8 bottle wine cooler unit won't cool

try disconnecting temp sensor from board if gets cold replace if same possible compressor kicking off

Our magic chef wine cooler (mcwc50dbt) when temp is set on digital panel at 45-50 it jumps immediately back to 70 degrees constantly

There is no compressor on these units. These units use a Peltier cold/hot module where the cold side faces the heat sink and the fan exhausts the heat side. Another fan sends the cool side into the frig. I have the same unit, I am experiencing the same issue. I was looking to change out the Peltier modules (about $7 each) and try that. I did find a replacement Control Board is about $45 and if the Peltier change doesn't work this may be my next step.

I recommend that you maybe add more details to your question so it will be easier for Experts to understand the question and answer it.

Switch off, leave 5 mins then switch on again. Check display again.

Small refrigeration units like this one like to fail to cool by developing a small leak and slowly
leaking refrigerant.
THERMOSTAT FAILURE CHECK:
A technician will check the thermostat using using a DMM (digital multimeter). But you can suspect the thermostat if you set the thermostat high and the compressor motor does not run,
then set thermostat low, and the compressor motor also doesn't run - in other words, the thermostat is failing to start the refrigerator's refrigeration system no matter what its setting - an obvious failure of the thermostat.
COMPRESSOR FAILURE CHECK:
If the compressor is dying, you would hear the compressor running almost constantly, but not
sounding quite right (uneven noise, clunking, tapping).
REFRIGERANT LEAK CHECK:
If you unit is low on refrigerant (due to a leak), the compressor motor will be running
almost constantly, but it will sound Ok.

Could be under sized unit or fan relay on unit.

Hello,

What model # do you have? Is there anything working at all like lights, fans, or displays?

Hi and welcome to FixYa. I am Kelly.

This is a 6 or 8 bottle free-standing wine cooler from what I can tell.

I am not having much luck determining if this is a manual defrost type unit or not. Given the inital sales price now of $79.95 I have to assume it is a manual defrost type.

There are a few things that can cause your problem.

1. PTC relay and KliXon thermal overload assy on the compressor.

2. Run capacitor

3. Temp control

You said the fan does not run so I cab not rule out the temp control.

I can not even find a parts break down of the unit.

With no fan running the very first suspect is the temp control but you can at least listen for a CLICK when you cycle it from off to any other position. If you hear a click I would start looking at compressor start / run parts.

If you have access to your units compressor note the manufacturer, hp if stated (1/8hp etc) and Model number.

Then call or visit your local appliance parts supply store with that information in hand. The will have a PTC relay / KilXon thermal overload AND run capacitor that will fit your unit. I am pretty sure that will get you going again UNLESS you have a broken wire somewhere.

The replacement parts are going to run about 50% of the cost to replace the whole thing.

Thanks for using FixYa!

Kelly

If the unit is a thermoelectric unit it can be the cooling system.
If the unit is a compressor unit it will be the thermostat.