Good afternoon Mick - if you put the appliance on fast/super freeze does it then get down to the correct temperature?
OK is the compressor at the back hot to the touch and which refrigerant is it using R134a or R600a which will be on the label on the compressor?
OK let me explain, if you hit the super freeze this bypasses the thermostatic control and causes the system to run without control. If this doesnt cause the temperature to drop then you have either got a shortage of refrigerant or there is a problem with the compressor. Without getting access to the compressor you wont be able to diagnose the problem.
It can be added if you have the necessary refrigeration tools to do the job, but a lack of refrigerant or a faulty compressor cause the same sympthoms ie a failure to reach the required temperature.
Whats your full ENr of the product from the rating plate inside the fridge door.
Thanks give me a moment
Part number for the compressor (if needed) is 00144639 - available and in stock at Neff. would you now kindly rate the information given by selecting from the star rating system at the top of the page, once done all further information requests are free of charge. Thanks for using JA and have a great day - Ian
Many thanks come back to me if you require further help - Ian