Canon MT-26EX-RT Macro Twin Lite - Manual (Page 112)

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If a problem occurs with the flash, first refer to this Troubleshooting
Guide. If this Troubleshooting Guide does not resolve the problem,
contact your dealer or nearest Canon Service Center.
Normal Flash Photography
Make sure the batteries are installed in the correct orientation (p.18).
Make sure the battery compartment cover is closed (p.18).
Replace the batteries with new ones.
Insert batteries into the flash unit even when using an external
power source (p.109).
Insert the control unit’s mounting foot into the camera’s hot shoe all
the way, slide the lock lever to the right, and secure the control unit
to the camera (p.20).
If the < G > indication remains displayed for approx. 30 sec. or
longer, replace the batteries (p.18).
If the electrical contacts of the control unit or camera are dirty, wipe
the contacts (p.11) with a dry cloth, etc.
When you perform continuous firing repeatedly over a short period
of time, causing the temperature of the flash heads to rise and flash
firing to be restricted, the firing interval increases (p.110).
The MT-26EX-RT’s auto power off has been activated. Press the
shutter button halfway or press the test flash button (p.27).
If there is a highly reflective object in the picture, use FE lock (p.42).
If the main subject looks very dark or very bright, set flash exposure
compensation (p.40).
Troubleshooting Guide
The power does not turn on.
The MT-26EX-RT does not fire.
The power turns off by itself.
Pictures are underexposed or overexposed.