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Kelly
Kelly, Appliance Technician
Category: UK Appliance
Satisfied Customers: 11558
Experience:  Highly accurate diagnostician with over 30 years experience!
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Hi, AEG Favorit AA Dishwasher from around 2004. Two uppermost

Customer Question

Hi,
AEG Favorit AA Dishwasher from around 2004. Two uppermost LEDS (of 3) blink, meaning fault in AQUA CONTROL SYSTEM. When dw. is turned on the pump starts working for about a minute, then stops, LEDs still blinking. No water in lower basin (completely dry), checked microswitch on floater with meter, ok. When filled with water from bucket dw. is drained by the pump, so pump works. Have tried pulling out 3-4 plugs going to diverse sensors on the underside, no change, both when left open and when shorted (yes, I am a bit adventurous). Have opened the plastic box in front with control electronics, no funny smell, no visible sign of component failure.
Q1: Is there a reset procedure, like pressing button X and Y while applying power?
Q2: What else can cause this fault beside water in the lower basin raising the floater and thereby closing the "Water high" microswitch?
Q3: Apart from dumping the old dw, do you have a suggestion for further diagnostic and possibly repair?

Torbjorn Sund, Norway
Submitted: 1 year ago.
Category: UK Appliance
Expert:  Kelly replied 1 year ago.
Hi, welcome to Just Answer. My name is XXXXX XXXXX I look forward to helping you! The flood sensor is obviously one reason you would see this behavior, but the control can also cause the same behavior, especially if the flood sensor did activate and was reset. Also, the pressure chamber being plugged can cause the same. Is the plastic chamber on the side of the tub plugged at all? As far as a reset, the best way is to remove power at the mains for at least 2 hours to do a "hard reset" of the control.
Customer: replied 1 year ago.

The flood sensor cannot reasonably be the source of the problem. As stated in my question, the flood basin was completely dry, the microswitch operated as it should, and neither opening or shorting the connector going from the flood sensor made any difference. The drain pump operates as it should. All chambers underneath the tub seem to be properly plugged, but I do not know where the pressure chamber is located or what it looks like. However, it could not reasonably be any over-pressure either, since the condition comes on as soon as I apply power to the dw., before any washing program has started. I have left the dw disconnected from mains for 3 hours, but the fault comes back when I plug it again. It could be a stuck over-pressure sensor, how do I locate it and diagnose it? It could also be a fault in the control electronics, so my last resort would be to replace it.

Expert:  Kelly replied 1 year ago.
On the side of the tub is a plastic tank. Does it look plugged like the picture below?

graphic
Customer: replied 1 year ago.

I hadn't removed the panel on that side, but see it now. It certainly does look as if there is some deposits in there, although they are at the bottom in my case and not at the top as in your picture. There are two thin blue wires coming from the top, looks like some sensor (pressure microswitch?), I removed the connector, applied power and voilà, the fault did not appear. So it looks as though you have pinpointed the problem. What next: Can I clean the pressure chamber, or should it be replaced?

Expert:  Kelly replied 1 year ago.
Well, you can clean it by removing it and getting hot water in there to hopefully break the "gunk" apart, but it will not be easy. That part does not come apart, so it is a labor intensive job. Once that is cleaned, or replaced, you should have restored normal operation.


Please remember to leave positive feedback before you leave. If you have any other questions, please let me know!. You may continue asking follow-up questions until you have all the information you need, even after rating my service. Thank you!

Kelly, Appliance Technician
Category: UK Appliance
Satisfied Customers: 11558
Experience: Highly accurate diagnostician with over 30 years experience!
Kelly and 2 other UK Appliance Specialists are ready to help you
Customer: replied 1 year ago.

Ok, anyway I'll have to remove it, so I will have a go at trying to clean it when it is out. If unsuccesful then I'll buy a new one. Thanks for good assistance.


 

Expert:  Kelly replied 1 year ago.
You are very welcome, good luck! Thank you very much, I appreciate your kind works and excellent rating!
Customer: replied 1 year ago.

I removed the pressure chamber, cleaned it and put it back, but as it turned out the pressure chamber was not the culprit. The dishwasher is equipped with an "Aqua-stop" system, with a magnetic pressure valve at the kitchen sink end of the inlet water tube. After some further investigation I suspected this part, took it out and checked it by applying 220V. No reaction, so I though I'd have to buy a new one, but decided to test it a last time, whereupon it reacted to power. So it was just the valve that had got stuck, and beating a little it with a screwdriver would probably had done the trick, saving me the full disassembly. The user manual could have been more explicit. Anyway cleaning the pressure chamber probably was not a bad idea in any case.


 


And by the way there is a "Reset error condition" procedure, press and hold "Normal 50o" and "Normal 60o" while turning the dishwasher on.


 


In the end your help was more of a moral nature than factual, but thanks anyway.

Expert:  Kelly replied 1 year ago.
Glad you got it fixed, thank you for the update.

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