UK Appliance Repair Questions? Ask a Technician for Answers ASAP
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Ok if the pump is clear and its empty when it flashes the 4 flashes then its more then likely the pressure switch in the sump base. As muck can get blocked in there so the switch doesn't release so the dishwasher thinks its not emptied the water when it actually has.
If you remove the bottom basket and take the filters out in the bottom and the bigger mesh filter.
Look inside the sump and on the right hand side wall you will see a black round grid. This is the pressure switch.
Pore some boiling water in there and with an old tooth brush give this a good scrub. But not to hard as it may damage the membrane in there.
Then retry the dishwasher and see how it goes from there.
If its still the same then the pressure switch will need to be replaced.
Let me know how it goes.