Using The On-Remote Help; Logitech's Harmony Remote User Forums - Logitech Harmony 900 Quick Start Manual

Using the On-Remote Help

When one or more of your devices don't power on or off, or when they don't switch inputs correctly,
you can use the Help button on the remote for simple troubleshooting. Answer the questions on
your Harmony remote to re-synchronize it with your entertainment system. See
button.

Logitech's Harmony Remote user forums

You can also access the user forums to see what other users like you're discussing. Simply go to
http://forums.logitech.com/.
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Using the Help