The machine cannot read the debit card; card reader errors mean that the card reader either needs to be replaced or cleaned. Card reader errors do not always indicate a defective reader, there may be an obstruction in the card reader. Frequent use, dirt buildup, or spilled drinks may also affect the card reader.
Bills may sometimes jam in the machine and have to be removed. Clear the bill dispenser of ripped bills and reset the machine
Make sure your ATM has enough paper to print receipts by replacing the roll. ATM mistakes are relatively rare but when they do occur, ATM users need a printed receipt that shows the time and date of the transaction in order to get the problem corrected.