Samsung twin cooling fridge does not reach desired temp to negative 14..it stayed at 21 so

Controlling the Freezer temperature
The freezer temperature can be set between -14°C (8°F) and -25?C (-14°F) to suit your particular needs. Press the freezer button repeatedly until the desired temperature is shown in the temperature display. Keep in mind that foods like ice cream may melt at -16?C (4°F). The temperature display will move sequentially from -14°C (8°F) and -25?C (-14°F). When the display reaches -14?C (8°F), it will begin again at -25?C (-14°F). Five seconds after the new temperature is set the display will again show the actual current
freezer temperature. However, this number will change as the Freezer adjusts to the new temperature. The top and bottom guards in the freezer of this model are the two star sections, so the
temperature in two star sections are slightly higher than other freezer compartment.

Controlling the Fridge temperature
The refrigerator temperature can be set between 7?C (45°F) and 1?C (34°F) to suit your particular needs. Press the fridge button repeatedly until the desired temperature is shown in the
temperature display. The temperature control process for the Fridge works just like the Freezer process. Press the fridge button to set your desired temperature. After a few seconds, the Fridge will
begin tracking towards the newly set temperature. This will be reflected in the digital display. The temperature of the freezer or the refrigerator may rise from opening the doors too frequently, or if a large amount of warm or hot food is placed in either side. This may cause the digital display to blink. Once the freezer and refrigerator return to their normal set temperatures the blinking will stop.
If the blinking continues, you may need to "reset" the refrigerator. Try unplugging the appliance, wait about 10 minutes and then plug back in.

The refrigerator does not work at all or it does not chill sufficiently.
• Check that the power plug is properly connected.
• Is the temperature control on the display panel set to the correct
temperature? Try setting it to a lower temperature.
• Is the refrigerator in direct sunlight or located too near a heat source?
• Is the back of the refrigerator too close to the wall and therefore keeping air from circulating?

Dado

so your reported figures show that the unit is operating as planned
the closer to ambient temp the shorter it runs for
the further away from ambient temp the longer it runs for
when the desired temp is reached , the compressor will stop but the fan will continue to run to circulate air past the thermostat so that it will switch back on when the room temp reaches too high temp
and that is why it is recommended to set the temp at 25 C as that is the most economical temp to run it at

Model Number?

You have a twin cooling unit and the refrigerator fan is getting clogged up with ice possibly due to a defrost problem. You will need to remove the back wall panel of the refrigerator to access the evaporator fan motor and clean it out of the excess ice buildup. Check the defrost circuits and also the defrost drain to make sure it's clear.

HI THIS SHORT VIDEO MAY HELP">

the fridge will run until it reaches the temp. there should be a differential of 2 degrees so when the temp rises by 2 degrees the fridge should restart so you will need to make sure the differential is set to 2 degrees celcius on controller

the temp controller is bad in the fridge once it reaches cooling temp desired it cause the temp comtroller to go into a shut off mode due to being weak on the temp sensor tube

very common issue on samsung r21 models , repair kits available and plenty of help videos out now

have a look at this youtube video and the chanel it belongs to

Air must circulate in the freezer when working properly. I am guessing the recirculating vent in the freezer may be blocked which would not bring warmer air back to the coil to be cooled. As for the door, I theorize there may be too much negative pressure which pulls the door in while you were pulling out ... don't have solution yet.

probable cause is jammed fan. first take back panel off fridge, electrical connections are plug and socket. yoy may find a quite small build up of ice underneath the fan. melt it off and you should be ok. samsung are prone to this problem