What does fault code 51 mean - Fisher and Paykel Fisher & Paykel Washer

Our washer did the same but it was after I took the excess drain hose and pushed it into the drain in the wall. I thought it looked "more tidy" In doing so I created a siphon effect. Once I pulled the excess hose back out it was fine.

Error code 51 usually means a faulty diverter valve. Try and run a wash cycle, and observe the drain hose. If water comes out, the diverter valve should be fine, if no water comes out you should take your diverter valve out and check for debris, or continue to read through the following possibilities of why your washing machine is acting up, and the actions to take.

1. Diverter valve
Action - Check diverter valve continuity. If open circuit, replace diverter valve.

2. Motor Controller Board (drive circuitry blown).
Action - Replace Motor Controller Board
3. Diverter valve harness/connectors.
Action - Replace wiring harness