clean the bottom drain gutter thoroughly.
Under the machine from the front(tilt the machine backwards) remove the metal plates (3 screws) and check the plastic drain container. (If there is water, empty and clean it)
Next to the drain there is a white filter that has water tubes attached to it. Remove it (pull it out) remove the tubes and empty the contents as is often full of sludge which prevents the water pressure from turning on the pressure sensor valve to operate the heater element.
Sludge is the enemy, make sure you regularly clean the machine using a recommended product.
Dennis
September 2012