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Hi all,
Been trying to figure this one out but need some help.
What’s wrong:
The washing machine stops occasionally during its program. It’s not always clear where but usually somewhere during the washing, rinsing or spinning cycle. The symptoms are these:
– Machine is not doing anything.
– There is no error in the display
– There is a time remaining in the display that varies from full cycle time till only 2 minutes left.
– I am sure the machine starts properly and finishes filling up with water etc, so my explanation for the full cycle time remaining is that it somehow resets (this is mentioned also in another topic on this forum from 2006, no solution mentioned unfortunately).
– This behavior has been happening last 6 months and is getting slowly more frequent.
– At the moment 50{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of the wash cycles finish without problems.
– The problem happens with different programs, no clear relation to 1 program.
– During maintenance I did the following:
Checked filter, replaced carbon brushes (they where halfway gone but just to be sure), replaced the rubber seal for the door, checked the heating element (clear as something, no calcium whatsoever), checked general condition of hoses etc, nothing weird that I noticed. Belt of the motor was not worn or damaged.
– When it operates:
It fills with water without problems and in a reasonable time
It pumps the water without a problem
It heats the water without a problem
The motor rotates as it should, wash and all spinning speeds.
– To get it going again when it is stuck:
Pausing it and starting it again does nothing. Only the led changes from continuously lid to blink and back.
Moving the dial to a different position does not help
Moving the dial to off and restart a program always helps. The machine pumps out the water and starts it program without anything else being changed.Machine info:
AEG Lavamat
Type: 74530W
Prod nr: 91400204403My diagnosis (for what it is worth).
The program seems to get into a state where there is no progress but nothing is wrong either. When I worked on the machine I noticed the control board and a separate timer module. The timer module looked mechanic where it rotates slowly. This is the part I suspect. After 10 years it might be worn out and gets stuck without the control unit noticing it. It’s like time stops for the machine. I’m not sure however if this is indeed how it is designed and if the module I am talking about is indeed a timer module.Any advise is appreciated.
Peter.
Re: AEG Lavamat 74530W stops during the program without erro
It is likely to be a board problem OR the connections between the two boards by the sound of it. There’s no way of testing which other than by using the ‘poke & hope’ technique.
Re: AEG Lavamat 74530W stops during the program without erro
Hi Martin,
Thanks for your quick reply.
What 2 boards are you talking about. Is the control unit consisting of 2 boards?
(I haven’t had a good look at it yet)And what about the little square box that is located directly above the drum unit that I call the timer component? What does that do?
Thanks for your advise.
Re: AEG Lavamat 74530W stops during the program without erro
There’s a main board and a programme board, both reliant on each other. I suspect the “timer” to which you refer is the programme selector switch.
Re: AEG Lavamat 74530W stops during the program without erro
Martin,
Some additional info.
The part I am curious about is #12 in the exploded view drawing on the AEG website. It’s called Pressostat. What does that do?
And then you have #1, the Timer. Could that be related?
Re: AEG Lavamat 74530W stops during the program without erro
#12 is the water level device, #1 the programme selector switch. Not related in this instance.
Re: AEG Lavamat 74530W stops during the program without erro
Ok Martin,
Thanks.
I will poke around and see if I can provoke anything during a cycly (being careful off course!)I will focus on the control boards and look for bad connections.
I will come back here if I find anything.
Peter.
Re: AEG Lavamat 74530W stops during the program without erro
Hi all,
Took a look at the control unit and found something.
Looking at the print, it looks like there is heat generated by some components. They look oxidated, like a black residu is covering them.
It is surprising to me the thing is still working.
So I have a couple of options:
– get a new control board (expensive).
– get a used control board (are those available?)
– repair it myself by soldering some relacement components on the board (need to know what is wrong first)So, to start with the last option, anyone interested can take a look at my pics and a movie of the board on Google Drive, follow this link:
https://docs.google.com/folder/d/0B52Wm … VjWEE/editI am interested in what components mgiht cause this behavior. They all like very common electrical components (resistors, capacitors, transformer). Easy to obtain and replace. Question is which one is causing this?
Anyone?
Re: AEG Lavamat 74530W stops during the program without erro
fixitall wrote:– get a new control board (expensive)
You could do that but you will also need to know how to enter the correct configuration code to get it up and running.
The other option worth serious consideration is : buy a new machine!
Re: AEG Lavamat 74530W stops during the program without erro
Hi all,
Some interesting information for those who like a challenge…
After posting the pictures of the blackend circuit board, I decided to clean it with some alcohol and a brush. I was surprised how that turned out. The board and components looked like new! I was expecting evidence of excessive heat, decolorization of some sort. But no, none of that. Everything looked in perfect condition.
So I send the pictures to a colleague of mine who is a wizard in electronics and this was his take on it:
– The circuit that looked black is the power circuit of the board.
– It is controlled by the IC called TOP209 in my video.
– The ELCO’s (Electrolyte Capacitors) on this board tend to go dry in time so after 10+ years they don’t work as well as the y should. The effect is that the power circuit gets vulnerable for external spikes (sparks from a switching microswitch, etc) and the voltage of the power circuit can momentarily dip below the nominal voltage……
Resetting the timer or causing other kinds of weird behavior.His advise:
Clean the board well (already did that)
Replace the ELCO (Electrolyte Capacitors)on the board.So that’s what I am going to do.
I will you guys (and girls) know how many washing cycles are finishing without problems (hoping for 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d}).
Re: AEG Lavamat 74530W stops during the program without erro
Oh, and for those that wonder why the circuit was black:
Dust is attracted by the magnetic effect of the transformer and the current that runs through the circuit.
Since the dust was black, it might be of the carbon brushes of the machines motor. They are located all the way at the bottom but still in the same ‘room’. So 10+ years is probably enough to have a decent buildup.
It makes sense why it comes of with a little alcohol.Solved: AEG Lavamat 74530W stops during the program
This topic can be changed to ‘solved’
Hey everybody, good news. I resolved the problem.
This is my summary:
– Like I stated before, residue of the carbon brushes was build up as a black coat on the power circuit of the control board.
– Some simple drops of alcohol and a paint brush made it simple to remove it and clean the board properly.
– The carbon coating probably caused some false currents in this circuit, nullifying the working of the Electrolyte capacitors. This made the circuit vulnerable for power surges causing an occasional reset of the timer.
– After cleaning the board, the machine ran without any problems. 20 loads with a 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} score and counting.
I think it is safe to say the root cause is found and the problem is solved. Costs made: 0 euro’sIf this information helps you fixing your machine, leave a post.
Peter.
Re: AEG Lavamat 74530W stops during the program without erro
Thanks for this post. I had exactly the same problem with my AEG oko lavamat washer after 13 years and followed your instruction. I have yet to test it. The circuit board was in exactly the same condition as yours. Cleaned it with circuit board cleaner fluid. Incidently the top cover in these machines are slided bacwards after removing the two screws at t he rear. I Will post a new message if it works on test.
Re: AEG Lavamat 74530W stops during the program without erro
Just ran an empty short wash cycle at 60 degrees C with dish washer detergent to clean the machine and it worked perfectly, going through the main wash, rinse and spin cycles without a hitch. The timer count down (which would earlier get stuck ) did its job well. Tomorrow we are going to try the 50 degrees and 40 degrees cycle with real clothes. Thanks again for this post. There are lot of people with these AEG machines with the same problem and have either bought new ones or they have paid heavily to a technician, who probably changed the circuit board, after changing many other things. The interesting bit is that when I tried to find a error code by pressing two buttons and turning the knob one way, I got E61 as the error code and I thought that I had problem with the heater element or sensor and was about to throw out this machine untill I read this article/post here. These machines are other wise built like a tank (and are heavy too). Thanks again.
Re: AEG Lavamat 74530W stops during the program without erro
OK now I have used it in real wash cycle with clothes, both in 60 degrees quick wash and 40 degrees quick wash. No problem what so ever. I am really pleased. I was about to buy a new one for 700 Euros but now I can use that money on some thing else. All you guys with old AEG lavamat that stops in mid cycle, please try this before you change your washer.
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