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
1. Check for continuity of the User Interface harness.
2. Check wire harness connections to the User Interface and
the Central Control Unit.
3. Replace User Interface if drum is rotating.
4. Replace Central Control Unit if drum is not moving.
I'm including a link to the service tech manuals to this. http://www.servicematters.com/docs/wiring/wiring_main.htm this will help you test the unit. it appears though your central control unit is failty, thanks Bryan