Display says hi temperature, wont change when i

Check underneath the refrigerator to see if the coils are clean. If they are covered with gunk, clean them.

Next, check the operation of the compressor (close to the coils mentioned above) and the compressor fan (also near the coils toward the rear of the refrigerator). Both of these must run for the unit to have the proper level of cooling. If the compressor fan is not turning, you will need to replace the fan motor.

Another possibility would be an inoperative evaporator fan inside the freezer unit. However, when this fails, the freezer often remains adequately cold at the top. The refrigerator part does not get cold enough.