heating in the netherlands

Hi everyone, I live in the Netherlands and now in the winter season need to use my heaters to stay warm. However, I've noticed that out of the 5 heaters we have in the house, the only one that actually works whenever it's used is in my flatmate's room. Mine works every 5 tries (by switching it off, then setting it to 5 (the strongest setting) and back again and so on. Then when it switches on, it may only heat the top of the radiator or switch itself off. In my bathroom and living room it seems to have given up altogether (but never been on since I've lived here). does anyone know if there is a switch I need to turn on to use my heaters, or what it could be?

I appreciate any return :)