Here in the south we have a fairly sensitive board but not to the extent of being a problemn [in fact I saw this as a protective advantage]. The switches are up when on and down for off! The first time it tripped though I was confused until an electrician friend demonstrated the need to return all the switches off and then on again to reset the RCD.
I presume ben is talking about a dry Spanish eviroment so this may not be exactly pertinent but a couple of years ago I put on the washing machine which lives in an old style wash house extenal to the main building. This tripped the supply feeding both the kitchen [freezer oven etc] and the external wash house-most inconvenient on a cold, damp, winter Saturday morning
.
I quickly established a problem with the washer [not the dryer] which tripped things whenever operated. I reset the board and temporarily isolated the washer on an extension lead running from another part of the house... no problem. Subsequently I discovered that supplying minimal background heating in the wash house sent the problem away-some sort of moisture related leakage
. Couldn't find anything else wrong with the washer. No problems since! Sounds like the oven elements are prime suspect.
Dave