Open top of washer and at right side there is an white plastic``envelope´´ inside this is the control pcb
(mainboard) take this out and cleen pcb.
Spay all connectors with contact cleen spray then
contact oil after some while.
This black dirt on control pcb comes from brush´es
on main (drum) motor, check them allso ! they might be warnout, its eazy to replace during service.
piff
December 2008