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You'll need to tear into it to answer these questions. I suspect the defrost cycle isn't working or the fan is broken. The best way to see what's going on is to take everything out the freezer drawer and remove it. Then take the back panel off the interior rear wall of the freezer section to expose the coils. The coils should have a very even white frost pattern on them (not frozen solid anywhere). If they are frozen up then the air can't flow around them to cool the fridge properly. If the coils seem "normal" with frost only then is the fan just above them working? That fan circulates cold air to both fridge and freezer sections. Let me know what you find out in order to lead you to a repair part.
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If you have a frost free refrigerator then temp jumps as you discribe are somewhat normal during a defrost cycle. However it sound like your defrost temp may be getting too high. There is a limit thermostat on the freezer coils that keep the defrost temp from getting too high. The part is called a (defrost termination thermostat) and is a round disk about 1 to 1.5 inch in diameter clipped to the top of the freezer coils with 2 wires coming out of it. When cold, it allows power to the defrost heaters. At around 35/40 degrees it opens and shuts off power to the heater. 35/40 degrees sounds high for a freezer temp but that is behind the wall and only for a short time. Yours may be staying on too long or out of temp calibration needing replaced.
Cold air sinks. If evaporator temp is not low enough only the items on bottom of freezer will get cold and possibly freeze - stuff on top will not.
Throw a digital thermometer in there towards the top shelves and I bet your temps are high. Low refrigerant will cause this; furthermore, if you leave the refrigerator door open by accident, the refrigerator will never shut off, the freezer evaporator will freeze over with a block of ice, and the freezer temps will be higher. If that is what happened, simply unplug the unit and allow it to self defrost and then turn it back on for proper operation and make sure that the refrigerator door is properly closed!
it could be that your fridge,freezer setting is not turned up high enough to keep the freezer cold enough.turn it up to setting number 5 at least and if that dont do it u could have a faulty thermostat.have it checked by a engineer.
Door has accidentally been left open. Have missed a proper defrost and ice has built up internally. Switch off and do a 12 hour defrost. then switch on again. (Thats where i would start.).Because fan is stuck in the ice, it cant blow cold air to the sensor. Sensor detects this and shows red error light.
The red light bis indicating that the temp is too high, if you can ,turn the thermostat to a colder setting, if this makes no difference, then you have a serious problem, you will have to call an engineer.
Plz rate this solution,
if i read the english right, the compressor runs but the freezer fan only runs for a short time. no fan then no cooling.
there is a fan stat so that the fan only runs when the evap is down to temp. this may be faulty. also on some hotpoint, the fan switches off when door opened. check door switch operating ok. this may also explain problem with fridge lamp