Electrolux AEG Vacuum Cleaner: Speed Regulator Failure and Possible 501B-8P Chip Issue

Question

Hello, As my aeg hoover has started to switch off spontaneously, I decided to fix it. I've read that this is a fairly well known problem, and that the motor is disconnecting the sensor under one of the brushes - I pulled the motor out to see if it was working properly, and when connected to the...

machefi · Accepted Answer

And everything is clear - a broken chip .

ElectroTom · Answer

The colleague sensor checked?

machefi · Answer

Have you checked what voltage is deposited on the zener diode D1?

SLen · Answer

On the D1 diode, the voltage in the DC range of the multimeter flows in the range of 2.31 ÷ 2.43 [V].
I have not checked the sensor yet (I am in the process of selecting it - it is on the stator winding), but check it by heating it and checking at what temperature it will disconnect?

ElectroTom · Answer

Say what you plug into that white pin socket. I thought it was this sensor - probably a thermistor.

SLen · Answer

I plug in a potentiometer (speed control) into this white socket and it works. And, as I wrote, under the brushes, it is not there, but there is an element on the stator winding and it is rather him.

SLen · Answer

I am so sorry for that :cry:

. Does anyone know what this system is, can it be changed with something?
PS. Where to find the exact model name of this vacuum cleaner? I am asking because I did not find anything in the papers and there is only the inscription "aeg ergoeasy" on the casing, and when I was looking for the entire module, it was the vacuum cleaners that were distinguished by a series of numbers.

ElectroTom · Answer

Maybe insert the soft start system itself for PLN 12. Maybe a regulator on the system. U2008 with soft start.

SLen · Answer

Hello, after a long break.
I decided to create a soft-start circuit board on the U2008B chip, as proposed by ElectroTom, and exactly I followed the diagram from this pdf .
The results of my work:

PS. I know that the board does not knock you down, but this is my beginnings in PCB design. I connect the ground to the electronics with a jumper (yellow line on the PCB).

Unfortunately, when trying with a 40W bulb, there is no adjustment or soft-start. I connect the bulb to points 2 and 3, the voltage from the mains to 1 and 4. Maybe someone has some experience with this system, or he will notice my mistake somewhere. I will be grateful for your help.

PS2. If necessary, I will upload eagle files.

watek · Answer

================================================== ======== The vacuum cleaner motor is damaged, possibly caused by running at reduced speed for too long and an overfilled dust bag. The protection sensor first switched off after exceeding the current of 8A, and after removing this protection, the motor surely failed (short circuit of part of the winding).

guestpostonsite · Answer

The speed regulator failure on your Electrolux AEG vacuum cleaner could indeed be linked to the 501B-8P chip.
This chip often handles motor control, and failure may cause the motor to run only at full speed or not at all.
Check for visible damage like burnt marks or bulging components on the PCB.
Capacitors near the regulator can also fail and cause erratic motor behavior.
If you have a multimeter, test the chip’s input/output voltages to confirm irregular behavior.
Replacing the 501B-8P chip may solve the issue, but be cautious—it requires proper soldering skills.
Alternatively, replacing the whole speed control board is often easier and safer.
Make sure the replacement part matches your model exactly.
If you're not comfortable with electronics repair, it’s best to consult a technician.
Always unplug the unit before doing any internal inspection or repair.

Electrolux AEG Vacuum Cleaner: Speed Regulator Failure and Possible 501B-8P Chip Issue

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