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Hello,
I have EXACTLY the same issue as listed above on a friends Beko CDA543FW 2 unit. I also remain a little confused from the text given above. The fridge freezes everything within it over a period of time. I am not a white goods Engineer, but I am an Electrical Engineer. I am therefore familiar with thermistors ( sensors ), control boards, evaporators, and the principle of operation of the fridge / freezer. I am to understand that this model does not contain an air sensor. The two sensors in the freezer section are the evaporator sensor, and the defrost sensor. The only sensor which controls the temperature is the thermistor buried within the rear of the fridge foam. This is connected to the control unit via the orange / grey wires, and connect to the KN3 termination in the control box. When I test this with an ohm meter, it measured 5.88K ohms. I think that this is acceptable, and therefore working. Nevertheless, I have not yet tested it with a milli volt meter to ascertain if a change in resistance takes place when cooled. That involves digging the rear of the fridge out to gain access to it. Initially, when we gained access to the freezer section, the hole at the bottom of the evaporator was frozen up and blocked. That blockage was removed. The fan runs continuously. I have checked both the resistance of both of the sensors within the fridge section, which BOTH show O/C. Clearly not right. I need to check them using a better meter. ( it was only a cheap friends meter I had access to at the time ). If necessary I need to remove insulation from the wires at the sensor end, to confirm that the wiring between the control board, and the sensor is sound. Having looked on the spares sites, it insists that one of the sensors is a ‘thermal fuse’. I remain unconvinced of this. Please can anyone advise? I am of the opinion at present, that the thermistor and control unit test out OK. However, from what has been said on here, that is clearly not the case. If the sensor buried into the back of the fridge is the only temperature sensor control, it is either that thermistor, or the control board that is faulty. Or both. If anyone can offer any further advice, it would be greatly appreciated. Thanks in advance.
