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TheAChub
Error Code Er91
1. Error code definition
Firmware update error (outdoor unit)
2. Error definition and error detection method
The error code will be displayed when the outdoor unit fails to write the firmware update program.
3. Error source, cause, check method and remedy
Error source Cause Check method and remedy
Outdoor unit (1) Failure of the microcomputer or the flash
memory on the control board
Replacement of the control board
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