Have you attempted more than one card? This would confirm if the fault is with a particular customers card or the terminal.
Hold down the power button on the right-hand side of the terminal as below.
This will display a power panel. Press restart.
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Attempt a transaction for 1p to test.
When holding the card over the screen ensure that all 4 segments at the top are lit up before pulling the card away. If the card is taken away too quickly you will get a "card number not read properly" error.
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If the same issue persists please click on "Chat" on the bottom-right hand corner of the screen or e-mail techsupport@card-saver.co.uk for assistance