Fisher & Paykel EcoSmart won't get message to rinse?

My F&P is not getting the signal to rinse in the rinse cycle. It recycles whatever water it has (maybe a cup or two) and then stops, tries to think about what to do next, and then tries to rinse again. Both the hot and cold water valves allow water to go through in the wash cycle, which works fine. What is the reason for this problem? I'm thinking it might be a circuit board issue not sending a proper signal but don't know. Any help would be appreciated of what the problem is and how I might fix it. Thank you.