Got a Samsung model RSA1SHPN American style FF that keeps running more than it should do and eventually the fan in the freezer compartment starts clattering against the frost that has built up.
I've done a power defrost (twice) and then it seems OK fror a couple of days then the compressor keeps running on and on and later the fan starts clattering again. There is no error codes flashing in the display. Modern FFs seem to have circuit boards, multiple sensors and are more complicated than I expected. I'd appreciaste some advice before I start ordering spare parts and getting stuck into pulling panels out.