Canon Speedlite Transmitter ST-E3-RT - Manual (Page 63)

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If a problem occurs with the transmitter, first refer to this
Troubleshooting Guide. If this Troubleshooting Guide does not resolve
the problem, contact your dealer or nearest Canon Service Center.
Make sure that the batteries are installed in the correct orientation
(p.12).
Insert the mounting foot into the camera’s hot shoe all the way, slide the
lock lever to the right, and secure the transmitter to the camera (p.13).
If the electrical contacts of the transmitter and camera are dirty, clean
the contacts (p.7).
The charge lamp lights when the wireless shooting (slave) is ready.
The transmitter’s auto power off function has activated. Press the
shutter button halfway, or press the test flash button (p.14).
Check that the slave unit supports radio transmission wireless flash
shooting.
Set the slave unit to <'> <x> (p.20).
Set the transmission channels and wireless radio IDs of the master unit
and slave unit to the same numbers (p.20).
Check that the slave unit is within the transmission range of the master
unit (p.16).
Troubleshooting Guide
Power does not turn on.
The power turns off by itself.
The slave unit does not fire.
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