We have now acquired a freezer thermometer, and tests have shown that the reading on the casing of the freezer is accurate, and matches the internal thermometer readings.
I have now switched the settings to -24C and the empty freezer has been running at that temperature for two days.
We have now transferred the freezer goods back into the cabinet and after two days the temperature is showing -11C.
It is obviously possible that the temperatures in the other freezers are not so low, hence there will be a delay whilst the goods adjust to the AEG freezer, but how long is it reasonable to wait for the operating temp to go down to match the setting of -24C ?
It is now 4 days since we loaded the freezer and the temperature is registering between -9C and -11C still. What is wrong and Is this food safe to eat?
You still haven't answered my question. I sent you two replies and you haven't even acknowledged them.
The Freezer has now finally got down to -24C, but it took 6 days to get there. Thanks for your help. We shall watch it closely in future.