Re: F-DEF ERROR on Samsung RS21
Big problem with defrost sensors on this model. If you are able to check the defrost sensor on the evaporator , note what colour the end cap is. If its not the latest version ( BLACK end cap) will probably need replacing. part no. SAMS DA32-00006U
This is the latest modification samsung have made after countless problems with this model.
Also check your evaporator cover to see if it has the metal defrost strip from the fan hole. Again if not… must be replaced. part no. SAMS DA 97-00092S
If you can test the connections, 3 plug connections top to bottom these are the expected results.
1.thermal fuse= continuity
2a.main defrost heater= 480 ohms
2b.drain heater= 2 k ohms
3.ntc defrost sensor= 13.3 k ohms @ 0 degrees c.
Hope it helps.