We have an AEG fridge/freezer combination with Santo 'fuzzy logic' temperature control. It has controls on the front for adjusting the fridge and freezer temperatures, with a digital readout giving the set and actual temperatures. I had reason to measure the fridge temperature recently, and found it much higher than indicated on the digital readout (I used both a mercury-in-glass thermometer, and a K-type thermocouple with electronic meter, and left them overnight to stabilise). With the set/actual control reading 3°C, in reality it was only getting to 7°C, too high for my liking. Turning the control to minimum (2°C), only brought the temperature down to 6°C, still a bit high (I would like 4°C). The problem seems to be with the electronics interpreting the signal from the temperature sensor, i.e. it sees 6°C as 2°C.
The freezer section suffers in the opposite direction: it's set to
-18°C but actually stabilises at -23°C. I'm not too concerned about this, because I can simply adjust the set point to a higher value, say
-15°C if I want it less cold, but I can't persuade the fridge to get any cooler.
Can I adjust something so that the internal and indicated temperatures are the same, or at least closer together? Where are the control electronics located, and how do I get into them? Can anyone advise?
(The fridge/freezer is located in a utility room, away from heat sources, and with plenty of air circulation around the back. The two compressors are not running flat out, but cut in and out as normal).