Canon eos 40d 1901b014 User Manual

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If there is a problem with the camera, an 
error message appears. Follow the on-
screen instructions.
To recover from the error screen, turn the 
power switch off and on, or remove and 
reinstall the battery.
If error 02 (CF card problem) is displayed, 
remove and reinstall the CF card or format 
the card. This may resolve the problem.
If the same error keeps appearing, there may be a problem. Write 
down the error code and consult your nearest Canon Service 
Center.
Error Codes
Error code
Countermeasures