While Alexa and Echo work well together, sometimes Alexa indicates that the Echo unit is offline.
Users can usually solve this problem quickly and easily with some troubleshooting.
see to it the Echo equipment is plugged in.

Amazon Echo Dot.Image courtesy of Amazon
If it doesn’t have lights, move the Echo to another outlet and hit it one more time.
Restart the Echo equipment.
Either unplug and plug the speaker back in or remove and reseat the batteries.
This simple troubleshooting step often works for many digital malfunctions in the tech world.
Restart the Alexa-enabled rig, and see if this solves the problem.
Move the Echo closer to the router.
Moving the Echo closer to the modem or router boosts the Wi-Fi signal.
These devices can interfere with the signal.
Check the Wi-Fi connectivity.
If the Wi-Fi is down, the Echo appears offline.
test whether the router is working and that its display lights are green.
If you fix a Wi-Fi issue, turn the Echo off and then back on again.
The unit should reconnect to the Wi-Fi web connection and reappear in the Alexa app as online.
verify your smartphone and Echo are on the same Wi-Fi connection.
verify both are on the same web link.
Update the software version on the Echo.
While an Echo should receive updates automatically, an outdated software version may cause an offline issue.
Check the Echo gadget’s software version fromDevice Settingsand update it if necessary.
To manually update Alexa on an Echo, say, “Check for software updates.”
Restart the Alexa app on your phone.
A simple software glitch may be the problem.
Depending your rig on operating system, swipe up on the app view or selectExitto exit the app.
Then relaunch the app to see if this solves the offline problem.
Update the Alexa app on your iPhonefrom the App Store orupdate the app on Androidfrom the Google Play store.
If restarting and relaunching the app didn’t work, an update might patch up the issue.
Uninstall and reinstall the app.
Then reinstall the Alexa App from the App Store or Google Play.
Update the Wi-Fi web link information.
Update this information and see if this solves the problem.
Deregister the Echo rig.
When you order an Echo gadget, it’s registered to your Amazon account before being sent to you.
If it doesn’t show up in the Alexa app, deregister and re-register the gadget.
TapMore>Help & Feedback>Chat with usand ask them to deregister it.
Reset the Echo to factory options.
you could perform this process from the Alexa app or directly on the rig.
Consult Amazon’s Alexa devices help resources.
you’re free to also ask a question in theEcho rig community forum.
Power on the Echo Dot and wait for the blue light ring to turn orange.