Whirlpool AWO/D5526 (859234315200) problem?

Hi,
I wonder if anybody could second my diagnosis of our fault.

The machine doesn't appear to be filling to the normal level. I've check the inlet valves and the solenoid's pass continuity test, the water pressure is fine, and water is entering the dispenser ok.

I think it could be the sensor, if that isn't working properly it could be over heating (due to less water in the drum) and could cause further problems.

What do you think? Thanks.