We may have found other answers which could help you.
Click here for Cleaned Water PowerFisher and paykel DW820 beeps after rinse cycle?
New seal on our dishwasher ?
U3 error in Fisher & Paykel DD601v2?
My fisher and Paykel dishwasher DW820 is not fully drained ?
How can I fix my DW820 ?
How to get the rest of the rotor assembly out its broken from the shaft ?