- This topic has 4 replies, 3 voices, and was last updated 5 years, 3 months ago by
.
-
Posts
-
I have a Beko CRFG1552W fridge freezer, about three years old. When starting up from room temperature empty, currently at about 10-12 degrees C ambient temperature, which it is designed to do, the fridge will get down to -3 degrees and the freezer down to -25 degrees with no problem.
As the fridge temperature setting is increased from min to max, the freezer gets down to -14 to -25 respectively before the compressor trips out, but, with the doors closed, the compressor will not start up again until the freezer has warmed up to around -6 to zero. I have tried a new main PCB but no difference.
There are three sensor inputs on the board, the fridge evaporator thermistor onto KN3, the defrost thermistor onto KN2 and the set temperature potentiometer located in the LCD light fitting also onto KN2. All three sensors appear to be working ok, with the fridge and defrost freezer sensors reading I think about 17k ohms at room temperature, increasing to about 110k ohms on the max, lowest temperature setting.
The set temperature potentiometer is reading about 47k ohms on min setting and 54 ohms on max setting and does reduce the fridge and freezer temperatures ok as the control is turned up. The resistance of the two thermistors rapidly decreases when the fridge freezer is switched off and the temperature rises towards RT, presumably indicating that they are working ok.
There doesn’t appear to be a separate temperature control sensor in the freezer, just the defrost sensor and the thermal insurance sensor with four wires, both clipped to the top of the evaporator coils above the defrost heater element.
The compressor starts up ok and doesn’t run hot, but only when the freezer temperature approaches zero. It seems to be controlled more by the fridge temperature, since when the fridge is warmed up with a small fan heater after being cold, the thermistor in the back wall will cause the compressor to start when the temperature reaches around 12 degrees air temperature in the fridge.
I may have to try and obtain new sensors but I would be very grateful if anyone has any ideas why the compressor will not restart again at maybe -15 degrees, instead of after it has warmed up to at least -6 degrees, which it consistently did once when I tried allowing it to warm up from several different temperatures after the compressor had tripped out, with the doors closed.
Further to my initial comments regarding my Beko CRFG1552W fridge freezer, I have monitored the freezer temperature when the compressor restarts under three different ambient temperature conditions of 5, 10, and 20 degrees C and found that when the ambient temperature is cold at 5-10 degrees C, the compressor only restarts when the freezer warms up to -6 degrees C, whereas in warmer ambient conditions of 20 degrees C, it will restart at a more acceptable -12 to -16 degrees C. Corresponding fridge temperatures on restart are 8, 6, and 4 degrees C with the fridge thermostat set at 3, 4, and MAX settings respectively.
There is no separate temperature thermostat or thermistor in the freezer and the defrost sensor doesn’t influence the compressor to restart if it is warmed up. The fridge temperature, and hence freezer temperature, is controlled by an evaporator coil and thermistor embedded in the back wall, which appears to be working ok as previously described.I would have expected the freezer to have a separate temperature sensor to activate the compressor when bulk food at room temperature is loaded, or when the freezer temperature rises towards zero, rather than relying on the fridge to warm up and activate the compressor.
The Beko fridge freezer is designed to operate at ambient temperatures down to -15 degrees C, but if the temperature rises towards zero, the fridge sensor would not activate the compressor until food in the freezer has started to defrost, unless presumably the PCB circuitry has been designed to avoid this problem.
I suspect that my FF has been operating as I have described since new, but I have not previously noticed slight defrosting of food in wintertime when my FF regularly operates at 5 degrees C.
I wonder if an air sensor placed in the back of the fridge [depending on it’s resistance], and connected to the PCB instead of the embedded thermistor would be more sensitive to temperature change and allow the compressor to start up more regularly and hence keep the freezer temperature down to an acceptable level ? Any comments would be appreciated.An update to my post of last winter when my three year old Beko CRFG1552W fridge freezer, [ which appears to be the same as the current 3552 model ] began to defrost food when the compressor failed to restart until the freezer had warmed up to around -6 to 0 degrees C when operating at an ambient temperature of around freezing point, despite Beko claiming that it is capable of operating down to -15 degrees C ambient temperature [ freezer only ], due to it’s “freezer guard” technology.
New sensors don’t appear to be listed for this model, so recently, as a trial, I tried taping a 4216600385 sensor, [ after checking it’s resistance from +22 to -25 degrees C ], to the back wall of the fridge and connected it to the KN3 input on the PCB in place of the original sensor, but the compressor wouldn’t trip out even though the fridge and freezer attained satisfactory temperatures, so I refitted the original sensor and tried operating the fridge freezer again and due to the summer ambient temperature of 22 degrees C, it worked ok with a fridge temperature of 4 to 1 degree C, top to bottom, and a freezer temperature of -18 to -22 degrees C, with the fridge stat set at No 2.
So it remains to be seen whether it will operate through next winter, but I doubt it unless I warm the under stairs enclosure where it is situated., which is not ideal for economy. In future I would rather buy a separate freezer to overcome this possible problem.
I wonder if anyone else has had a similar experience with this popular fridge freezer which is claimed to operate down to -15 degrees C, such as in a garage or outhouse ?for fridge sensor see
https://shop.ukwhitegoods.co.uk/4394720185-electronic-fridge-sensorand the linked disgrams
for the rest of your model info see table below
Dave
- You must be logged in to reply to this topic.