57Troubleshooting GuideIf a problem occurs with the flash, first refer to this TroubleshootingGuide. If this Troubleshooting Guide does not resolve the problem,contact your dealer or nearest Canon Service Center.Normal Flash PhotographyThe power does not turn on.● Make sure the batteries are installed in the correct orientation (p.12).● Make sure the battery compartment cover is closed (p.12).● Replace the batteries with new ones.The Speedlite does not fire.● On the camera’s [Flash control] or [External Speedlite control]screen, set [Flash firing] to [Enable] (p.29).● Insert the mounting foot into the camera’s hot shoe all the way, slidethe lock lever to the right, and secure the Speedlite to the camera(p.14).● If the electrical contacts of the Speedlite or camera are dirty, wipe thecontacts (p.10) with a dry cloth, etc.● Stop using the flash for at least 40 min. after continuous firing over ashort period, which will cause the flash head temperature to rise andrestrict flash firing (p.56).The power turns off by itself.● The Speedlite’s auto power off has been activated (p.25). Press theshutter button halfway (p.25).