Food in the refrigerator side is freezing. samsung rs2555sl/xaa. I opened the rear panel inside the refrigerator. the evaporator is covered with ice. I dried all that with the help of a dryer. With the help of multimeter i checke dthe resistance in the thermalfuse, heater and thermistor. Somehow in my mutimeter i couldn't make the needle to go to zero when i short it. but it's going till 1kohm. when i checked the resistance in the thermal fuse and heater the resistance is showing as 1kohm. in the thermistor it's showing as 2.5kohm. what do i do now. Can anybody help me with this.

Thank you

The "ice" on the evaporator was snowy and relatively loose. I tested the evaporator fan with multimeter and the readings were 2.5kohms for two points and 3.5kohms for the other one. the fan was rotating freely. I checked the readings for the fuse, thermostat and heater again today.
The readings were thermistor = 6kohms, fuse = 0 and heater was also 0.
Regarding the condenser fan i can hear refrigerator making sound. So iam thinking condenser is working. If you want me to check that also with multimeter i can check it.

Thanks for ur help.

Do you think i can replace the heater by myself or is it better to call the refrigerator technician.

Thanks alot