What is the ideal refrigerator temp on a smeg sr650xa

You don't say ideal temperature of what, but as you posted to refrigerators, the ideal temperature is 3' Centigrade or 38' Fahrenheit.

Freezer is -18' C or 0' F.

possible bad temp sensor

Cheapest way is to buy a simple thermometer and place it inside, do get an accurate one as they can vary a couple of degrees.
3C or 37F is optimum temp for a refrigerator.

Fridge keeps beeping or buzzing: The following is for Frigidaire models but others can be addressed similarly.

Several Frigidaire refrigerator models have an electronic control panel on the freezer door the owner can use to adjust the internal temperature, dispense ice and water and receive notification about issues such as the need to replace a water filter. The refrigerators also emit a beep for various actions and as an occasional alarm. Determining what causes the beeps necessitates some troubleshooting.
Temperature Controls ·A Frigidaire refrigerator's display panel blinks when the control panel is touched to set temperature controls. After pressing "Freezer Temp" or "Refrigerator Temp" on the keypad, press the arrow buttons within five seconds to increase or decrease the desired temperature. If you do not press the arrow buttons within five seconds after pressing "Freezer Temp" or "Refrigerator Temp" on the keypad, the refrigerator beeps to indicate the current setting will stay in place.

Door Open ·When you leave the refrigerator or freezer door open, the refrigerator beeps. Also, the "Door Ajar" indicator illuminates on the appliance's display panel. Shutting the door and pressing "Alarm Reset" stops the beeping and turns off the "Door Ajar" indicator light.
·The Frigidaire refrigerator has a control lock feature that prevents use of its control panel or dispensers when the unit is locked. When the control lock is active, a beep sounds when a keypad or dispenser is pressed. Release the control lock by pressing the "Control Lock" icon for three seconds. A beep will sound, and the icon's light will go out.
Power Reset ·A power reset is occasionally necessary if the Frigidaire refrigerator's control panel does not work normally or a reset function on the keypad does not work. A power reset involves disconnecting power to the refrigerator by unplugging its power cord from the electrical outlet, waiting 30 seconds and plugging the power cord back into the electrical outlet. When the control panel resets, a beep sounds. If the refrigerator beeps even after a power reset and the beeps' source is not known, contact Frigidaire.


Read more :http://www.ehow.com/info_12148688_cause-beeping-noise-frigidaire-refrigerator.html
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Cause of Beeping Noise in Frigidaire Refrigerator eHow

Hi...the same thing has happened to me. My Smeg Fab28 refrigerator compartment has stopped cooling. The freezer still works. There was a build up of ice on the back fridge wall, and the milk was freezing up, so I turned down the temp. After the ice melted, I heard a bang like a bunch of ice had dropped. I turned the temp back up but it steadily stopped cooling even more. I decided to defrost the freezer, and had the power off completely for about 5 hours. When I turned it back on, the freezer worked, but the fridge is not cooling AT ALL.

Did you fix the problem and if so, how?

Thank you
Bev

The higher the number the colder the temp is supposed to be.

In order to prevent the formation of bacteria and other such organisms to affect food the way it does, the ideal temperature range of refrigerators has been mentioned here. Before we look at these settings, it is important to know the format in which temperatures are represented within a refrigerator. Commonly, you will notice a dial representing the figures 1-5 or 1-9 in the refrigerator, and a dial representing the letters A-E in the freezer. The ideal setting is usually in the middle of such figures.

If the dial is in such a format in your refrigerator, try a setting at 3 if the range is 1-5, and at 4 if the range is 1-9. For the freezer, a setting at C is suitable.

The ideal temperature in the refrigerator ranges between 34 degrees F - 38 degrees F or 1 degrees C - 3 degrees C. So that foods such as vegetables and fruits remain fresh and crisp, the temperature may be set around 38 degrees F or 3 degrees C.
The ideal temperature in the freezer ranges around 0 degrees F (-18 degrees C) or lower.
Read more at Buzzle: http://www.buzzle.com/articles/refrigerator-temperature-settings.html

Ideal temp is 34-38 degrees, the vacuum light means the unit needs to be cleaned around the condenser area.

I’m happy to help further over the phone at https://www.6ya.com/expert/gere_bf68e6055dd61249

going the wrong way to make it warmer.

For most freezer sections of a refrigerator, zero degrees F is ideal. -2 to +5 range is acceptable, but the warmer temps will reduce icemaker productivity, while colder temps might make that ice cream as hard as bedrock.