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The Canon EOS 7D was Canon's first high end professional camera with an APS-C crop sensor.

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Got Error 40 on my camera Canon Eos 7D what the problem

The Canon Eos 7D can turn on and operate but when I turn any button is had the sign Error 40 and than I switch off and take out the battery and reboots but another thing is that when I switch to movie its work and also can take picture. What the real problem. Hope to hear from you soon.


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Good Day Chris,

Can the error 40 be clear once and for all with other kind of method. I had use your advice but its can back once the next day I on the camera. Surly this is not we want . Hope we can once and for all clear the error away. Hope to hear can you soon. Thank and much appreciated.



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Error 40 : Battery related error:

Clean the contacts of both battery and camera with isopropyl alcohol. Try replacing the battery.

To get rid of the error temporarily in order to use the camera follow the procedure, switch on your 7D and switch off the moment you see the error, remove the battery wait for atleast 30 secs before putting the battery turn the dial to movie mode, put back in the battery and switch it on the error will go away now quickly go to manual option and then menu and disable lens cleaning option the error will go away but will come back after you switch off, so you'll have to repeat the step.

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error 40 is normally located 40cm behind (or in front of) the device in question :)


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