Whirlpool ADP951 modulogic - not working

Question

Hi there,
Have just moved into new house which has a whirlpool ADP951 modulogic. Can't get it to run. Seems to be connected correctly (water and power) but there is a red light/signal that is lit up. It's located on the front left hand side of the dishwasher and looks like a snow flake in design. Any suggestions greatly appreciated.

Jen