AEG Lavamat 86820 Update Error C9 after brush replacement

[plasgourgues]

Hi everyone.

I’ve got an AEG Lavamat 86820 Update which originally got an error C9. I ordered replacement brushes (2 sets since I’m in Australia and thought I might as well have a spare set) and when they arrived they were slightly too narrow as described elsewhere on the forum. I stupidly thought they would just wear a bit faster and used them despite noticing they were too thin.

The machine worked well for about 4-6 weeks before the error C9 came up again. When I checked the brushes one was almost worn out but the other had completely worn through and the spring had been dragged partly out of the carrier by the commutator. There is some minor scoring and lots of discolouration to the commutator. The carrier had also been melted on the sides.

I thought I could use the second set of brushes to get the machine going again while I ordered the complete assembly with the carrier. When I fitted the second set of brushes and cleaned the commutator with a commutator stick the motor won’t operate and eventually the C9 error comes up. It seems to sit without the motor functioning for a long time before this happens though.

It’s an FHP motor and I can check the motor part numbers if needed. I’ve removed the cap on the hall effect sensor and noticed that the magnet attached to the end of the armature is very weak and has uniform magnetism around it’s circumference. Is this correct? I’ve also measured the resistance across the brush connections and it’s approximately 6-8ohms in all positions as the motor is rotated.

Is it likely the heat from the brush arcing has damaged the hall effect sensor in some way? Or is it more likely it has damaged the motor drive PCB? Is there more testing I can do to establish what is likely to be causing the problem?

Thanks very much for your time.

[iadom]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Hall effect sensor,??? What you seem to be describing is the tachometer, yours is probably OK but I fear the dodgy brushes have damaged the motor and very likely the main pcb as well. 😥
A visual examination of the main pcb for blown components is called for.

[plasgourgues]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Thanks for the reply. I assumed it was a position sensor for the motor drive. Good to learn the more about these things.

That’s very bad news if I’ve stuffed the machine 🙁 What type of damage could have occured to the motor and how should I test for that?

I’ll take the PCB out and check for obvious damage and go from there.

Thanks again for your help.

[iadom]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Most motors have an overload in them, sometimes it can be changed, sometimes it is embedded in the motor windings, safe to say that when the overload goes it usually means the motor itself is in poor condition. You can test for continuity between the various motor pins, if you find a pair that are O/C then that points to an overload failure. You can also test for low insulation, especially on the armature.

[plasgourgues]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Thanks for that. When I was doing the initial testing I measured the resistance between the brush leads and slowly turned the armature. It measured 6-8ohms all the way around but the brushes seemt to bridge 2 segments of the commutator so there may still be a faulty coil. I’ll measure each one individually tonight and also pull out the PCB’s for visual inspection.

[iadom]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Don’t forget to check the armature for low insulation as well. 😉

[plasgourgues]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

It may be that I’m making a stupid mistake in my assumptions but I think the motor is stuffed. I’m only measuring 1-2ohms between any two commutator segments (side by side, quarter points, opposite, all seem the same) and I’m guessing this is likely to mean the insulation on the armature i stuffed?

Commutator segments shown here:
http://www.flickr.com/photos/8764873@N04/8530175127/

Also what I’m assuming is the motor controller/driver seems to have overheated. The plastic cover that sits behind the PCB is scorched
http://www.flickr.com/photos/8764873@N04/8530172255/

The back of the PCB is a bit scorched and it seems to have exposed some of copper of one of the tracks.
http://www.flickr.com/photos/8764873@N04/8530172975/

The blue resistor and second square silver and black (resistor?) seem to be the components in the scorched area
http://www.flickr.com/photos/8764873@N04/8531286760/
http://www.flickr.com/photos/8764873@N04/8531286106/

There is a lot of carbon brush material all over the board that makes the whole thing look scorched but I’m pretty sure it’s only a small area under the components listed above.

Since resistors are usually pretty resistant to abuse and heat I’m thinking I might just replace the motor for now, if my assumptions above about it being stuffed are correct, and I’ll desolder the components in the scorched area and replace them if the new motor won’t work. Is this a bad idea? Do I risk burning out another motor? Anything else I should do first?

Thanks again for all your help. I wouldn’t have had a chance without your help.

[Martin]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

The motor looks reasonable but BOY are they costly to replace. So I would clean up the burnt dry joints and resolder them securely first then see if that cures? Your photo’s are very dark by the way do the house lights need sorting as well? 😉

[plasgourgues]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Thanks Martin. So the 1-2ohms between adjacent commutator segments isn’t a sure sign the motor is stuffed? After sending my last post I started searching for motors online and chocked. I REALLY hope the motor is OK…..

[iadom]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

The gaps on the comm look a bit dodgy to say the least. 😥

[plasgourgues]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

The saga continues 🙁 I repaired the issues above and had the machine working perfectly. I used isopropyl alcohol to clean the commutator and left it unused while I waited for the correct brushes to arrive which I ordered from this site. My house mate came home and tried to do a wash after about a week and it tripped the house RCCB. I pulled the back off and it seems the motor seized. I’m guessing the alcohol flushed the lubricant out of the bearings. It was easy to get it spinning freely again but now whenever I turn the machine on I get nothing displayed and it trips the RCCB. Is there anything I can do from here?

[iadom]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Fit a new motor. 😉

[plasgourgues]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Thanks. I’d just reached the same conclusion. After further testing the motor is what’s leaking to earth. I’m guessing there’s no way to reset/repair this? Is the motor likely to have taken many other components out with it when it died?

[iadom]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Not really possible to test until you fit a new motor other than a visual inspection of the pcb for obvious damage.

[plasgourgues]

Re: AEG Lavamat 86820 Update Error C9 after brush replacemen

Thanks very much for the help. Is the UZ 112 G 70 interchangeable with any other FHP motors with similar codes? For example the UZ 112 G 63? My motor seems to be particularly hard to find.

[Author]

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