[shuckc]

Re: Help diagnosing e20 on AEG Favorit 55002 VI

I bought the new sensor (substitute model is now blue) and it made no difference, still have a problem every other week or so maybe 10{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of runs.

I found some wiring manuals on a spare parts forum, so next I tapped the wiring harness at the control board and hooked up a logic probe to the +5V, 0V and signal pins from the sensor. What I found is that usually the signal is a nice 50{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} duty waveform with frequency depending on fill level when dishwasher is working, and on some runs sense drops to 0V even through the sensor is still powered, which is when it gets stuck pumping out.

I think it must be an intermittent break in the wires from control board to the sensor, probably where it goes through the door parts and is flexed. When I next get some time I’m going to pull out the wiring harness for port-E on the controller to the sensor and check it over…

[shuckc]

Re: Help diagnosing e20 on AEG Favorit 55002 VI

I took a look at the LHS, the manifold/matrix all looks pretty clean, even in the area subject to washback from the inside. I tried a rinse, and it got straight through. Now on a wash, seems to be working again. Very annoying 🙁

Based on disassembling the sensor and reinstalling it has helped twice now (and there doesn’t seem to be any metering/impeller jug on the inlet any-more) I will order up a replacement. Can anyone help with the part number needed to order it?

[shuckc]

Re: Help diagnosing e20 on AEG Favorit 55002 VI

I have just seen on a few other posts that there is all manner of gadgetry behind the LHS panel, so I’ll take a quick look under there and see if anything obvious (impeller jug, blocked matrix, manifold etc).

[shuckc]

Re: Help diagnosing e20 on AEG Favorit 55002 VI

Hi Martin,
I wondered if you are still around? I was never able to reproduce the fault code whilst I had the machine pulled out last year. It’s taken a full 12 months to go from intermittent (1 cycle in ~20 failing) to failing every cycle.

I’ve stripped the machine side and front and taken another look at it. From the identity tag the PNC is 911436014/02 for Model F55002VI0P.

I chased the 3-wire loom from the fill pressure sensor back to the control board. I probed the sense wire against 0v and got readings of 35hz when full and around 51~53Hz when drained. Seems high when drained, so I wondered if you can check values for this pnc?

I did a visual inspection of the control board, nothing obvious. I then disabled the pressure sensor, all looks fine internally. The spring is free to move the ferrite core into/out of the inductor coil as the diaphragm moves (interesting design).

After reassembling it was the same, I couldn’t get the control board to accept the machine has emptied, despite the sump dry. I did an experiment by disconnecting the sense pipe to the sensor, so it was just reading atmospheric. This allowed the program to continue and start filling. It then got near to overflowing as no feedback so I turned it off.

Anyway, I’m short on ideas. I’m guessing sensor replacement, although it seems to be able to register atmospheric OK. It did occur to me it could be a problem with the sump moulding or sense tube or similar.

Is there a way to get actual diagnostics/readings out of the control board?

Anyway the wife threatens to throw either the dishwasher or me out next week, so I’d better come up with a plan.

[shuckc]

Re: Help diagnosing e20 on AEG Favorit 55002 VI

Thanks martin, I’ve got a frequency counter on the meter so I’ll give this a go and see if its in spec.

[shuckc]

Re: Smeg type 12140 DWI 45

Thanks, I put the capacitor in and the washer pump is back up and running, great sound to hear 🙂 The rinse program now runs to completion. Unfortunately all is not well, and the main programs now stop with an E3 fault, ‘cannot heat’ 🙁 indicated by ooxxo on the LEDs (o on, x off). Looks like more troubleshooting!

What can be tested? I’ll check the element resistance, if that is good I’ll try and eyeball the PCB to see if the drivers look OK.

[shuckc]

Re: Smeg type 12140 DWI 45

I read about this motor type, looks like 50, 50 and 100 ohms is about right for permanent-split capacitor motor:
http://www.allaboutcircuits.com/vol_2/c … #02485.png

I can’t find the part on here (ukwg) but espairs seems to have it here:
http://www.espares.co.uk/part/dishwashe … citor.html

Looks improved as now a metal case – £21 + £3.95 pnp :-/
Will give it a go!

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