[IanR7777]

Re: Lavamat 74620-W door problems

Thanks for the reply. I have located a service manual now for my machine and I am 99.9{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} sure that the door switch is OK as it completely checks out. (Coil resistances and interlock switches).

I have noticed on other forums that this fault has appeared many times on AEG machines and so far no one has found/published a solution.
(It seems that AEG have sold quite a few door locks in the pursuit of a solution)

I am planning to check out the motor tacho circuit tomorrow.

My initial checks seem to show that when I close the door and select a program I am getting an spurious “shut door command” from the micro-controller. (the close triac fires, with just one pulse)
Why it is commanding a close door without throwing a code makes me think that it thinks its in an operational mode that requires a closed door ?

Unfortunately the service manual does not have the circuit diagram for the control board so I will have to figure it out with a meter.

At £300 the control board is not a viable purchase for this machine. But the machine is in excellent condition, so its worth spending some time.
I have located some second hand boards but they are all on Ebay in Germany !!!

[IanR7777]

Re: AEG 88730 C6 fault

Just a guess but some AEG machines require that you clear the error code.
Not sure if this is the case with yours, you need to do a detailed google.

On my machine its a case of holding two buttons in and twisting the selector to two positions in a specific order.

[IanR7777]

Re: Lavamat 74620-W door problems

Boy this problem is giving me a headache.

Placed a meter across the TRIAC on the control PCB. It looks as if when I close the door (with a program selected) the PCB is momentarily firing the TRIAC. The TRIAC is not shorted open as I suspected.

This means the PCB is commanding a door lock, does anyone have an idea how this could happen without throwing up another error code.

Ran the machine last night it works perfectly except that the door remains closed at the end of a cycle. And auto locks when closed before a start is commanded.

At the moment the machine is fully operational but requires an emergency release to open it 🙁

Pressure switch (three position) and door switches fine, is it possible that the tacho circuit is detecting a low level voltage that makes it think the drum is in slow rotation. Or should this throw a code ?

I noticed a number of previous posts with the same problem on the WEB but no solutions.
Any help or ideas would be welcome

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