Automated teller machines are designed to complete transactions quickly, but sometimes the screen displays an error message instead of dispensing cash or processing a deposit.
These messages usually appear when the ATM cannot verify the transaction, the bank declines the request, or the machine experiences a communication problem with the banking network.
This guide explains common ATM error messages, why they occur, and what people typically do when a transaction does not complete successfully.
Why ATM Error Messages Appear
When someone inserts a debit card into an ATM, the machine sends a request through a banking network to the card-issuing bank. The bank verifies the card, checks the account balance, confirms the PIN, and reviews security systems before approving the transaction.
If any part of this process fails or cannot be verified, the ATM may display an error message. These messages are often related to bank authorization systems, network communication issues, or security checks designed to protect the account.
Some of these issues are connected to the same systems that power mobile banking apps and digital transfers. If you want to better understand how these systems work behind the scenes, this guide explains how online banking works and why transactions are sometimes delayed or declined.
Common ATM Error Messages
While error messages vary by bank and ATM manufacturer, several types appear frequently across different machines.
Transaction Declined
This message usually appears when the bank declines the request due to account limits, security checks, or insufficient funds. Learn more about ATM declined transactions.
Invalid Card
An ATM may display an invalid card message if the card cannot be read properly, has expired, or is not supported by the machine. See ATM invalid card errors for more details.
Wrong PIN
Entering the incorrect personal identification number may trigger a security warning. Multiple incorrect attempts can cause the ATM to cancel the transaction or retain the card. Learn more about ATM wrong PIN errors.
Unable to Process Transaction
This message usually indicates a communication issue between the ATM and the banking network or a temporary system error.
Network Error
ATMs rely on secure connections to banking networks. If the connection fails, the machine may show a network error and cancel the transaction.
ATM Error Messages Related to Withdrawals
Some ATM error messages appear during withdrawal attempts. For example, the machine may display an error if the withdrawal limit has been reached, if the bank declines the transaction, or if the ATM runs out of cash.
In some situations the account may show a pending transaction even though cash was not dispensed. If this happens, see our guide to ATM withdrawals showing as pending.
ATM Error Messages During Deposits
Deposit transactions can also produce error messages. Machines may reject deposits if bills cannot be verified, if the deposit exceeds machine limits, or if the ATM experiences a counting error.
If a deposit does not appear in your account immediately, you may want to review:
What to Do When an ATM Shows an Error
If an ATM displays an error message, the most important step is to review the transaction receipt or confirmation message on the screen. In many cases the transaction was simply declined and no funds were moved.
If the ATM retained a card or charged the account incorrectly, customers typically contact their bank or financial institution to review the transaction and request assistance.
Understanding ATM Error Messages
ATM error messages are usually generated by bank authorization systems, network communication failures, or machine security controls. While these messages can be confusing, they are designed to prevent unauthorized access and protect customer accounts.
Understanding what these messages mean can make it easier to determine why a transaction failed and what steps are typically taken when an ATM does not complete a request.