eufy Video Doorbell S4 Won’t Connect? Here’s How to Fix It

Step-by-step fix guide | eufy Video Doorbell S4

Try this first — Make sure the doorbell has power before you add it. eufy’s S4 user guide says that if it won’t turn on, wire it up first so it can charge, then try adding it again.

This guide is for anyone who can’t add the eufy Video Doorbell S4 in the Anker eufy app, or can’t get it onto Wi-Fi. The setup steps come from eufy’s S4 user guide; the Wi-Fi checks come from eufy’s wired doorbell setup guide and eufy’s guide to a wired doorbell that won’t connect to Wi-Fi, which cover eufy’s wired doorbells in general.

What This Problem Means

Setup is failing: the app can’t find the doorbell, the doorbell doesn’t have enough power, or it can’t join your Wi-Fi.

Common Symptoms

  • The app can’t find the doorbell
  • The doorbell won’t turn on for setup
  • The doorbell won’t join your Wi-Fi network

Safe Checks You Can Try

1. Make sure it has power

eufy’s S4 user guide says that if the doorbell won’t turn on, complete the wiring steps so it can charge, then try adding it again. A quick press of the SYNC button on the back turns it on.

2. Add it in the Anker eufy app

Download the latest version of the Anker eufy app, sign in, add the device and scan the QR code on the back of the doorbell. The S4 guide says to press and hold the SYNC button for 2 seconds, until you hear a beep, to set the doorbell up. eufy’s wired doorbell setup guide also says to turn on Bluetooth on your phone and allow location access when the app asks; the S4 guide says it uses Bluetooth during pairing.

3. Check the power

eufy’s general wired doorbell setup guide includes a Voltage Diagnosis step that checks your transformer can power the doorbell. The S4 user guide doesn’t mention this check.

eufy’s S4 user guide asks for a 16-24V AC, 10-40 VA transformer, and says an underpowered transformer may overheat, burn out or make the doorbell malfunction. If you’re not sure your transformer is up to it, have an electrician check it.

4. Check your Wi-Fi name and security

eufy says the Wi-Fi network name (SSID) must not be hidden.

Older eufy wired doorbells only joined 2.4GHz Wi-Fi, but the S4 works on 2.4GHz or 5GHz, and eufy’s Irish S4 page lists WPA, WPA2 and WPA3 security.

5. Move the router closer

eufy’s guide to wired doorbells that won’t add in the app, written for its older 2K and 1080p wired doorbells, says to move the router closer to the doorbell if you can. Once the doorbell is added, you can check its signal strength under the doorbell’s Wi-Fi Connection setting in the app.

When To Contact Support

If none of these steps fix it, contact eufy through eufy’s support site.

Need a hand with this?

If the transformer or mains wiring needs checking or changing, or you are unsure about the doorbell wiring, have a qualified electrician look at it. You can compare up to 3 quotes from local electricians.

We may earn a commission if you request quotes through this link, at no cost to you.

⚠️ Important: This page is for guidance only. Always turn off the power at the circuit breaker or fuse box before touching any wiring, and use a qualified electrician if you are not sure. Follow eufy’s official guidance for your device.