[andywash]

Re: Ariston AWD12 – not filling

Hi All,

Eventually, the washing machine stopped working again, as expected. So I replaced the brushes and all is well.
The brushes that came out were definitely worn to next to nothing.

If your machine just doesn’t fill when you start a programme, then check the brushes. You won’t getting an error code when it happens, it will just sit there and do nothing.

Thanks for everyones advice

Andy

[andywash]

Re: Ariston AWD12 – not filling

Simon46:
Thanks for the info, thats reassuring to know it won’t start when the brushes go completely open. I will order some and then try disconnecting them to see if it produces the same fault, no point in dragging out the old lump more than once. I shouldn’t say that really its being working for 8 yrs now and used every single day.

roly16:
I can sympathise, but for me if its anything involved with electronics then the whole family and friends will always ask me to fix it and I don’t get paid for it. At least its not my day job. 😕

Next job Mums dish washer, built-in and its sprung a leak. Looks to be between the motor/empellor of the pump. 🙁 Time for some searching the forums

Anyway, thanks again everyone, will let you know the final outcome.
Cheers
Andy

[andywash]

Re: Ariston AWD12 – not filling

Easy to find out. Pull a wire off one of the brushes and see if it still fills. If it doesn’t, put the wire back on and see what happens. Your questions are then answered.

Now why didn’t I think of that. :rolls:

I will give it a go and let you know……oh hum, pull the machine out again, disconnect hoses/drain…fun fun fun!!

Anyway, thanks for the help.
Andy

[andywash]

Re: Ariston AWD12 – not filling

Simon46:
The brushes are low and will do with replacing, but is this the cause of the non-filling problem. Unfortunately, I didn’t get to meter them before removing them, but now they are replaced it meters ok.

So, I placed it on a spin cycle and the motor turned as expected. Then I placed it on a wash cycle, and yes the valves were energised, so problem fixed!!!

Or, in the process of doing all this investigation have I fixed it by moving things ie loose connection or something or is it purely down to the brushes.

Essentially, I need to know if worn brushes will stop it from filling? Is this a known problem?
Also, for me why doesn’t it fill because the brushes are worn. Is it because there is no point in filling if the motor can’t turn?
That leads me on to another question, why does it just sit there and not show a fault. Its not as if the motor will fix its own brushes 😀
Thanks
Andy

[andywash]

Re: Ariston AWD12 – not filling

Penguin45 :
My initial thought was the triacs, which when I measured the voltages driving them I noticed that the triacs were not turning on. So I replaced them, but no change still not working. However, this was a mistake on my part in that the driving voltages were in the opposite sense, so the microprocessor wasn’t even turning them on. This lead me to look else where as to why the processor wasn’t turning them on ie its waiting for some other input condition.

Roly16:
The pump is fully operational, as when I cause the pressure switch to go to its flood level, the pump operates. Although, this operates from the pressure switch directly, I have also managed to operate it from the relay on the pcb, by forcing the driving logic to turn on the relay. Don’t worry I have been an electronic engineer for 20 yrs, so I know what I am doing.

Simon46:
You mention the motor bushes, but is it a requirement for it to fill with water. I can see that there is no reason for filling if the motor doesn’t have any continuity (ie bushes worn and not making contact with the commutator), but is this actually a condition that is checked by the programmer.

The pcb has been checked as far as I can, all diodes, transistors, triacs, relays all operate. So is it the motor brushes???
Also, the pcb over drives the relays, may be why there are some dead ones out there. The psu on the pcb is unregulated, basic design and cheap in my opinion.

So, is it the brushes???

Andy

[andywash]

Re: Ariston AWD12 – not filling

Ok, managed to find the spec on the pressure switch and the contact arrangements. Its a simple changeover contact between low and high pressure. With an additional contact for overflow, which works at a slightly higher pressure. So the pressure switch is fine.

I have metered the valves, but I have traced the issue back to the programmer which is not even trying to energise the valve. Actually, I have traced it right back to the processor in the programmer.

So my question really is, what does the programmer need as inputs before it will energise the inlet water valve. I have checked the following and are ok:
1) Lo/Hi Pressure switch to programmer.
Now the programmer senses other items, but are any of these necessary before energising the valves
2) Motor Pin??
3) Drain Pump
4) Temp sensor dryer
5) Temp sensor drum
6) Motor tacho

Andy

[andywash]

I have a feeling that the pressure switch is one level + overflow protection.
Does anyone know if the level contacts are normally closed or normally open, when there is no pressure

Thanks
Andy

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