Are you having issues with overloads or short circuits? You can easily fix this yourself by resetting the fuse (upward). It is located in the meter cupboard in the hallway next to the kitchendoor.
An overview with all room numbers and electric group numbers is available in the meter cupboard.
In the case of electrical faults, first check which group is affected. Next, take all the plugs in that particular group out of their sockets. Reset the entire group. You will find the cause of the fault by putting the plugs back into the sockets one by one.