Indesit IDL500 dishwasher, 1st & 3rd lights are flashing, the filters have been cleaned throughly, but the problem is still there, does anyone know what the problem is please.

Marina 12147, June 2009

Blocker filter alarm
(the 1st and 3rd WASH CYCLE in
progress indicator lights flash).
• Switch off the machine by pressing the ON/OFF button and
clean the filters (see Maintenance), then switch the
dishwasher back on by pressing the same button. Re-
programme the machine and restart the wash cycle.

mando, June 2009