In message , simon
writes
Currently using a monthly Oyster with no pre pay on it.

Everytime I touch it on entry,
the gate opens,
seek assistance is displayed,
code 70 appears on bottom left corner.

The ticket is correct in terms of zone validity, anyone know what a "Code 70
" is ?

Unspecified Oystercard Processing Error/Unspecified Card Presentation
Error.
Make sure you place your card flat on the reader and don't slide it
around.
I've noticed that 70 and 94 sometimes come up if the card is either
hovered over or moved about on the reader.
--
Kat Me, Ambivalent? Well, yes and no.