eufy Permanent Outdoor Lights Not Working? App, Wi-Fi and Reset Fixes

You open the eufy app to change your permanent outdoor lights and they show offline. Or setup fails at the Wi-Fi step, a firmware update will not finish, or the app shows "Server Connection failed". eufy's permanent outdoor lights connect to your phone over Bluetooth and to your home network over Wi-Fi, and knowing which link has failed gets you to the fix faster.

This guide covers the fixes in the order most likely to work, based on eufy's own user guide and troubleshooting pages for the Permanent Outdoor Light E120, plus problems owners have reported on eufy's community forum. Other eufy permanent light models, such as the E22 and S4, may differ, so check the guide for your model too.

Which app you need

eufy's E120 user guide says to use the eufy Life app, version 2.11.0 or later. eufy's support pages also mention the Anker eufy app. If you are on an older version, update before anything else, since the guide sets that minimum.

Quick checklist before you start

1. Check power at the outlet. Exterior GFCI outlets trip after rain or snow melt.
2. Check where the control unit is. eufy's E120 guide says the control unit and power adapter are for indoor use only. A control unit left exposed to weather is worth fixing before anything in the app.
3. Update the app to the latest version.
4. Turn your phone's Bluetooth on and stay close to the lights during setup.
5. Power cycle the lights. Unplug the adapter, wait 30 seconds, plug it back in.

Problem #1: setup fails at the Wi-Fi step

Why it happens: eufy's troubleshooting page says plainly that the 5 GHz network is not supported. If your router broadcasts 2.4 GHz and 5 GHz under one name, the lights may not be able to join.

Fixes, in order:

1. Set your router to broadcast a 2.4 GHz network, or give the 2.4 GHz band its own name, then restart the router. Our 2.4 GHz setup guide explains how.
2. Check the Wi-Fi name and password for typos.
3. Follow the steps in the app in order. eufy's guide says not to skip the Wi-Fi connection steps.
4. Test with a phone hotspot. eufy suggests this to tell a router problem from a light problem. If the lights join a hotspot, the lights are fine and a router setting is the issue.

Problem #2: the app cannot find the lights over Bluetooth

eufy's Bluetooth troubleshooting page gives these steps:

1. Put the lights in pairing mode: press and hold the button on the light for 2 seconds until it flashes white three times.
2. Stay within about 10 m (33 ft) of the lights.
3. Make sure your phone's Bluetooth is on and its mobile data or Wi-Fi is working, since the app needs an internet connection to sign in.
4. Try a different phone. If a second phone connects, the problem is with the first phone's settings, not the lights.

Problem #3: eufy lights keep going offline

eufy lists three causes: the control unit is too far from the router or phone, the Wi-Fi or Bluetooth connection is faulty, or the device has a temporary glitch.

Fixes, in order:

1. Check the distance between the control unit and your router. A mesh node or extender on that side of the house often fixes repeat drop-outs.
2. Restart your router, and turn your phone's Bluetooth off and on.
3. Power cycle the lights.
4. If it is still offline, reset the control unit (below) and add it in the app again.

Problem #4: "Server Connection failed" after an app update

What owners reported: After an app update in July 2026, owners of several eufy permanent light models posted on eufy's community forum that the app showed a blank screen ending in "Server Connection failed". Some could still turn the lights on and off but could not change settings or schedules. Power cycling and clearing the cache did not help them.

What fixed it for them: One owner posted a reply they said came from eufy support, saying the issue had been fixed and to uninstall the app, install the latest version and log back in. The poster said that worked. If you see this error, try that first, and contact eufy support if it persists.

Problem #5: a firmware update will not finish

eufy says firmware updates only work over Wi-Fi. If one fails:

1. Make sure your Wi-Fi is stable.
2. Restart your router, or contact your internet provider if other devices are also dropping.
3. Move the control unit closer to the router, or add an extender near it.

Keep the lights powered until the update finishes.

Problem #6: sections stay dark

If part of the run will not light, eufy's guidance for the E120 is to unplug the adapter and reconnect all of the components, then power back up. Check each connector is pushed fully together. If the same section stays dark, contact eufy support, since it may need a replacement part.

How to reset eufy permanent lights

eufy's E120 user guide labels the control unit button "press and hold for 2 seconds to reset". After a reset, add the lights in the app again and redo your Wi-Fi setup. For a soft reset that keeps your settings, just unplug the adapter for 30 seconds.

Schedules and voice control

eufy's retail listings describe app schedules and Alexa and Google Assistant support, but eufy's E120 user guide does not walk through either. If a schedule does not run, first confirm the lights show online in the app, then delete and recreate it and test with a time a few minutes away. For voice control, make sure the lights work in the eufy app before relinking them in Alexa or Google Home.

Calgary winters and the temperature rating

eufy's E120 user guide lists an operating range of -20°C to 45°C for the product as a whole, with the light strings rated -20°C to 60°C. Calgary and area regularly drop below -20°C, and colder during cold snaps. Running lights outside their rated range puts the parts under stress they were not rated for, so check the rating for your model.

Getting support

eufy's service article pages have a "Contact Us" link for support. Have your model number, app version, phone model and what you have already tried ready.

When troubleshooting is not worth it

If you have reset the control unit, re-added the lights and fixed your Wi-Fi, and they still drop offline every few weeks, the problem is usually not a setting you missed. That is the point where it makes sense to have someone look at the whole system.

How Number One Lights can help

We install permanent lights across Calgary, Chestermere, Strathmore and area. If your current lights keep failing, we can come out, look at what is actually there and tell you straight whether it is worth fixing. If it is not, we replace it with the GOULY Gen 3 system:

• Controlled from the GOULY app, with 1,000+ designs and holiday schedules.
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• Rated for Alberta cold, -40°C to +50°C.
• Professionally installed, with a Transferable Warranty plus workmanship coverage.

Thinking about doing it yourself again? Read DIY permanent lights vs professional install first.

What to do next

If the fix was small, a tripped outlet, a 5 GHz network or an app update, the steps above should have you back up tonight.

If it keeps coming back, get a free quote and a team member will look at your home virtually and send a clear quote. No pressure, no surprises.