Serial G607B02799J

Hi we have this truck which intermittently stops the truck dead in its track and flashes the spanner light but no error codes.

Could anyone help with this either with a manual or look at what a flashing spanner symbol means without any codes preceding it please?

We tried connecting with yale etacc but that truck was not on the drop.down.menu list.

Then tried connecting to zapi unit using the handheld and came up chopper no ok, which will not allow my handset to work which is strange as i have plugged into similar trucks before using my zapi hand console.

Regards