E1 is just operator error, it normally occurs when the wrong keys are
pressed or the machine has got itself into a bit of a loop. At exactly
which point does the message appear? is it when you press a certain key?
The first thing to try is an initial clear:
Turn the key to P
Press and hold SUBTOTAL
Whilst continuing to hold SUBTOTAL turn the power off... then back on
Continue to hold SUBTOTAL until the receipt stops printing
Turn the key to R and give it a test.
IF E1 Error displayed and beep continuously and nothing can be done, open and replace the PCB board's battery.
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