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AEG fridge/freezer model SCT71800S1. The fridge temperature is current set at 5C but there is what I consider to be too large a variation in temperature between the top and bottom shelves. Fridge is currently just over half full, no goods pressed against door, sides or back. Fridge is situated in the kitchen away from sources of heat, is floor standing and has room for ventilation all round the cabinet. Both doors appear to close tightly. Top shelf goes as high as 9C whilst at the same time the bottom shelf is -3C. Freezer is set at -18C with bottom shelf around -19C and top shelf -23C.
My issue is predominantly with the fridge. This is a ‘frost free’ fridge/freezer, and on the face of it appears to be working ok. But the huge variation in fridge temperature currently means we can’t leave perishables on the top shelf and nothing is put in the bottom because it’ll freeze solid.
Anyone any ideas what’s wrong?
Re: Temperature varies too much.
Try a 48 hour defrost as it may have built up too much ice that the defrost cannot get rid of.
Empty the fridge and freezer and turn it off and leave the doors open for 48 hours,
When you turn it back on after about 4 hours it should be back to normal.
If that does not cure the problem then the fan may be faulty.
Bob
Re: Temperature varies too much.
Thank you Bob. This is fairly new fridge – we’re talking about less than a month old. Two engineers have been out to it, and are stumped. I’m due a third visit next week.
I suppose it’s possible for it to get frosted up in that time, but it doesn’t get huge usage as the kids don’t live here anymore!
The fan is evident in the freezer compartment; I can feel it blowing cold air. But I don’t feel any air movement in the fridge. Would the fridge have a separate fan?
Re: Temperature varies too much.
Make sure that the furniture door is not closing before the appliance door.
If the woodwork is making the appliance door stand slightly open the freezer will ice up.
Once iced up it will not be able to clear itself and will need a manual defrost as Bob says.Steve.
Re: Temperature varies too much.
If you have the door open for the fridge the fan will stop so you will not feel any air coming out of the vents in the fridge.
If it has a light switch then you need to press it in to see if air comes out of the vents.
If it has no light switch then you will need a magnet to test the fan.
Normally you need to put the magnet under the display, move it along until the light goes off.
Bob
Re: Temperature varies too much.
I have just looked at a picture of your model and this model has a separate fan in the fridge.
It may be a fan problem or a refrigerant problem.
Check to see if the compressor motor at the back is running hot if it is it may be low on refrigerant as this model has a wet wall and controlled by a diverter valve.
Bob
Re: Temperature varies too much.
Many thanks for replies folks.
Fridge is free standing, so no wooden framework, etc., to foul the doors. I have checked the fit of the doors, and they both seem ok.
Ok, with freezer fan definitely running, magnet in place so the light is out, I hear no fan and feel no air movement inside the fridge.
Am I right in assuming fan/air movement emanates from the top by the Dynamicair device?
Would I expect the fridge fan be running the whole time the freezer fan is pumping air?
Re: Temperature varies too much.
No the fans on that model operate indipendently.
If you go to the settings and set to coolmatic for the fridge section to see if the fan works.
Bob
Re: Temperature varies too much.
Selected Coolmatic, clicked on OK, applied the magnet and waited. And waited, and waited… Nothing. Could hear the freezer fan running, but no sound and airflow detectable from the fridge at all. I take it the Dynamicair box at the top of the fridge is where I’d expect fan noise to emanate from, and also be able to feel airflow?
Re: Temperature varies too much.
Bob, you mentioned that you viewed a picture of this model of AEG fridge/freezer and determined it had separate fans. I’m taking it this is in some kind of workshop manual or similar. Is this something I can freely download, or is it purely available only to engineers in the trade?
Re: Temperature varies too much.
I just googled your model and looked at the photo of your model.
Bob
Re: Temperature varies too much.
A lot of the newer AEG models use the same system.
It points to a faulty fan motor in the fridge as this fan works to circulate the air in the fridge section and would then not cool correctly in the fridge the coolmatic is for fast cooling of the fridge and normal setting the fan works automatically as it is required.
On the older models it took the cold air from the freezer and only had one fan fitted to the freezer.
On your model it has a wet wall fridge and operates indipendently from the freezer.
It uses a changeover valve in the refrigeration circuit.
When the engineer calls ask him if he can check the fan as it may be a fan problemBob
Re: Temperature varies too much.
I did manage to find a supplier who had a spare parts diagram which appears to show the two motors, and I certainly can’t seem to make the fridge fan revolve.
Thank you again for all your help.
Re: Temperature varies too much.
Engineer called, and changed the pcb behind the control panel at the top of the fridge. I questioned him about the fridge fan. He attempted to open/remove the enclosure housing the fan, but failed to do so. But he said you could feel it running by touching the Dynamicair enclosure. Sure enough, I felt a small vibration which one might expect from an electric motor, but I told him I could feel no passage of air, and that perhaps the motor was either stalled or the impellor was loose on the motor shaft. He made no comment.
After giving the fridge 48 hours to settle down after the board change, the only difference I could detect was that the temperature in the bottom trays now only went down to only -2C !
As a test, I positioned an 80mm 12v computer fan horizontally under the Dynamicair enclosure so that it was gently blowing air downwards. Within 15 minutes, top and bottom temperatures had narrowed to within about 5 degrees.
Complained at length to Currys and AEG, and eventually got hold of a helpful person who agreed that the whole fridge/freezer should be replaced for a new one. I’m hoping the new one will solve this issue…
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