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Troubleshooting
Operating Instructions 827/827-M - 01.0 - 02/2019
Code
Possible cause
8402 -
Internal error
8405
8406
Checksum error
8501
Software protection
Remedial action
• Perform software update
• Perform a machine ID reset
• Replace the control
• Perform software update
• Replace the control
• The DA tool must always be
used for software updates
99
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