This generally means that the PIN number was attempted too many times. It is a security function that prevents someone from trying to use an ATM card and guess time after time, at the PIN, hoping to get it right. After a preset number of entries the card may either be held by the machine or "swipe-type" card readers may refuse further transfers.|
By the way, a four-digit numeric PIN has 10,000 possible combinations. Please, memorize your PIN, do not write it on the card or even keep it with the card in your wallet or purse.
Published on BankingQuestions.com 1/26/07