Whirlpool Duet washing machines use their electronic controls to display washer status messages and errors. The "F70" error is a communication error that could be a simple wire error or may require new parts.
The error could appear at the start of a load, during the middle or when the load completes. After the code appears, you cannot operate the washer anymore until it is repaired.
The "F70" error means that there is a failure from the central control unit. The error can be either from the user interface, central control unit or wiring.
Check that the wires have not disconnected or been exposed from the central control unit. If the wires are intact, check to see if the drum is rotating. If the washer drum is locked, the central control unit needs replacing. If the drum openly moves, the user interface needs replacing.
The washer must be unplugged before you work with wires. If you do not know anything about repairing washers, leave it untouched and contact a repair company.