Overview

If the LED on a Shelly Wave device is off, this does not always mean that the device is faulty. Some Wave devices turn off the signal LED automatically after a period of time. This is normal behavior and is used to reduce unnecessary LED indication.

However, if the LED does not turn on after pressing the S button, power cycling the device, or checking the power supply, further troubleshooting is needed. This guide explains what to check when the LED on a Wave device is off.

LED behavior on Wave devices

Shelly Wave devices use the multicolored LED to show different device states, such as power, inclusion mode, reset, or alarm states.

For most Wave devices:

• The signal LED turn off after around 10 minutes.

• Pressing the S button should wake the LED indication.

• Power cycling the device should also make the LED show boot behavior again.

For Wave Plug devices:

• The signal LED turn off after around 10 seconds.

This is expected behavior.

If the LED remains off after pressing the S button or after a power cycle, continue with the checks below.

Additional LED behavior on Wave Pro devices

Wave Pro devices have more red colored LED indicators than some other Wave devices.

Depending on the Pro model, the device can have:

• A dedicated red power LED

• One or more output LEDs

• The standard multicolored Wave signal LED

Red power LED

The Power red LED on Wave Pro devices is intended to show that the device has power. If this red LED is on, the device is receiving power. If this red LED is off, the device may not be powered correctly, or there may be an issue with the power supply or wiring.

Output LEDs

Wave Pro devices also have output indication red colored LEDs.

Depending on the model, there can be:

• One output LED for single-output Pro devices

• Two output LEDs for two-output Pro devices

• More output indication LEDs depending on the device model

These LEDs show if the related output is active.

For example:

If the output LED turns on but the connected load does not work, check the output wiring, load wiring, and load power supply.

If the output LED does not turn on when the output is activated from the gateway or local input, check the device configuration, input state, relay state, and possible protection alarms.

Standard signal LED

Wave Pro devices also have the standard multicolored LED indication used for Z-Wave functions and device states.

This LED is used for functions such as:

• Inclusion

• Exclusion

• Reset indication

• Device status

• Calibration

Do not confuse the standard signal multicolored LED with the red power LED or the red output LEDs.

1. Verify normal LED signal behavior

Probable cause

Normal LED timeout, LED indication rule, or temporary software state.

What to check

First check if the LED is off because of the normal LED timeout.

Do the following:

1. Press the S button on the device.

2. Check if the LED turns on or starts blinking.

3. If there is no reaction, power cycle the device.

4. Check if the LED shows boot behavior after power is restored.

For Wave devices, the signal LED may switch off after around 10 minutes. For Wave Plug devices, the signal LED may switch off after around 10 seconds. If the LED turns on after pressing the S button or after a power cycle, the device is most likely working normally. 

If the LED remains off, continue with the next steps.

2. Check the power supply

Probable cause

Power supply issue, wiring issue, or missing voltage.

What to check

Verify that the device is properly connected to the correct power source according to the wiring diagram for the specific model.

Depending on the device model, the supported power supply can be:

• 110–240 V AC

• 24–48 V DC

• 12 V DC

Check the following:

• The breaker is ON.

• The device is wired according to the correct wiring diagram.

• Live and neutral are connected correctly, if the device uses AC power.

• Positive and negative are connected correctly, if the device uses DC power.

• The power source is working.

• The terminals are tightened correctly.

• There are no loose wires.

• The power outlet or power supply is working correctly.

• There is no visible damage on the device or wiring.

For mains voltage checks, use a qualified electrician.

3. Additional power check for Wave Pro devices

Probable cause

Power is missing, the device is not supplied correctly, or the Pro power LED is off.

What to check

For Wave Pro devices, first check the red power LED.

Red power LED is ON

If the red power LED is on, the device is receiving power.

In this case, continue checking:

• Standard signal LED behavior

• Gateway communication

• Device status in the controller

• Output LEDs

• Device parameters

• Possible alarm or protection states

Red power LED is OFF

If the red power LED is off, the device may not be powered correctly.

Check:

• Supply voltage

• L and N wiring

• DC polarity, if DC powered

• Breaker or fuse

• Power terminals

• Power supply rating

• Wiring diagram

• Loose or damaged wires

If the red power LED remains off even when the correct voltage is present, the device may have a hardware issue, contact the support and let us know what you checked and the results.

4. Check output LEDs on Wave Pro devices

Probable cause

Output state issue, wiring issue, load issue, or configuration issue.

What to check

Wave Pro devices have LED indication for outputs. When an output is activated, the related output LED should show that the output is active.

Check this behavior:

1. Turn the output ON from the gateway.

2. Check if the related output LED turns on.

3. Turn the output OFF from the gateway.

4. Check if the related output LED turns off.

5. Repeat the same test using the local input, if connected.

How to understand the result

For devices with more than one output, test each output separately.

5. Check device status in the gateway

Probable cause

Gateway communication issue or device not reachable.

What to check

Open the Z-Wave gateway and check if the device is reachable.

In Home Assistant or Z-Wave JS UI, check:

• Node status

• Last communication time

• Device interview status

• Ping result

• Error messages

• Alarm notifications

• Protection states

If the device is shown as Dead or Unavailable, check signal strength, power supply, and routing. If the device is powered but not reachable, try a power cycle and then ping the device again.

6. Perform a remote device reboot

Probable cause

Temporary software state or communication issue.

What to check

If the device is still reachable from the gateway, try to reboot it remotely. Use the remote reboot parameter or command, if available for the device. Set the remote reboot parameter to the reboot value according to the device documentation.

After the reboot:

1. Wait for the device to start again.

2. Check the LED behavior.

3. Check if the device is reachable in the gateway.

4. Test the local input and outputs.

If the LED starts working again after reboot, the issue may have been temporary.

7. Power-cycle the device

Probable cause

Temporary device state.

What to check

If remote reboot is not possible, power-cycle the device.

Steps:

1. Turn off the breaker or disconnect the power supply.

2. Wait at least 30 seconds.

3. Restore power.

4. Check the LED behavior.

5. Check the gateway status.

6. Test the device again.

For Wave Pro devices, check if the red power LED turns on after power is restored.

8. Reset to factory settings

Probable cause

Corrupted configuration or incorrect settings.

What to check

If the device still does not respond correctly and the LED remains off, perform a factory reset only if needed.

A factory reset will remove:

• Changed device parameters

• Associations

• Gateway connection

• Node ID

• Routing information

• Calibration data, if supported

• Energy data, if supported

After the reset, include the device again in the gateway and check the LED behavior. Use factory reset only after checking power supply, wiring, gateway communication, and LED behavior.

9. When to contact technical support

When you have an unidentified issue or possible hardware failure. Contact support if the issue remains after all checks.

Provide the following information:

• Device model

• Firmware version, if known

• Gateway model

• Z-Wave controller type

• Power supply type

• Wiring diagram or photo, if safe to provide

• Whether the standard signal LED is off

• Whether the S button wakes the LED

• Whether power cycle changes the LED behavior

• For Wave Pro devices, whether the red power LED is on or off

• For Wave Pro devices, whether the output LEDs react

• Device status in the gateway

• Any alarms or error messages

• Steps already performed

This information helps support identify if the issue is related to power, wiring, configuration, communication, or hardware.

Troubleshooting summary

Summary

If the Wave device signal LED is off, first check if this is normal LED timeout behavior. Press the S button or power-cycle the device. For Wave Pro devices, also check the dedicated red power LED. This LED shows if the device has power. Then check the output LEDs to confirm if the related outputs are active. If the device has correct power but the LEDs do not react and the device is not reachable, continue with power supply checks, remote reboot, power cycle, factory reset, and finally contact technical support if the issue remains.