Canon EOS 7D

Started Mar 16, 2013 | Questions thread
Doug J Veteran Member • Posts: 9,283
Canon "err" code descriptions

Canon published a list of EOS error codes last year, some of the codes do not identify the specific problem, but might be useful in localizing the error. Err20 is on page 2.

Err 20: Mechanical malfunction
Within the mirror, shutter or aperture mechanism (most likely), some sort of disturbance, error or lock-up has been detected. This error code doesn’t specify where the exact problem is, but points to the cause being mechanical rather than an electronic gremlin.

You could try to clean the lens contacts or use a different lens to check for point #3, a mirror or shutter problem will probably mean a trip to Canon for service.

Source: EOS err descriptions

Good luck!

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