1, the card reader is broken. Try another card reader.

2. Credit card information cannot be read. At present, the popular credit cards are magnetic stripe cards and chip cards, which involve the invalidation of magnetic stripe and chip. When a general credit card is used for a long time, the magnetic stripe and chip may be invalid, and the invalid credit card information cannot be read, resulting in the abnormality of the credit card. In this case, the cardholder can only ask the issuing bank to change the card, and generally needs to bear a certain card replacement fee.

3. Credit card payment is limited. There are many reasons why credit card payment is limited, including the amount of credit card payment exceeds the single/current/current limit, the credit card limit is insufficient, and the credit card is frozen. In this case, the credit card can only be swiped after solving the influencing factors according to specific reasons.

4. Abnormal credit card transaction: The bank will monitor and identify credit card swiping and payment, and will temporarily freeze the credit card once the transaction is abnormal.

5. If the credit card status is normal, then the reason is that the credit card machine is faulty or the credit card cannot be read.