Under certain circumstances it is possible for a Nero device to appear as though it has turned on or off by itself, even though there doesn't appear to be a reason. There are a number of things that can cause this behaviour.
Check that it isn't being caused by configuration
Before looking into a hardware solution make sure there isn't any software reason for the device to turn on or off automatically. For example make sure there are no scenes or community plugins controlling this device. If there are try disabling them temporarily and check if the behaviour stops.
Many Nero devices have built in timer features that can cause them to automatically change state, confirm that the parameter configuration for your device is not set to use one of these features. For in-wall devices for example this would be the parameters 11, 12, 13 and 14 but others may apply on other devices. If you want to be 100% sure there are no configuration issues you can factory reset the device and then pair it back into your mesh.
Correcting input issues
Once you have confirmed that there are no software reasons for the behaviour the most likely issue is inductance in the input lines. To work with a wide range of switch types and manufacturers Nero devices detect small changes on the input terminals, this means that inductance caused by any number of environmental factors can cause the device to think the switch has been interacted with and to control the output accordingly.
This interference can be due to a wide number of factors and often is difficult to directly pin down. Thankfully there is a simple and low cost solution to halt this interference! Simply install a 275V X2 0,1microF capacitor between the L terminal of the device and the input terminal (you will need 2 for a dual input device such as the Dual Relay). For example this product from JayCar in Australia has been proven effective. Once installed this device will arrest inductance issues without affecting the switches ability to control the device normally.
If the problem persists please get in touch with us and ensure you include the following information:
- The full serial number of the Nero device, including any S, P, or H numbers.
- The load attached to the device. Please be specific and include load size, make and model, and quantity if possible.
- The time frame the issue appears to occur within.
- What other devices are installed at this same switch location or within approximately 1m of this location.