Why Won't My Shelly Device Reconnect After a Power Outage?

Problem Description

Your Shelly smart relay or dimmer does not reconnect to WiFi after a power outage. The physical switch works but the Shelly shows offline in the app and voice assistants cannot reach it. All automations involving this device stop working. This is a widely reported Shelly issue typically caused by the router and Shelly booting simultaneously and the Shelly failing the initial WiFi connection attempt.

Symptoms

• Shelly shows offline in app after power was restored
• Physical switch works but app control does not
• Automations and schedules stopped after power outage
• Voice assistant says Shelly device is unreachable
• Shelly creates its own AP instead of joining home WiFi
• Multiple Shelly devices offline after same outage

Recognize these? Here's what usually causes it.

Common Causes

• Router boots faster than Shelly causing connection race
• Shelly WiFi credentials corrupted during improper shutdown
• Router assigned different IP address after reboot
• DHCP lease expired while Shelly was powered off
• Shelly firmware bug prevents auto-reconnection
• Router connection limit reached as all devices reconnect

Tools & Requirements

Step-by-Step Solution

1

Power Cycle the Shelly Device

Turn off the circuit breaker feeding the Shelly for 10 seconds then turn back on. The device needs a clean boot after the router is fully online. After a power outage it may have booted before the router was ready causing WiFi failure. A manual power cycle after the router is online usually resolves this.

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2

Restart Router First

If multiple devices went offline restart your router and wait 3 full minutes. Then power cycle each Shelly one at a time with 30 seconds between each. When many IoT devices reconnect simultaneously the router queue overflows. Staggering prevents this bottleneck.

3

Assign Static IP Addresses

In your router admin assign a reserved static IP to each Shelly using its MAC address. This prevents IP changes after outages which cause the Shelly to be unreachable even when connected to WiFi. MAC address is on the device label and in the Shelly web interface.

4

Update Shelly Firmware

Access the web interface at the Shelly IP address. Go to Settings then Firmware Update. Shelly has released firmware specifically fixing WiFi reconnection reliability. Plus and Pro series with newer firmware handle outages significantly better than Gen1 devices.

5

Enable Auto-Recovery Settings

In the web interface go to WiFi settings. Ensure WiFi 1 is configured as primary. Set a backup WiFi 2 if available. Enable the restart-if-no-WiFi timer if your model supports it. This causes the Shelly to auto-reboot if WiFi fails which often resolves connection on second attempt.

Quick Solutions

Still having issues? This is usually the deeper cause below.

Need More Help? Shelly Support

Note: The contact information below connects you directly to Shelly's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.