Advice needed on extractor fan system

[John D v2.0]

Right so it's a 16a MCB tripping so there must be a fair old current flowing in the faulty one, which gives a high risk of fire.i would definitely get them all checked out, in case it's a cumulative effect from a few of them.

 

[flameport]

All of those circuit breakers need to be checked, as millions of them were recalled for being faulty - the fault being that they overheated and melted.
Other questions include why they are not level, and why someone has shoved one from a different manufacturer at the end.