I have an odd problem with an Ikea/Whirlpool DWF415 (854541515710) dishwasher. The machine switches on and does the initial pump out ok, then as soon as it starts to fill the drain pump cycles on and off at about one second intervals along with the start button light. This has been an intermitant problem for some time but has now become a permanant problem. On the initial visit I did all the usual checks and found no faults. The machine then completed two wash cycles with out a problem before reverting back to its original condition. Anyone have any ideas?