I agree with tgoods,
F70 = CENTRAL CONTROL UNIT HEARTBEAT FAILURE
If a Central Control Unit Heartbeat Failure is displayed, no communication is detected from the Central Control Unit to the User Interface.
1. Check for continuity of the User Interface harness.
2. Check wire harness connections to the User Interface and the Central Control Unit.
3. If the drum is not rotating, unplug the MCU from the CCU
(the MI3 or M13 connector). If the code disappears, replace the MCU. If the code does not disappear, replace the CCU.
4. Replace User Interface if drum is rotating.
I have attached a copy of the tech sheet.