whirlpool adp5404 dishwasher starts then fails to rinse then empties?

This dishwasher lamp lights on initiation of switch, in rinse mode pump can be heard operating then the taking on of water. this is interrupted by the lamp now flashing at 7 pulses a time. and discharging the water to the waste pipe.

I cannot find anything physically wrong with the filter in the unit.
Using temperature positions on the control makes no difference to the problem.

removing the module from the door I have had intermittent operation of the machine operating correctly, I am assuming that an electrical fault exists.
having no flow chart and circuit for this machine, I am thinking the module has some relation to the malfunction being experienced. could you please point me to the area that I should be looking at.

kind regards
bob