Need Appliance Repair Help? Ask a Technician for Answers ASAP
The first thing you'll need to do is pull everything out of the freezer and remove the lower back panel inside the freezer. Look at the silver evaporator coils behind this panel and are the packed with frost, lightly frosted from top to bottom, some frost on top but not on bottom, not frost at all, etc... ? Also, is the fan above the coils running?
OK so that would be your problem. Make sure the fan above the coils is running and if not then replace the fan motor. If the fan is running but there is a lot of frost build up on the coils, the fan can't circulate the air properly. That means that your unit isn't defrosting properly anymore. You'll need a multimeter to determine which part has failed, but if you have a multimeter you'll need to test continuity through the defrost heater which runs along the bottom of the silver evaporator coils as well as the defrost thermostat which is the 1" round device clipped onto the top of the silver evaporator coils. If either part doesn't have continuity, replace it. If both parts have continuity, the display board at the top of the refrigerator has failed and isn't telling the unit to go into defrost properly because the display board is what controls the frost.
OK,I'm logging off for the evening but you should have all the information you need so good luck to you.
If you don't know how to use your multimeter, you will need to have a technician come out.