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Equipment fault with iced up coil

Resolve a longstanding issue with a case that was suffering from icing up. On first observations of the data it had a low evaporator temperature during a defrost, the evaporator temperature was only just rising above zero. This was causing the case to ice up after several days of operation.
Although the case was iced up it was still able to maintain a product temperature initially (and anyone probing the case at this time would see it as ok at this early stage), however eventually it would not be able to maintain the required temperature and put the food at risk, whilst also using far too much energy in trying.