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Try pressing the Clerk buttons, one after another, and see if the error clears.
Then try a reset (if you're willing to risk erasure of information in the register):
Turn key to Off.
Hold down the Receipt Feed (not Journal Feed) key, and turn the key to
Wait 5 seconds, then release the Receipt Feed key.
Does FFFFFFFFF (or the like) display?
Then press SUB-TOTAL, and turn the key to REG.
That's a defective result to say the least. Remember that a full reset erases all programming in the register, and so programming of the register keys will now have to be done over.
(Unless this was such a defective result, that the register is now 'broken' in another, different, manner.)
Is there any E03 or other Error code displaying, since the reset?