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This means there is something wrong with the coin/dollar mechanism. The mechanism is not reading correctly and needs to be changed out or repaired.
The mechanism should be a plug and play part that you could swap with another same unit if you have 2 of the same units.
All I ask is please rate my service thanks
Then something may be wrong with the computer controller, it is sensing something is wrong with the coin input, the computer boards do go bad. Try to shut the power off to the unit for 1 full minute and start it back up and see if it clears.