when heating water fuse go off (Edit: RCD trips)

[Peter.D]

Hello, when I switch on the electric boiler on "sink" it is normal when I change on "bath" the fuse goes off

 

[Peter.D]

and after 1h of working on "sink" the fuse went off and I needed to turn off my boiler to put back the fuses

 

[Deleted member 267285]

I know you’re Irish, but this post doesn’t need to be what exactly do you mean about the fuses? Are you replacing fuses as they blow?

 

[Peter.D]

im Polish but live in Ireland
I have something like this (fuses)
and one signed RCD is going off

picture from google

 

[JohnD]

Most likely the element is old and the outer sheath has become porous, allowing water to get in. A plumber can fit a new element quite easily.

What colour is your cylinder? I do not think it is a boiler.

Some photos of the cylinder and the immersion heater head, will give an idea of age. An older one is harder to get out.

 

[Deleted member 267285]

im Polish but live in Ireland
I have something like this (fuses)
and one signed RCD is going off

View attachment 304649 picture from google

Ok, they’re not fuses, but miniature circuit breakers (mcb’s). Definitely the rcd that trips? As per John, can you post photos of the actual “electric boiler” and what exactly you’re saying is switching to the bath?

 

[Peter.D]

not so old...

 

[Peter.D]

sorry my knowledge of this is really poor

 

[Deleted member 267285]

Could be moisture/water ingress as per John, could be wiring fault.