If it has been triggered then
You have to sort the cause of the blockage and fix it.
Now for the dishwasher:
There is a tray underneath the dishwasher to catch flood water. This is also the place where the flood sensor is. If you had a small flood that tray is now full of water.
You can either wait for it to dry
or
after putting down drop sheets, towels etc
Pull the dishwasher out and gently tip the dishwasher which will spill the trapped water over the floor.
You may have to do this a few times but eventually the remaining trapped water will be below the sensor and it should work.
Once that is done you can either wait until it
R
April 2007