eufy Video Doorbell S4 Offline? Here’s How to Fix It

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

Try this first — Check the doorbell has power and that its wires are firmly connected. Both checks come from eufy’s guide to wired doorbells that go offline.

This guide is for owners of the eufy Video Doorbell S4 whose doorbell shows as offline in the Anker eufy app. The steps come from eufy’s guide to wired doorbells that go offline, which covers eufy’s wired doorbells in general, and from eufy’s S4 user guide. Where the S4’s own pages give a different figure, we use the S4 figure.

What This Problem Means

The app can’t reach the doorbell. eufy’s checks cover the power to the doorbell, the wiring, and then your Wi-Fi network and router.

Common Symptoms

  • The app shows the doorbell as offline
  • No ring alerts on your phone
  • Live view won’t load

Safe Checks You Can Try

1. Check the doorbell has power

eufy’s first check is that the power is on. The S4 is wired only: eufy’s Irish S4 page says it doesn’t support battery or solar power, and its small built-in battery is only a backup for power cuts.

2. Check it is switched on

eufy’s S4 user guide says a quick press of the SYNC button on the back turns the doorbell on, and pressing it 5 times within 3 seconds turns it off. If it is off, press SYNC once to turn it on.

3. Check the transformer

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 the wires

eufy says to check that the wires are firmly connected to the doorbell. Turn off the power at the fuse box or breaker before you touch any doorbell wiring.

5. Test with your phone’s hotspot

Turn on your phone’s hotspot and connect the doorbell to it. eufy says that if the doorbell connects to the hotspot but not to your Wi-Fi, the problem is likely to be your router.

6. Check your router

eufy’s router checks are to reset your router and to keep the doorbell within about 9 m (30 ft) of it.

The S4 works on 2.4GHz or 5GHz Wi-Fi, and eufy’s Irish S4 page lists WPA, WPA2 and WPA3 security.

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.