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The Daily Insight

Why did my Harmony remote stop working?

Author

David Ramirez

Published Mar 09, 2026

Why did my Harmony remote stop working?

If Harmony stops sending commands or if the Harmony Express app is unable to discover your blaster, rebooting your Harmony blaster will often resolve the problem. To reboot your Harmony blaster, disconnect the power cable and wait 10 seconds, then connect it again. It will take about 30 seconds to power back on.

How do I reset my Harmony 665 remote?

Press and hold the Menu button (located above the Channel Up button) and the Off button together for 20 seconds. The remote screen will turn off, then turn on again displaying the image of a remote and a circular arrow. After a few seconds your remote will be restored to factory defaults and you may sync again.

How do I reset my Harmony 900 remote?

How do I reboot my Harmony Hub?

To reboot Harmony Hub, disconnect the power cable, wait 10 seconds, then connect it again. Rebooting your router by disconnecting and reconnecting its power cable sometimes helps with any Wi‑Fi connectivity issues.

How do you reset a Harmony remote?

How do I sync my Harmony remote to my TV?

Launch the Harmony app and sign into your account. Select your Harmony remote, followed by DEVICES > ADD DEVICE. Enter the manufacturer and model number for the device you’re adding. Finally, select the sync icon in the upper right corner of the settings menu, followed by SYNC NOW.

What does the bottom button on harmony 665 do?

The bottom button toggles between Activity and device mode. It’s best to always use your remote in Activity mode so Harmony can keep all your devices in sync. The Harmony 665 buttons are automatically mapped based on the Activity you’re in. While watching TV, the channel buttons will control your cable/satellite box.

How many devices can a harmony 665 control?

Your Harmony 665 allows you merge the remotes of up to 10 of your home entertainment devices into one so you can, and should! keep those other remotes out of sight. The Harmony software will guide you through entering the manufacturer and model numbers of your home devices so Harmony understands how to control them.

What to do if Your Harmony Remote is not working?

If the remote isn’t controlling the device you’re using then the first thing to try is putting it on its charging cradle — if your remote has one — low power could be the problem. If it doesn’t have a cradle, then try changing the batteries.

Do you need AA batteries for harmony 665?

If this is your first Harmony remote, create a new account. If you already have a MyHarmony account then you may sign in and add this new remote to your account. Ensure you’ve installed the two AA batteries into the back of your remote.

Your Harmony 665 allows you merge the remotes of up to 10 of your home entertainment devices into one so you can, and should! keep those other remotes out of sight. The Harmony software will guide you through entering the manufacturer and model numbers of your home devices so Harmony understands how to control them.

The bottom button toggles between Activity and device mode. It’s best to always use your remote in Activity mode so Harmony can keep all your devices in sync. The Harmony 665 buttons are automatically mapped based on the Activity you’re in. While watching TV, the channel buttons will control your cable/satellite box.

If this is your first Harmony remote, create a new account. If you already have a MyHarmony account then you may sign in and add this new remote to your account. Ensure you’ve installed the two AA batteries into the back of your remote.

If the remote isn’t controlling the device you’re using then the first thing to try is putting it on its charging cradle — if your remote has one — low power could be the problem. If it doesn’t have a cradle, then try changing the batteries.