AEG 8081 : Will not power up

[banthevan]

Hello

I set the dishwasher overnight (on Auto Bio 50) and got up to find no lights on the front panel. Opening the door, it had completed its cycle with all contents dry. The power socket checked OK and the plug fuse also. There appears to be no fuse on the control panel boards in the door. On/off button tested OK with power reaching it. The heater seems OK at 22.5 ohm and the door switch is working fine. The Eberle relay (669 808 049) seems fine also.

PNC: 911 232 218
S/N : 92616158

It does appear that it’s the control panel that’s gone and/or some other component has gone and took the panels with it. The 2 PCBs are optically-isolated via IR LEDs and no IR is detectable. No dry joints or heat spots evident on any of the PCBs. There are 3 BT134 triacs which I’ve yet to test properly which could be the problem (cheap to replace).

I’ve got the plinth, back, sides & control panel open with no leaks visible.

Any help with this one is gladly appreciated.
Thanks

[banthevan]

Re: AEG 8081 : Will not power up

I’ve read up that the wax valve that operates when drying should normally be closed circuit when cold. It tested at 998 ohm. In place, it visually appears O.K. and I’ve not checked it internally as yet.

Since it appeared to complete the wash then dry cycle before the machine went dead, would this cause the machine to remain in this state? I suppose a short across the component would test this if the valve should be closed circuit as normal. Anyone had any experience of these wax valves on same or similar machines?

[Penguin45]

Re: AEG 8081 : Will not power up

Bit of an oldie, now. From (distant) memory, the board with the selector buttons on is likely to be the culprit. It’s the ‘power’ board and I think there is a step down transformer on it. Possibly what has failed.

Penguin45.

[banthevan]

Re: AEG 8081 : Will not power up

Went back to this today (after quite some time!) and discovered the control board fuse (T2A/250V sub-miniature, with “V” logo) very well hidden under a large resin blob. The meter across it shows it’s blown/open circuit.

I’ll replace the anti-surge/slow-blow fuse (will get a few, just in case). Also, since it appeared to have done all or part of the drying cycle, I would suspect it’s the drying fan or element that might be responsible.

All responses gladly received 🙂

Cheers!

[banthevan]

Re: AEG 8081 : Will not power up

Replacing the sub-miniature fuse on the control board (next to the transformer) has now brought the machine back to life (nice to see it was socketed and not directly soldered).

With the door open, then switching on the machine, it appears as normal, with all the programs lit up. However, when the door is closed, it immediately sounds like it’s pumping out, with all the control panel program LEDs flashing, with error code “Cd” flashing in the indicator panel, together with “Rinsing”, “Final Rinse” & “End”. The only actions that will cease the pump are switching the machine off or opening the door; turning back on or closing the door starts the pump off again.

The error code brings me back to the wax valve I suspected in my second post. I’ll double-check my findings concerning it but I’m not sure why the pumping does not stop as yet.

Any further help is much appreciated.

Thanks 🙂

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