Shimano EP8 stops working while riding - no fault in log?

[Ted3]

Mine look like carbon not metal. But if bike shuts off 5 times, cleaning with rubbing alcohol will reduce it to 2 times

I have 2 or 4 round pins.

No motor and new battery and new Rosenberger cable, still shuts off

The 2 bigger pins of EP801 are silver-colored when new/free of oxidation.

I noticed that contact cleaner doesn't really help (at least alone), but 5-10 mins of electric toothbrushing and the pin looks like a new again.

For some reason only the right upper pin turns to gold (=gets oxidized).

Your climate is much hotter than mine (I don't usually do long rides when it's over 25C/77F), but in your case the thermal shut down perhaps happens even if the pin isn't visibly oxidized ?

But the first thing I would do is make sure the two pins are clean (silver-colored), and maybe try applying an anti-oxidation paste on them.

 

[Winford]

The 2 bigger pins of EP801 are silver-colored when new/free of oxidation.

On the motor they look carbon, the Rosenberger yes are silver

 

[Ted3]

On the motor they look carbon, the Rosenberger yes are silver

That's weird, could you upload a photo ?
Should look like this:

 

[aFox]

Thanks for this additional information - however, as written before, please create and post the requested service report!
If you are not willing to do so, (at least) I will not be willing to assist further in this issue. You also can connect the (new, "defective") DU-EP800 drive unit solely (without any other components) to your SM-PCE02 interface and create this requested service report - in this case, the drive unit will be solely powered from your computer via the interface.

There it is now. That error code came when testing without speed sensor.

 

[Winford]

Should look like this:

Nope mine are black and look like they are carbon.

 

[Backflip]

There it is now. That error code came when testing without speed sensor.

Sorry for the delayed answer - unfortunately I did not get any notification of your post and just saw your reply today.
So this DU-EP800 drive unit with production number 7HCUIG668DF is from March 2009 and only has a mileage of 592km.
Sure, the W10100 warning wíll be triggered when there is no signal from the speed sensor detected from the drive unit (DU-EP800). In this case there will be no or only little motor support given (see also here):

Maybe also the previous owner has deleted all relevant errors which is easily possible with the cable-bound PCE - interface and the Windows based E-Tube-Project-Professional software.
What exactly has the previous owner of this "defective" DU-EP800 drive unit told you about the "defect"?
As written before already, I am very sure that this issue has nothing to do with the motor firmware. However, if you want to downgrade to a previous motor firmware version urgently you can use an Android smartphone and use this document. If you want to process the downgrade via the PCE - interface, then just send an email to the guys from eMax-Tuning and they will help you.

 

[Ted3]

Nope mine are black and look like they are carbon.

This means there are different revisions of EP801 where the pin coating differs ?