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So if the freezer side is working fine, you have two possible items that can cause your problem. Either your refrigerator thermostat is bad or your damper assembly is bad. Both parts are located in the upper back left corner inside the refrigerator section. To determine which one is the problem, just listen to the refrigerator and see if the refrigerator continues to run and try to cool even when the temperature is raising up to 49 degrees. If the refrigerator keeps running, then replace the damper assembly because it's not opening up to allow air from the freezer to get into the refrigerator so it can cool down properly. If the refrigerator just shuts off and nothing is running when it warms up, order and replace the thermistor sensor (refrigerator thermostat) because it thinks it's at the right temperature inside the refrigerator even though it's not. Below is a link to both parts.
CLICK HERE for damper
CLICK HERE for thermistor
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So I really couldn't say and neither can you until you actually see what it's doing when it's 45-49 degrees. It has to be failing for you to know which one is causing your problem. Then you just need to determine if it's 100% silent or if it's running. If it's silent, then you need a new thermistor. If it's running, then you need a new damper.
If you had a defrost issue, the freezer would thaw out. You said the temperature is fine in the freezer. There also is no defrost timer on this unit. The defrost timer is built into the display board at the top of your refrigerator compartment.
And if you don't want to wait for the unit to fail again so you can listen and see which part is bad---then just order both parts and replace them both to make sure the problem is fixed.
It does not. I have already told you what needs to be done. If you don't know the answer to whether it's running when it's too warm (48-49 degrees) then you either have to wait for it to happen again or replace both parts. I'm not sure I can be any clearer about this.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?