Question about Samsung Refrigerators

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Fridge side affected, not freezer. Unit stops cooling. Fan noise gets louder, runs nearly constantly. Discovered ice behind the storage bins, so I set about defrosting it. This was in Late November, '10, first time it happened. Solution I found was to completely remove fan/cooling unit & housing, defrost it and reinstall it. Worked, but has happened 3 times since November. Each time it starts cooling again but soon re-freezes. Last time only lasted maybe 3 weeks, then box started not getting cold again.

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  • loosedrag Mar 25, 2011

    Thanks WC. I have a Samsung RS267LBSH, which is a two-evaporator, twin-cooling system. If you happen to know where either the defrost timer or the defrost thermostat (refrigerator side, not freezer) is on this model, or can point me to a schematic, that would be great. I'll try to figure out whether I have an adaptive defrost control. I won't be able to try your suggestions until the weekend. Meanwhile, thanks much for your expertise.

  • loosedrag Mar 28, 2011

    WC:
    RO48 is listed as a "pcb case" ($6). RO47 listed as "pcb case assembly" ($36), and the two of them appear to clamp together to cover something called a "pba" (call for availability. No price given).
    I still can't tell from the diagram where to start hunting for this part. Is it in the box itself or on the outside? Do I access it from the gizzards of the fridge once I have the whole unit out of the fridge box? Is there some way I can send you a picture of the assembly I pull out? How do I send you more money for the help you're providing? email is loosedrag at gmail.

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  • Master
  • 4,059 Answers

DEFROST PROBLEM
The evaporator coil behind the cover on the back wall inside the freezer will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle.

If this ice is not melted it will continue to build up until the air can't flow over the coil to circulate the cold air through the freezer and into the fridge. The temperature change in the fridge is usually noticed first followed by the freezer.

If the defrost thermostat is bad, it can prevent the heater from coming on OR it won't turn the heater off when it gets too warm. It is clamped to the evaporator coil at the top to sense the temp. If it appears to be misshapen it is bad.
With an ohm meter it should show continuity when cold and none when warm.
You can also bypass(disconnect the two wires plugged into it and twist them together) the thermostat to see if the heater comes on then. If it does then you know the thermostat is bad and needs replaced.

The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if it's bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when it's in the defrost mode.

If you have a defrost timer you can test it. It can be located under the fridge behind the kick panel on the front. Some are in the fridge with the controls at the top. You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer because that means the timer is not running. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

If you have an adaptive defrost control instead of a timer, replace it if the heater and thermostat test good. It is located in the fridge with the controls in some models and on the back in others.

Post your model number for more specific information.

Posted on Mar 25, 2011

  • Charles T Nevin
    Charles T Nevin Mar 25, 2011

    Part RO48 is your defrost control or PCB in this DIAGRAM

  • Charles T Nevin
    Charles T Nevin Mar 28, 2011

    The parts shown in the diagram are in the area of the compressor which is on the back underneath the fridge/freezer. I think you will recognize the part from the diagram when you see it. You don't have to take a lot out to get to it.

    As far as money goes, when you accept the answer the payment is automatically processed. I'll help as much as I can till the problem is solved.

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