Shelly 2.5 sparkling neutral

[Lucas]

Dear all,

I have a Shelly 2.5 device, that when functioning is making a sparkling / cracking sound on neutral a couple of times a second, creating a visible flash. Weirdly, the device is functioning properly. I attached a video of the issue. Obviously, I disconnected the device for now. Here is a bit of background information and things I've tried:

• The device was working without any sparks in my previous home
• The device is functioning properly. 
• I opened the cased and there is no visible damage
• I live in The Netherlands (230V AC) in a newly built house (2023) with solar panels
• The problem persists even without any connections to the O and SW ports. Earlier, I connected 2 60W TL lights in parallel
• The problem persists after replacing the L and N wires
• A Shelly 1L in the same location is working perfectly (without a N connection)
• There are no other electrical issues in the house. 
• The fuses are still up

What on earth could this be? Online I read that a sparkling neutral can be caused by a short circuit from live to ground, but Shelly has no ground connection. I really hope someone can be of any help!

All the best,

Lucas

[Lucas]

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[thgoebel]

Most likely, the solder junction between the circuit board and the screw-type terminal is broken. This happens if too much torque was applied to make the connection. This issue may be repaired: Desoldering and reworking the pin of the terminal will be sufficient. And be aware not to apply excessive torque…

[Lucas]

Dear thgoebel,

 

Many thanks for your reaction and apologies for the late response - it took me a while to gather the right materials. 

I did as you suggested, but it turns out I'm quite bad at soldering and after reconnecting to power, my house's fuse blew and I think I'm giving up on this device.