Samsung intermittent cooling, transitions to defrost cycle? RF268ABRS


Samsung intermittent cooling, transitions to defrost cycle? RF268ABRS...

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secondesign
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7 yr old samsung french door refrigerator, dual ice makers, compressor is very strong, will run for 24-36 hrs, then cabinet heats up to 60 degrees for 24+ hrs, then begins operating until the next shutdown. Utility appliance repair plan crews replaced 3 circuit boards, after nearly 3 weeks a tech finally tested the resistance at the compressor and pronounced it had power, called it a compressor problem and departed. At this point I purchased a new frig. It makes no sense to me though that the compressor would control the defrost cycle? 

My question is if the circuit boards were not the cause of the problem, what else actuates the defrost cycle? 

sam model RF268ABRS  mfgr date 1/2012
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the control board is what controls the defrost cycle on that model so it sounds like samsung has a bunch of faulty boards for this model





secondesign
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Had three different repairmen over four visits under my appliance repair insurance,  the main board was replaced twice in two weeks, the panel over the dispenser with board and another small board were replaced. I was told there wasn't a board on the compressor? The dispenser panel display when the cabinet was warming would show the temperature as set, much later it would show the actual (warm) temps which made me suspect a temperature sensor but I was told the sensors were on the replaced boards?  The compressor when running will freeze a large pan of water in an impressive time. I was told that both replacement boards were new and not refurb'd, but who knows?
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Hello Second design, Did any of the service guys access the built in diagnostic tools,  get a FSM(factory service manual)  using the control panel you can monitor all the sensors, motors, switches even the compressor to see what is happening.   If this is a twin cooling plus system then you have two temperature sensors, two defrost ckts and two independant cooling systems..... is the compressor cycling on and off....not sure what it should be....but once or twice an hour it should start run for a while then rest, then run again.   an easy way to find out if the freezer is staying cold is to freeze a glass of water with a popsicle stick straight up and down.... if after a time you notice that the popsicle stick is leaning off verticle you have evidence that the freezer is not keep things frozen.  The temperature in the fridge is determined by the fan in the evaporator on the fridge side.   A common problem with this twin cooling plus system is that the defrost circuit on the fridge side is not able to keep up with the ice build up in fan housing....the system monitors the whether or not the fan is turning by a signal from the fan telling the puter how fast the fan is running...if the ice is blocking the fan it cannot turn.... eventually the puter will stop trying to run the fan so it does not destroy itself...with no air moving accross the evap the box will gradually warm up.... the ice will eventually melt.... the fridge will function until this cycle repeats itself .......again not knowing your model I can only base this on the supposition that all the samsung twincool systems work the same way.  Have you ever noticed a ticking noise that slows down and stops with the door open....this is caused by ice beginning to interfere with the fan blades....if allowed to continue eventually the ice with completely block the fan....box will heat up,,, the ice will melt.... agaain and again.  I am not totally sure as I am just getting into fully understanding the twin cool system.. but i believe the freezer temp and defrost cycle are what control the compressor.... or possibly it is much more sophisticated.... I do know that there are temperture and humidity sensors... and the evap fans are multi speed fans.... controlled by the puter....its a fun time... one last thing my experience in electro mechanical systems goes from the 60-til present day and once we moved from discreet components to ICs  the vast majority of failures of these systems were related to bad connections and analog componets (switches and sensors) not the electronic modules.....just my two cents.... if any one has any comments please feel free to tell me what you think either + or minus.
capn






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