Samsung SIde-by-side : THermostat shows -20 C but the Freezer is not working

[shefalika]

I have a Samsung Side-by-side RS21HSTPN1, 600 ltr.
About two weeks ago the freezer stopped working but the temp on the panel showed -20 C. I called the service centre who came in and said that the gas needs to be filled (greasy droplets had dripped near the compresor at the back/base), They brushed off the coils at the back, changed something called a drier/dryer. filled some gas. Said it would take a few hours for the freezer to be good and left. The freezer starting chilling almost immediately

10 days later, I woke up to find the same thing: Temp shows as -20 C, bu the Freezer was not freezing.
Called the service centre again, this time they said that there we no drips near the compressor.
There was also very little gas in the fridge (apparantly it did not “woooosh” enough when they opened the “valve”)
They opened up the back wall of the inside of the freezer and saw that there was frosting only on the top two coils.
They told me that the fridge probably has an internal leak – and if it does then there is no repair solution.
Nevertheless, they did fill in more gas… and left saying that if this leaks out in about a week then if is more likely than not an internal leak and they would have to verify that with a nitrogen-hold test – and , in that case, there is no repair solution as per Samsung company policy.

The freezer stopped working again this morning.
The Temperature panel shows -20 C.

Online searches set up questions marks against all sorts of potential issues – Thermostat problem, compressor problem, dirt/grit in the gas tube that was not suctioned out the before the first filling of gas, and so on…

Could anybody advise on what this might be and how it could be fixed?
What can I do to save my rather nice fridge from becoming a shoe cabinet?

[SAMURI]

If you had oil near the compressor it sounds like an external leak most likely on the pipe work that runs in the water collection tray.
This should be able to be found and repaired as its rare for an internal leak on a RS21.
But seeing how much food cost to replace, it may be better to replace the fridge / Freezer as American type are a lot cheaper now and a RS21 is an old model now.

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