Samsung RS21 - front panel blank?

The readout panel on my Samsung RS21JLMR side by side fridge freezer is blank. There is aflashing 'dash' '-' at the top right hand side of the fridge temp readout but nothing else. The fridge and freezer are both cold and the interior lights work but I'm not sure whether the cooling system is actuallly working - it's not making any noise when I open the doors


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