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It may be time to finally put the AEG washing machine we’ve had since 1999 to rest, but in case not…
There was an odd bang earlier today, and a C9 error code. I cleared that, but after putting it on a new cycle noticed the drum wasn’t turning.
I took out the motor, jumpered the terminals onto a mains lead and found it to ran OK.
I then took out the controller PCB, and found a disintegrated track near the connector to one of the field winding pins from a relay. After soldering a wire in to replacement it I reassembled things and watched the machine on a short spin cycle.
It started off OK, but after a while there was another fizz-bang. I suspect this is when the machine was about to go from “warm up, distribution spin” to “full speed”, but can’t be sure. The wire I’d soldered in had survived, which is not a surprise as it is quite a bit bigger than the track it replaced. However, I could now see lifting on another track near the transformer that I hadn’t noticed damage on before, and the mains plug fuse had blown.
I’m trying to figure out what might be wrong. The motor runs OK when fed directly in various combinations across the three field winding terminal, but it (or something else) blows the mains fuse and PCB tracks in the machine. That seems contradictory – if the motor had lost its insulation somewhere I’d expect it to blow the fuse in “standalone” set-up as well.
Any suggestions?
if the motor had lost insulation i would expect the RCD to go if you have one
have you checked the relays for a sticking contact ?
Dave
electrofix wrote:if the motor had lost insulation i would expect the RCD to go if you have one
have you checked the relays for a sticking contact ?
Dave
Thanks
Yes, we have an RCD and its not tripping. I was thinking more of a dead short than leakage though.
I hadn’t checked the relays, but have now. There are two in the area that is showing damage. One DPDT somewhat away from the damaged area and one SPDT right in the path that is lifting tracks. Both make satisfying clicks and disconnect / connect as expected.
The only other suspect looking component also in the path showing damage is a three-legged device labelled T2522MH – possibly a 25A triac from looking around.
My initial guess due to it starting OK but then blowing a little later was that it was having trouble switching from slow speed to higher. Your suggestion of relays makes me thing it may be when the rotation is trying to reverse during the slow “churns” to settle the load before going faster, if I remember correctly what the machine does. Maybe a live / neutral to the motor is being left unswitched creating a short as the “other side” does switch.
I think it’s getting to a point where I’ll declare it dead. I spent time fixing the door interlock on another machine a year or two ago, and then the bearings went. At 22 years I may end up spending time fixing something every few months. It already had two water distributor boards and a 3rd may be about due; pretty sure I did the bearings once as well; its on 3rd set of motor brushes but they look serviceable for quite some time yet.
Many thanks for the pointers though.
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