No. 1 – The card has been used already or the heads need cleaning
No. 3 – Area code has been tampered with – cannot fix
No. 5 – Something is stuck in the meter. Switch off at the mains and back on again. Should then feed whatever is stuck in the meter. If not then cannot fix.
No. 7 – Circuit Board blown – cannot fix
If the meter is eating the cards – switch off and on – if still doing it – broken cannot fix.