the tacho is the wire type device that sits ontop or above the motor, (it measures how many revolutions the drum is doing) is your machine stopping at some point just after washing, before doing a spin, or rinse?
i think it's something to do with the magnets that attach to the tacho, they either come loose, or dont connect properly, which is why it reads 'error'
the tacho cant read the drum properly, so it sends signals to the drum incorrectly, so it spins erratic, then stops, and errors.
well, thats what happened to mine anyway
hope this is of some help
sharon, March 2010