Samsung refrigerator defrost thermostat and thermal fuse helps:
Basic electrical tests and information: How to use a ohm meter, how to use a volt meter
You will need a volt/ohm meter to test a thermal fuse or defrost thermostat. A needle or digital meter will work.
An example of good continuity on a digital meter is here.
An example of good continuity on an analog meter is here.
An example of open or no continuity on an analog meter is here.
An example of open or no continuity on a digital meter is here.
The thermal fuse can be tested in a cold temperature or at room temp. The thermal fuse should have continuity when good and no continuity when bad and needs replacing.
The defrost thermostat *should* be open or have no continuity/ohms at room temp and show continuity/ohm when the thermostat is cold and at or below 32 degrees F ( -18 degrees C ).
Some Samsung Refrigerator Thermal Fuses...
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Thermo fuse assembly
Item Number DA47-00301D
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Thermal fuse for defrost heater
Item Number DA47-00095E
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Thermo fuse assembly
Item Number DA47-00301B
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Thermal fuse for defrost heater
Item Number DA47-10160H
Thermal fuse *should* have continuity all of the time. If the thermal fuse shows no continuity or open, the fuse will have to be replaced.
Some Samsung Refrigerator Defrost thermostats...
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Bimetal thermostat
Item Number DA47-00243K
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Thermo bimetal protector
Item Number DA47-00243S
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Bimetal Protector
Item Number DA47-00243A
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Thermal bimetal protector
Item Number DA47-00243R
The defrost thermostat *should* be open or have no continuity/ohms at room temp and show continuity/ohm when the thermostat is cold and at or below 32 degrees F ( -18 degrees C ).
An example of good continuity on a digital meter is here.
An example of good continuity on an analog meter is here.
An example of open or no continuity on an analog meter is here.
An example of open or no continuity on a digital meter is here.
Video help below can help with testing a defrost thermostat/bimetal. Remember, closed or has continuity when cold is normal, open or no continuity at room temp is normal. Anything else than these and the defrost thermostat should be replaced.
CLICK the picture----> 
YES defrost thermostats can become intermittent and unreliable. -Sometimes- we just replace the defrost thermostat as soon as we see a frost build up just to be on the safe side.
Related Links
- Shop Samsung Refrigerator Parts
- Samsung Refrigerator Parts
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