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Samsung Diag codes F5 / 5 \\ Defrost heater ?'s

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Samsung RD 2155 SH. Build date of about 2004. Shows a diag code of F5 / 5 on the temp

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  #1 (permalink)  
Old 12-15-2011, 06:28 AM
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Default Samsung Diag codes F5 / 5 \\ Defrost heater ?'s
Model Number: RB 2155 SH   Brand: Samsung   Age: 5 - 10 years   

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Samsung RD 2155 SH. Build date of about 2004. Shows a diag code of F5 / 5 on the temp screen. This says F sensor short circuit or connector contact failure. Not sure where to check for this short? I have checked the thermistors in both boxes and they ohm out ok. (5k ohm @ room temp / 13k ohm @ freeze). Thermofuses ohm under 1/2 ohm in both boxes. Defrost heater in fridge reads 84 ohms. Defrost heater in Freezer reads 57 ohms. The defrost heater ohms in the freezer seem low using the spec of 100 ohm +/- 20. Am I safe to replace the freezer defrost heater? Any help would be great.


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  #2 (permalink)  
Old 12-15-2011, 08:03 AM
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I do not think replacing the defrost heater will do anything.
You are in spec as 80 would be the low end.
Also as far as I know it is just a straight piece of heating wire so it really cannot lower it's resistance.

Did you disconnect the thermistors/plug at the control board and measure them?

If they are OK there then remove the control board and check it.
Are the pins clean?
Check that the crimps are OK.
Wiggle the connection while watching the back of the board to see it they are loose in the solder. A magnifying glass helps here.
Check for cold solder joint. Thees are often a duller grey or have pin holes.
Check the tracks on the board that go to the thermistor pins for hairline cracks.

If all OK then you probably need a new control board as it is generating a false error.
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