Question about Samsung Refrigerators

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Samsung SRS536 side/side fridge no auto start, now weak cooling

A couple of weeks back our fridge stopped working ie no compressor coming on, though light was coming on. I discovered that if I turned it off then on, the compressor would start and it would thermostat to the correct temp. However it would not restart when it warmed up again. I saw this problem described similarly on Fixya but could not find a useful cause.

I had the idea to keep it running until I had time to do something with it by using a timer switch. I set this to come on 7 times in 24 hours with 15 minute off periods. This worked OK for 2 weeks, but now the fridge temp is only getting down to 13 deg C and the freezer is about -1 deg C, though the compressor is coming on. I can't really feel cold air being pushed out of the vents and the side panels (where the heat exchangers are) don't feel like they are getting warm, though maybe they don't get very warm most of the time anyway.

I am going to check the fans today, by taking the front fascias off from the front/inside. I have had a look at the motor/compressor etc and vacuumed, but it was pretty clean. It was bought in 2004, Australia so 240V version.

More details:
Model
SRS536NP

Compressor
DK182Q-L2U

Model code
RS20NASL1/XSA

serial no
817642BX600397B

And a pic of the block diagram on the back is here

http://i251.photobucket.com/albums/gg302/triode101/DSCF1486.jpg

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  • geoffjunkste Jul 31, 2010

    Thanks.

    I have more info. I have removed the freezer fascia and see that it is all iced up, that is preventing airflow. So I am defrosting to re-test. I wonder why it did not defrost itself though?

    I would like to look into the controller electronics, where might I get a schematic or service manual? I have not tried Samsung yet since I hear they are shitty with help. I might add I am technically oreiented so can do a lot of investigation electrically, if I have some data.

  • geoffjunkste Jul 31, 2010

    OK, have defrosted and it is chilling OK.

    Possible scenario- the fault which causes a lack of re-starts of the compressor after the fridge warms up is still there, but my use of periodic resetting with a timer prevents the auto defrost from working. I have no idea when the system defrosts itself, maybe someone can offer general guidelines which most fridges follow? Until I can look at the electronics, I will continue with the timer. Maybe leaving it with no reset periods between midnight and 7am will allow a defrost cycle. I don't know but I will try this.

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You give a pretty good discription;i would say this machine has leaked gas, the hole is not visable to the human eye therefore the machine is working and working trying to maintain the temp.my advice to you is buy yourself a new fridge,because this one will cost to much money to repair.adrian,,,,,,

Posted on Jul 31, 2010

  • geoffjunkste Mar 13, 2013

    UPDATE. I have figured out this problem. Once I searched a lot on the internet, I found some service manuals for fridges of similar age. I discovered that the defrost sensor on my fridge was reading too high ie. 25 kohm for 22 deg C ambient. It should have been about 5.5 kohm.This causes the defrost to stay on, causing the thermal fuse to blow. Once I found out that the defrost element is the skinny pipe in front and back of the evaporator, the penny dropped. All 3 heaters in the freezer check OK in resistance and I could not detect any shorts to the evaporator, (which I thought was the original fault.) Samsung Australia were no help, they in fact were obstructive, refusing to supply internal fridge parts. I have found these sensors are easy to get though from parts places. In the meantime, I have bought a new 6 door Mitsubishi fridge. It is fantastic and has 5 year warranty. I. I already have a 20 year old Aussie made Hoover fridge in the garage which is super reliable, so will sell the Samsung as I think it will become unreliable in the future.

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