Four types of control-panel messages can indicate the status of or problems with the product.
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| Status messages reflect the current state of the product. They inform you of normal product operation and require no interaction to clear them. They change as the state of the product changes. Whenever the product is ready, not busy, and has no pending warning messages, the Ready status message appears if the product is online.
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| Warning messages inform you of data and print errors. These messages typically alternate with the Ready or status messages and remain until you press the OK button. Some warning messages are clearable. If the Clearable Warnings menu in the Display Settings menu is set to the Job option , the next print job clears these messages.
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| Error messages communicate that some action must be performed, such as adding paper or clearing a jam.
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| Some error messages are auto-continuable. If the Continuable Events menu in the Display Settings menu is set to the Auto-Continue option, the product continues normal operation after an auto-continuable error message appears for 10 seconds.
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| NOTE:
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Pressing any button during the 10-second auto-continuable error message overrides the auto-continue feature, and the button function takes precedence. For example, pressing the Stop  button pauses printing and offers the option to cancel the print job.
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| Critical error messages inform you of a product failure. You can clear some of these messages by turning the product off and then on. These messages are not affected by the Auto-Continue setting. If a critical error persists, service is required.
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HP LaserJet 600 M601 M602 M603 Control-panel message types