Category: Troubleshooting

The bypass is for a load that is too small; the snubber, for one that is inductive. Fitting the wrong one fixes nothing.

It shows in the list but fails when you press. Three causes in order of likelihood, and the first is the battery even when it is new.

Ten 5 W downlights are 0.2 A in steady state and tens of amps at switch-on. Why the relay welds months later, and how to fix it properly.

You have a Shelly controlling an extractor fan. Every time you switch it off, the device restarts: it vanishes from the app for a few seconds and comes back. Or you start hearing a sharp click from the relay that was not there at first. This is not a defect in the device or a…

You fit the device behind the switch, everything looks right, and when you turn the light off the bulb keeps a faint glow. Or worse: it flickers every few seconds, as though it were breathing. You have done nothing wrong. It is a predictable consequence of combining a no-neutral device with modern LED bulbs, and…

You switch provider, a new router arrives, and the next day none of your Shelly devices answer from the phone. The physical switches still work, but remote control has gone. Nothing is broken: each device stored the name and password of the network it was set up on, and that network no longer exists. How…