So I was told by one repairer over the phone to disconnect the power for 24Hrs to let any ice thaw - there was a suspicion that the build up of ice was causing the cold air distribution to fail. Despite no visible ice (one of the selling points of the freezer was that it did not allow ice build up and this negated the need for periodic defrosting) we did as advised. About half a cup of water was visible on the floor at the back of the freezer following this exercise. We then switched it back on and the fridge freezer gradually made its way down to the set levels (-19 and +3). So it appeared to be working again :-).
So we put a fridge/freezer thermometer into the middle of the freezer to monitor the temperature roughly each hour. What we say was interesting - the freezer temperature varied from about -18 to -25 and for one reading dipped to -16. At all these points the display continued to show -19. The fridge temperature appeared to stay more stable. So my questions are:
1. Should the ambient air temperature inside the freezer vary this much over a 24 hour period (there has been no sun shinning on it, our room temperature is maintained at a constant level and we only open the door very briefly once an hour to do the temp check)
2. Is this variation in temperature the method it uses to keep the Fridge Freezer frost free?
3. Why does the displayed temperature show a stable figure when the ambient air temperature inside the Freezer is varying?
4. If this is a fault, what is the likely cause - thermostat, controller board, something else?
