OK, so major progress but sadly no go.

I checked the connector and rung out the wires from the cannon plug back to the RJ45 connector (but has 10 across, not 8). All looks OK.

I then found something that explains the issues, a loose wire inside the motor. Joy of joys, would explain why the encoder doesnt work properly and why the motor heat error is needing to be masked.

So soldered it back together, sadly no change.

I did figure out how to do the the Op = 2 run again, its all in the sequence. It trips out on an encoder error. I dont remember if it did this before or not as I was getting the over temp error but I think it did the same.

Its as if the encoder is simply not working. I can see no indication of a pulse or movement.

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The manual refers to checking system parameters E04 but I dont know where / what that is. It does then talk about Parameter 14_1 onwards which are for the encoder, so must be related.

Ive tried to remove the encoder to see if all wires are there but struggling to get the rear case open.