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Freezer is cold, but fridge is not

I have a black and decker mini fridge with a separate freezer compartment. Model is ‎BCRDK32B. Recently the bottom stopped being cold. Not much is inside, besides some water bottles and drinks. It feel more being barely cool. Freezer is cold on top and seems normal. There are some frost that I noticed more then normal. I did try to completely turn off the unit and let it defrost over night and start it back up, but still the same. There’s no fan from what I can tell. I was planning on replacing the thermostat but not sure if that would address the problem considering that it’s cooling the top. I did happen to adjust the thermostat prior to noticing it stopped working, but I think that was about 1-2 weeks prior.

Diagram from the back

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Ja Nee
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how old is the unit?

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we got the unit second hand maybe 4 years ago from a friend. i assume they had it for at least another 3-4 years.

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Hi @r3d3nvy,

What is the actual temperature in the freezer compartment?

Looking at the schematic you posted, there is no evaporator fan in the unit so there may be two ways that the compartments are being cooled.

i). If there are vents inside of each compartment (usually at the back), this means that there is an evaporator unit in the freezer compartment at the back behind a panel and cooling the refrigerator compartment relies on the cold air from the freezer compartment “falling down” into the refrigerator compartment, via a chute between the two compartments, to cool it down. Cold air falls, hot air rises.

ii). If there are no vents in either compartment then the sealed system refrigerant pipes are routed through the walls of the cabinet and the compartments are being cooled that way

The preset freezer and refrigerator temperatures in most domestic refrigerators is -18°C (0°F) and 4°C (38°F)

Is the compressor running continually trying to drive down the temperature or does it stop occasionally for a while and then restart ?

If it stops and starts, it may be a faulty thermostat, stopping the compressor because it thinks that the correct temperature has been reached. When the temperature rises again, (doors being opened and cool air being lost etc) the compressor is restarted. The thermostat’s temperature range may have shifted so that it cuts off sooner than it should.

If the compressor is running continually, it may be a sealed system problem i.e. lack of refrigerant, faulty compressor etc. Is the compressor getting too hot to touch?

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Ja Nee
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Thank you for the response. As of this morning (after 24hrs being plugged back in), freezer is reading 0 degf, but fridge is reading about 60 degf (as opposed to when it was unplugged at (70 degf). Right now compressor seems to be just running continuously (can hear humming and freezer is cold). The compressor is hot to touch. Temp of the compressor is about 140 degf. Measuring with a infrared thermometer. I dont see any "chute" in this fridge. The only hole I see within the fridge portion is the drain hole at the bottom and where the wires are at the side for the thermostat. I assume it's as you say using the walls to cool. Could there be some kind of blockage on that part? It used to work and cool down, but it hasn't done that. The lowest I seen the fridge portion get after days running is maybe at best 55 degf.

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@r3d3nvy

It may be a partial blockage in the sealed system restricting the flow of the refrigerant.

Fixing this will no doubt cost more than what the fridge is worth as getting to where the blockage is may be impossible, especially if in the walls of the cabinet.

I don't think that it is a lack of refrigerant or a compressor problem as then the freezer wouldn't get that cold.

Blockages can be caused by tiny particles of debris floating around in the system and getting stuck at the capilliary tube entrance (very small).

You could try turning off the refrigerator and letting the compressor cool a bit and then if you can access the tubing near the compressor and gently, stress gently! try to move it, tap it etc to hopefully dislodge any debris so that it hopefully will float away to some other part and stay there. Then reconnect the power and try check what happens to the temp. It might work and if so then maybe not for long, perhaps a few days, weeks but it may come back too.

Of course if the blockage is elsewhere in the tubing you cant get at it to try and dislodge it.

Not sure if evacuating the system and replenishing the system with refrigerant will resolve it either but as I said earlier this will probably not be economically viable.

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@jayeff I'll give that a try over the weekend and see if that helps. Definitely worth a try at this point. If you have any other advice or tips let me know and I'll try those as well. I'm hoping that could help and if it does that'll be great for sure.

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For a refer, the freezer is the part where the cooling coils are. The frig part gets cold via a port between the freezer and the frig. There should be a fan in that port that would be run based on a thermistor sensor in the frig.

If it has an auto defrost and it is freezing up, the ice may be blocking the port. The problem then might be a bad seal or the door is slightly ajar. My sister had that issue with her freezer door and it was difficult to see. A drawer inside was holding it very slightly open. The tech also missed that.

But then if you totally defrosted it, then the frig should have gotten cold for a time.

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Ja Nee
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I ended up defrosting the whole system again overnight, as well as taking your advice and checking the seal (seal seems good no leaks from what I can tell used like a paper to check the resistant between the seal) and changing the thermostat just while I was at it. Just turned it back on and we'll see if that helped. So far, freezer is cooling down, but fridge remains kind of warm. I dont think for my model there's an a fan from what I can tell. I'll attach a diagram of how it is from the back.

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Im facing the same problem with a Siemens fridge, did you solve this issue with your refrigerator?

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