F70 is "Central control unit heart beat failure" No communication is detected from the Central Control Unit to the User Interface. (In english, this means that the controler unit mounted in the bottom of the machine, probably in a plastic cover, has stopped talking to the control panel on the front of the machine where you push the buttons).
You need to take the top off the machine and check that the wiring harness between the 2 units is intact and that the plugs on the ends of the harness are firmly in place on both the Central Control Unit and the User Interface. If this fails to fix the problem, then the action indicated is that if the drum is rotating while this error is showing, the user interface is faulty and requires replacement. If the drum is NOT rotating while displaying this error, then the Central Control Unit should be replaced.
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