Compressor will not stay on no matter the temp. setting. After running a couple of minutes the unit emits a scraping or buzzing noise and compressor goes off.

Often replacing the temp relay and current relay on the compressor will solve the issue. You can buy what is called a 2 in 1 compressor control... easy to install and inexpensive. It just may work!

Does the noise happen when the room is in cooling? Is it a three phase compressor? It could possibly be the compressor running back wards. Over charged with refrigerant. Non considerable s in the refrigeration system.

Sounds to me like the bearings are going bad in the motor. The hotter it gets the grease breaks down and the squealing starts.

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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.

It is probably the compressor humming. They can make some funny noises especially on start for a while. If the unit is not cooling it may be the start capacitor or the comressor may be locked up.

Keep a close eye on your temp in the refrigerator and freezer. this noise sounds like your start device on your compressor and if it is, your refrigerator is has already stoped working.

It could also be the ice maker water inlet valve, calling for water, (( there could be a couple of reasons this can happen.

I would first sugest to turn off the ice maker and pull the machine out so you can get to the rear bottom of the machine and listen for the buzz noise. if it is still making the noise and is by the compressor ((( the big black thing ))) then you have a 50 - 50 chance that you will only need a start device. It is worth the shot. But it could also be a bad compressor.

the buzzing noise your hearing is possibly your compressor trying to start up. this is generally a buzzing for 5-7 seconds followed usually by a click noise if it goes on for several hours you will notice the temps in the unit starting to rise. for alot of may tags with the tecumseh compressor the compressor had to be replaced. if it has an embraco compressor you can just replace the start relay on the compressor. let me know what you find thanks Peyton

i would invest in a new unit the cost to get this one repaired will add up and theres no guarantee they will fix the problem

i don't know jennair specifically being from england.
however, there is often a fan inside the back panel and the noise you heard was the fan hitting ice. the reason now not heard and fridge not working may be that the ice has built up so much the fan is jammed

The buzzing is your compressor trying to start. It is going off on internal overload caused by heating up of the motor windings.If you have an amp meter you could check the amp draw of the comp against the locked rotor amps listed on the tag You could try to have someone test your run capacitor, which looks like a can. Could be round or oval with wires coming off it. Or try a hard start capacitor and relay to bust it loose if compressor rotor is stuck. If that doesn't do it the comp is bad.