Liebherr CNesf 5013 fridge freezer: freezer high temps

[cosmik]

Model: Liebherr CNesf 5013 (Index 20E / 001)
Class: SN-T
Service number: 9988745-05
Serial number: 79.667.102.6
Bought on: November 2008
Possibly a no-frost unit as per http://www.fridge-manual.com/liebherr-cn-5013.html

I’ve got this Liebherr CNesf 5013 refridgerator (top: fridge, bottom: freezer) in November 2008. Ambient temps in the summer here are around 28 degrees C (around 82 F, if I am not mistaken).

Some weeks ago I tried to get some ice cream, only to discover that it was not hard. In fact I could easily pull it off. Looking closer, I discovered that it would not keep temperatures real low. There was ice builtup at the back of the freezer compartment.

I asked for a technician to come and have a look. He looked at the back of the fridge and checked the grilles. The bottom half of the grilles was connected to the fridge compressor (not sure of the terminology), whereas the upper half of the grilles was connected to a separate freezer compressor.

Although the fridge-grilles were hot, the freezer grilles weren’t. The freezer compressor *was* hot though.

On his instructions, I removed everything from the freezer, let it defrost for a day and turned it on again. It set the freezer temperature (there are separate controls for freezer and fridge) to the second position (-18 degrees C IIRC) and let it work. After two days, I installed a device that took measurements. For the first two days I did not insert anything at all. On the third day in the noon (around 3pm) I placed some food and drinks in the freezer. I’ve marked the graph appropriately.

As a legend:

* “??”: pm
* “??”: am

I’ve also added a second graph, that shows only the first 24hours recorded, in *F this time.

The technician saw the graph, but was not certain of what could be the issue here. Any ideas on how to approach this issue? From what I concur, he said it could be anything from the freezer compressor itself (a 150 euro purchase, if bought new), temperature sensor, lack of freon, electronics/control issue. I would appreciate any advice that could be given on this.

EDIT: Forgot to mention that the “Alarm” indicator lights up at times and the alarm *beep* is heard. But no error codes are given by the device, just this failure/”Alarm” indicator.

Main problem is that things here at Greece are beyond rough. And obviously if a component is ordered only to find out that it does not fix the issue, the distributor will not accept a return…

[cosmik]

Re: Liebherr CNesf 5013 fridge freezer: freezer high temps

Some added info: looking inside the freezer which is still empty and at -18 for testing purposes, I can see that the back side of the compartment does have some ice. Not much, but there is definitely. Not sure if this is normal or not…

[cosmik]

Re: Liebherr CNesf 5013 fridge freezer: freezer high temps

(bump) Anyone fellas?

[cosmik]

Re: Liebherr CNesf 5013 fridge freezer: freezer high temps

Well, I do understand this is a toughie, however looking at the temp charts perhaps someone could remove certain components as possible culprits. This would help me narrow it down.

So, calling out to fridge experts here once more 🙂

[ELDAR59]

Re: Liebherr CNesf 5013 fridge freezer: freezer high temps

Hello sorry, just seen this. It does sound like you have a system fault here. that is, a fault with either the compressor or the refrigerant level in the system.
Compressor replacement is a specialist job and is beyond the capabilities of the diy repairer, if only for the equipment needed to complete the job.

[cosmik]

Re: Liebherr CNesf 5013 fridge freezer: freezer high temps

Thanks for the information. Regarding refridgerant as a possible cause, wouldn’t loss of it cause an inability to reach a sufficiently low temperature? I’m asking, because from the chart you can see that the freeze is able to reach -20 C, but it just can’t hold temperature.

Like I said, not an expert, just a computer engineer trying to reason what is at fault here and what is not.

[Author]

Posts