AEG Santo S3675KA6 resetting

[slug_dive]

I posted a while ago without reply on a problem this fridge is having. On further investigation I think the problem is clear but could do with a more experienced/knowledgeable opinion before making an expensive mistake.

The fridge is 2.5 years old and worked properly until February. Now, when we turn it on in the morning it is fine but usually, by the evening it constantly resets itself, runs for a few seconds and then resets again. Pushing any buttons on the front panel shortens the time between resets.

Now the extra piece of information gained recently. I found that the problem seems to occur whenever the mains supply measured at the wall socket drops below 229V. In the mornings, it is usually up at 233-234. Turning on all the lights and the oven will bring it down a few volts due to the drop through the main fusebox etc. and can often bring on the problem

Since domestic appliances should work down past 210V, this says to me the main PCB is faulty.

Anyone care to comment on this diagnosis?

What am I looking at to get a replacement?

[jonse]

Re: AEG Santo S3675KA6 resetting

Hi there

we have an AEG Santo 2340-8KG Fridge freezer (Dual compressor type presumably with separate control PCBs).

The fridge part seems to be exhibiting the same symptoms as yours did in your earlier post. (Displaying fridge temperatures that were silly – reads 11C fridge temp actually around 0C) It certainly seems that the fridge control board thinks the fridge is a lot warmer than it is. In your case that would result in the compressor running continuously and possibly getting too hot – hence the continual resetting, although I would have thought that a fridge compressor would be 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} duty rated.

As to why

We live on a small island of the coast of New Zealand and the mains voltage here is variable on a good day. Generally speaking when the mains voltage is variable (lights flickering when it’s windy etc) that is normally accompanied by voltage spikes as well. I wonder if voltage spikes or abnormally low voltage are confusing the control board? Or maybe it is just something about the fridge control boards? The freezer part or our fridge freezer continues working fine.

No real answers I’m afraid

Cheers

Jon

[slug_dive]

Re: AEG Santo S3675KA6 resetting

Unfortunately, after two times of asking, it appears that there is no more knowledgeable/experienced person on the forums than myself as nobody was able to offer any opinion on the problems.

I eventually purchased the part (directly from the AEG website) and it arrived next day. The main PCB was only available as an essembly including the box it clips into. It took 10 minutes to change:
remove lower door hinge and door
unscrew top door pivot
unclip front panel
unclip pcb box
remove 4 plugs from PCB
reassemble in reverse order.

Job done and it saved a fortune for either a new fridge or an engineer visit.

[Author]

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