Diagnostics programme on AEG LAVW1250

[leavemetogetonwithit]

914002429/00
Megger reads 150M + on whole machine. I do not think this is a low insulation problem.
This machine has been stopping during wash intermittently for some months apparently. I’ve been to it a couple of times and last error was E52. I checked that there was a good feed from tacho to board and then took the motor off and checked every aspect of it and its wiring loom. All good. (History: It had got wet a year or so ago when the soap hose got loose and I had cleaned and dried it then.)
On running the diagnostics programme (something I’m not that familiar with) everything works OK but I wasn’t sure what I was supposed to do during the fill stages where the various valves are tested.
So at second position for example I allowed the machine to continue filling thinking it would stop itself at some point. But it doesn’t it just keeps on filling. I allowed it to get three quarters of the way up the glass, expecting the pump to kick in but that didn’t happen. Same thing happens on all the other valve test positions during diagnostics. What I don’t understand is in the column “Operating conditions” it states, “Door locked Water level below anti-flooding level Maximum time 5 mins.” What does that mean?
I am pretty certain there is no fault in the pressure system or p/sw. nor its loom as all that seems to work fine during a normal programme and I have tested it and the connections on it.
May have another E52 intermittent to go and look at when I’ve finished negotiations with a rather “mess-you-about” customer so would be handy to know the correct way to run diagnostics.
Mike.

[captaincaveman1]

Re: Diagnostics programme on AEG LAVW1250

The three fill stages at the begining will just keep filing up if you let it as the reason for those tests are to check the flow of water into each part of the dispenser thats all . I would clear the fault code and run it and if E52 reappears and presuming the brushes and tacho are ok its proberley the motor losing its insulation when it warms up given the megger reading (assuming its 150 ohms or is that the max your meter reads upto? ) Did you disconnect the motor and megger it then ?

[leavemetogetonwithit]

Re: Diagnostics programme on AEG LAVW1250

Good point. You could well be right. I only meggered whole machine at cold and 150M was from memory, might have been 350 (must remember to record these things). Had been thinking along lines of motor internal toc. Will wait and see if it reoccurs as pulled, checked and squeezed up all connectors in the hope.
Thanks for clearing up my confusion about test programme too.
Mike.

[leavemetogetonwithit]

Re: Diagnostics programme on AEG LAVW1250

Well, I went back and meggered the machine with motor well warmed up (helped a bit with my paint stripper gun 🙂 ) and it had gone down to 28M which seemed to be the point at which it packed in. Decided that replacement motor would have a good chance of sorting it and lined a good one up on Ebay for £40 delivered then rang customer.
She was one of those sort of people who doesn’t trust anything secondhand and has decided that £400 on a new Bosch is better than £200 or so for a new motor. I didn’t waste my breath trying to persuade her otherwise as I knew that if something else subsequently went wrong with the machine I might be held to have given poor advice.
I’ll get my labour paid anyway so it’s no big deal for me. Just would have liked to have been able to say that I had cracked an E52. Never mind, tomorrow is another day.
Mike.

[repman]

Re: Diagnostics programme on AEG LAVW1250

hiya just for info I have had 3 or 4 intermitant E52’s which turned out to be cracked solder joints on the motor relays in the module.when it is on the coil joints there are no signs of burning so use a mag glass to find them.
jim

[leavemetogetonwithit]

Re: Diagnostics programme on AEG LAVW1250

😕 Replaced both relays yesterday and can’t now remember for sure if it faulted again after that! Wasn’t able to get close look at joints because had forgotten magnifying glass. :rolls: Now you’ve set my mind a wonderin’.
Will ring them tomorrow and get them to hold off for a day or two on the Bosch till tenants have given machine another thrashing test.
Mike.

[leavemetogetonwithit]

Re: Diagnostics programme on AEG LAVW1250

Doh! Silly last post. Had replacing the relays sorted it I would hardly have come away thinking I needed a motor.
So customer says I can take any bits off I want. (Unstated perhaps, “You might charge me a little less?” 😆 ) I declined but am now thinking it might be worth having pcb as they can be re-configured for different models from front panel, can’t they? Or is that just something I dreamt?
Repman Jim, how many intermittent E52s do you see in the course of a year? I had stupidly assumed they had all been relay joints but perhaps that’s only a proportion of the ones you’ve seen?
Mike.

[repman]

Re: Diagnostics programme on AEG LAVW1250

Not to many intermittent E52’s fortunately maybe only half a dozen or so a year
but as the fault says no output from tacho you are left with either the motor
turning with the high speed burst and genuinely not giving any tacho output (magnet broken,open circuit coil etc.)or failing to run, this of course can be due to module relays/track or wiring.
The harness plug itself,motor socket or the worst and hardest to prove is the motor t.o.c.opening
I don’t think I would be going down the insulation failure route as in my experience this gives rise to E51 motor triac sort circuit
so it sounds like a duff motor in that machine after all
and I don’t think you can reprogram that board
jim

[leavemetogetonwithit]

Re: Diagnostics programme on AEG LAVW1250

Thanks Jim and cap’n, your help on this one has been very enlightening. I feel a little better equipped now to tackle the next errant Lux product that has the audacity to try and waste my time 😀 .
Mike.

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