It may be due to insufficient credit limit, broken POS machine, etc.

The reason why the CCB credit card cannot be used may be due to the following reasons: 1. Insufficient limit. If the cardholder's credit card limit is not enough for the transaction amount, the card swiping will fail. 2. The POS machine is broken. If there is sufficient credit in your credit card, the POS machine may be broken. 3. The credit card status is incorrect. If the cardholder's credit card is blocked by China Construction Bank, or the credit card is degaussed or the chip is damaged, then the card transaction will no longer be possible. 4. The credit card payment channel is incorrect. Credit cards include UnionPay, Visa, MasterCard and other brands. Cardholders need to swipe their cards at the corresponding POS machines when making purchases. For example, UnionPay cards must be swiped at POS machines with the UnionPay logo.

The limits of China Construction Bank credit cards are as follows: 1. For general credit cards, the limit is between RMB 3,000 and RMB 10,000. 2. Credit card gold card, the limit is between 10,000-50,000 yuan. 3. Credit card platinum card, with a limit of more than 50,000 yuan.