Temperature drops when i open the door

There will be a pair of round 'twist' adjusters mounted somewhere inside the refrigerator. Some are mounted high, on the panel where the flexible door seal sits when the door is closed. Others are mounted on a side panel inside the actual refrigerator. Generally these will be set to the middle position.
*NOTE* If the refrigerator/freezer is full of food it will struggle to get to temperature. It needs to be Empty with the power On for at least 24 hours to get to it's working temperature range.

Does that unit have a low temperature monitor built in? Maybe that is what is making the noise when your temps dip to -10 degrees. Actually, that is great because the lower the temps the longer you can keep food in the freezer so I would not be overly concerned about that aspect. BTW, have you tried to isolate the source of the humming noise?

Your question is a bit ambiguous. If you are using a thermometer be sure it is correct. If you are talking setting the temperature it is explained on page 25 of the manual it gives these instructions:
• Press the Temp button repeatedly until your desired mode is lit.
• Each time you press the Temp button, you change the mode in this order: Meat/ Fish mode (29°F(-1°C)), Cold Drinks mode (33°F(1°C)), Deli/Snack mode (37°F(3°C)), Wine/Party Dishes mode (42°F(5°C)). Initially, the Cold Drinks mode is selected. The refrigerator will adjust the temperature in the Flex Zone automatically to the temperature you selected.
• The Flex Zone Temp. Display may change depending on the number of items inside, where they are located, the ambient temperature, and how often the door is openend.

I hope that helps.

On the fresh food side you have it set at the proper temperature. Most thermostats have a scale from 1 to 7 or 9. If you set the thermostat at 5 this equates to about 37 degrees. Thermostat do lose sensitivity after a while and need to be replaces. The switch inside the thermostat wears out and the sensing bulb sometimes loses the fluid inside the sensor and the thermostat stops controlling temperature. So sounds like you have it set properly.

I believe what your experiencing is the 75 degrees is the hold temp position...the display then reverts back to the actual room temperature...it doesn't mean the set temperature changed back to 65 degrees. Try to reprogram the thermostat schedules, and try not to use the hold function...just the temporary hold. (which is bumping the programmed temperature up or down until the next programmed period)

1. The first thing you must know is that your refrigerator should be set at 37-38 degrees. Anything at 40 or higher and you are risking food born illness (food poisoning) or spoiling your food. Place your magnetic thermometer in the refrigerator.

2. Set your dial on your refrigerator to the second lowest setting. (If your refrigerator is already equipped with a digital thermostat, simply set it for 37 or 38 degrees and do not move on to the next step)

3. After 2 hours, check your thermometer reading. If your reading is 38 degrees, there is no need to go higher and you are ready to put your groceries in. Be sure not to open and close your refrigerator during these two hours or your temperature reading will be incorrect.

4. If your reading is higher than 38 degrees, move your dial up to the next coldest setting and repeat the steps every two hours until you reach the correct temperature for your refrigerator.

5. Once you have reached the correct refrigeration temperature for your refrigerator, place the magnetic thermometer in the refrigerator permanently and watch for changes.

Typically, your refrigerator temperature will need to be adjusted with the seasons, a higher setting in the summer and a lower setting in the winter.

Hello,

By keep your refrigerator or freezer too cold, it unnecessarily wastes electricity. The recommended temperature is 37 to 40 degrees for the fresh food compartment of the refrigerator. The recommended temperature for the freezer compartment is 5 degrees. If you have a separate freezer for long-term food storage, it should kept at 0 to -5 degrees.

The following steps below is how to set the temperature of your refrigerator.

The first thing you must know is that your refrigerator should be set at 37-38 degrees. Anything at 40 or higher and you are risking food born illness (food poisoning) or spoiling your food.

Step 2
Place your magnetic thermometer in the refrigerator.

Step 3
Set your dial on your refrigerator to the second lowest setting. (If your refrigerator is already equipped with a digital thermostat, simply set it for 37 or 38 degrees and do not move on to the next step)

Step 4
After 2 hours, check your thermometer reading. If your reading is 38 degrees, there is no need to go higher and you are ready to put your groceries in. Be sure not to open and close your refrigerator during these two hours or your temperature reading will be incorrect.

If your reading is higher than 38 degrees, move your dial up to the next coldest setting and repeat the steps every two hours until you reach the correct temperature for your refrigerator.

Step 5
Once you have reached the correct refrigeration temperature for your refrigerator, place the magnetic thermometer in the refrigerator permanently and watch for changes.

Typically, your refrigerator temperature will need to be adjusted with the seasons, a higher setting in the summer and a lower setting in the winter.

Hope this helpout and take care.

If your reading the display temp , your reading what the thermistors are telling the control board . NOT the actual temp inside . After closing the door , from the food that was already cold in the fridge , the coldness will keep the inside temp , the same temp as when you opened the door . The thermistors themselves will detect the warmness and send it to the board . A good way to try to put this acrsoo , is to put a thermometer between , say , 2 packages of salads . Wait a little while and open the door . Watch the display temp , then read the thermometer between the packages . The thermometer will stay the same , due to the coldness of the packages not changing . When you put food in the ref , the surrounding food will give off some of the coldness to the freshly installed food , thereby makeing it cold faster . After a while , this coldness will return to the thermistors and the display will start to drop in temp . Hard for me to put into words , except for , the temp reading will actaully be the same as the actual temp display , only when you FIRST open the door .

see if the back wall inside of freezer have ice if so you have to change tiker board or check your doors if closing

The 37 degree reading you're seeing is the temp. setting, not the present actual temp. When it jumps back to 22-25 its telling you what the actual temp is inside the refrig....simply wait about 24 hours. It should then read about 37...that is, the temp you set it at 24 hours previously.