Conducted research on web, and via direct contact with AppliancePros where a diagnosis of replacing the water inlet valve and cleaning the sensor tube would "most probably" (80%) handle the issue. The remaining uncertainty would reside in the electronic board circuitry. The price of replacing the water inlet valve was half of a local repair call just to diagnose the issue so I decided to have faith in the odds presented to me. The part arrived on time, and using AppliancePros advice and on-line video, it was easy to replace and only took about 10 minutes. All is working fine now.