METHOD OF DEFROSTING A FREEZER CABINET

A method is provided for controlling a defrost process in a freezer cabinet 1 having an evaporator heat exchanger 11 for cooling air within the freezer cabinet 1 and an evaporator fan 5 for drawing air across the evaporator heat exchanger 11. The evaporator heat exchanger 11 is a part of a refrigeration circuit 4 for cooling the freezer cabinet 1. The method comprises switching the refrigeration circuit 4 from a cooling mode to a defrost mode to warm the air within the freezer cabinet 1; and whilst in the defrost mode: measuring the temperature of the air at a first location 18 within the freezer cabinet 1 remote from the evaporator heat exchanger 11; switching the evaporator fan 5 on to draw air over the evaporator heat exchanger 11 if the measured temperature of the air exceeds a first switching temperature; and switching the evaporator fan 5 off if the measured temperature of the air falls below a second switching temperature lower than the first switching temperature. A refrigerated display system configured to perform the method is also provided.