Question about AEG Lavamat 88840 Front Load Washer

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The wash cycle works, the pump wprks, but the spin will not. There is a high pitched buzz and our overload switch throws out when it hits the spin cycle. I have taken the motor out and the brushes look fine. The bearings seem noisy and should probably be replaced but it still spins freely and smoothly. The washing machine is about 15 years old.

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  • jterrey Apr 11, 2011

    Thanks Ginko. The machine is an AEG Lavamat 538-W frontloader but the website wouldn't accept that and I had to tick something

    The pump works and seems to empty everything, although having read your spin link I must say the contact on the sensor at the base at back of the drum looks a bit corroded. The main motor drives the drum for a wash but fails when the spin comes on. Would worn brushes make the main motor fail under a load?

  • jterrey Apr 13, 2011

    Thanks Ginko, the advice was useful. I can't see any obvious shorts so I'll take the motor in for testing. If the motor's OK I'll look at replacing the CCU or the MCU

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  • AEG Master
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Hi.

If the switch trips off, that means that there is an abnormal power draw, which means a short. If the pump is humming you probably have a defective pump motor. The fact that brushes look OK does not exclude that the motor windings are internally shorting. Remove the pump and read Ohms on pump motor contacts. a shorted motor will read zero Ohms. The definitive test will be done by a tech energizing the motor directly (jumping it), then connecting power. That will probably trip the breaker, telling the tech that the motor must be replaced. For safety reasons I suggest only carrying tests that can be done with power off. After 15 years the pump is probably gone.

For general No-Spin issues, see this: If you have no spin...
In your case the situation is different, I think you have a defective pump motor. If problem is not the motor, then it is either wiring harness or timer (uncommon). In that case the breaker trips immediately before pump starting. Check also that problem is not main drive motor. It may be shorting when spin cycle starts. In that case the pump will drain before going to spin.

Regards.

Ginko

Posted on Apr 11, 2011

  • Ginko
    Ginko Apr 11, 2011

    Hi.

    Worn carbon brushes is not necessarily the cause of the problem , but that tells you that the drive motor is old. The problem is not the carbon brushes. Since the variable speed motor is turning at slow speed, the brushes are still working. The brushes can be tested ensuring that they are touching the commutator (read Ohms) , but in any case when brushes are too worn motor will simply not spin.

    The short may be given by the motor winding shorting. When that happens the whole motor must be replaced (re-winding is not worth and it is not done anymore).

    More commonly the short may occur in the CCU (main control board) or MCU (motor control unit). One of the two boards can short when energizing the variable speed motor for spin part of the cycle. The motor control unit (if present) is in a sealed module inside the washer. MCU connects to CCU and to motor. Since boards are difficult to test, look if there is trace of short in any of the two modules (burnt spots - component melting- smell). If there is none, go back to motor and test it for shorts using a growler: Armature Test ( it can also be energized jumping it at high speed). Check the boards first.

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