Error messages on your prepay meter can show because of a faulty card or key, or due to an issue with the meter itself.
If the message disappears, then it may be that there's a problem with the card or key itself. Try wiping it with a damp (not wet) cloth to remove any debris that may be stopping the device from working, and reinsert it into the meter.
If there's still an error message even after you've removed your card or key, it could be an issue with the meter. If that's the case, please email us at firstname.lastname@example.org or call us on 0131 516 4429 and we’ll be able to help.