Disassembly

[chimaerion]

Care to explain a little bit more? Don't understand what the issue is.

[MeMoRy]

I don't think this comes apart. Can't it just be pulled off?

[MeMoRy]

I don't understand how to separate.
Well, I decided otherwise. Soldered the reverse ends.

Probably good enough. Repairing often requires creativity.

Where can you buy it?

But what?

The denomination is not visible. Burned out designationcond.png

Without context or schematics difficult to say. Looks like an X or Y capacitor.

What is this mysterious detail behind the number 023721 3218 766.0164

You mean 0163? Or wrong pic? There's nothing behind it? Or you mean "What does the number mean"? It's probably some company internal part number.

[MeMoRy]

Looks like a filter circuit. It was probably an X-cap.
https://www.doeeet.com/content/eee-comp ... explained/
The other part is not a standard part, so you really need to either be able to measure, have the schematic or het the past from the manufacturer

[benkr]

The round blue part is most likely a VDR, a Voltage Dependent Resistor, the diameter gives the power, the voltage is most likely 275 VAC

The wire to board things are most likely 6,35 mm slide contact connectors with some kind of a lock, sometimes you have to slide the housing upwards to disengage the lock, here an example of a TE Connectivity connector.

schuifsteker.JPG

[Kjelt]

This looks like a crowbar circuit.
Look at picture below.
The VDR should be high ohm untill the input voltage exceeds the value on the VDR (As Ben said usually 275V in EU).
At that point the VDR will drop low in resistance and shorts the fase and neutral which blows the Fuse, thereby protecting the circuit behind it.

In your case either there was a lightning strike which can cause huge damage also in the circuit behind (lightning struck electronics is 90% game over).
Or there was so much power that the VDR could not handle it.
If I were you I would replace the fuse first, see if the electronics still work (the vdr is only extra safety has no effect on working of the rest of the electronics.
If they still work then also replace the vdr with a bigger power rating as the current one and still at 275V.

[hugo stoutjesdijk]

2023-04-09 17_43_16-file.php (600×800).jpg

without explanation

[Kjelt]

How can that be?
Then it was not just a normal overvoltage or the fuse / VDR combination was choosen incorrectly by the manufacturer.

[MeMoRy]

The round blue part is most likely a VDR, a Voltage Dependent Resistor, the diameter gives the power, the voltage is most likely 275 VAC

Good point. I think you're right. Haven't designed motor circuits, but that seems a common part at that place

By the way, I took a burnt board from the boiler.

Burning is your hobby?

[Kjelt]

I just looked but the only ones I have are these 250VAC 60J 2.5kA
The diameter is 11mm. I think they are too small for your application.

https://www.tme.eu/en/details/var10-250 ... -passives/

[benkr]

If it's not difficult, give a link where you can buy
VDR is not far from me. I live in Nistelrod

That is the problem, I know that in East Europe and more Eastwards our common companies do not operate in that area, there are the same sort of companies in that area of the world but i can't find them.