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

SLen 31722 11
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Why does my Electrolux AEG vacuum cleaner switch off spontaneously and have no output from the speed regulator, and is the 501B-8P chip likely faulty?

The most likely cause is motor damage rather than just the speed regulator: the motor may have been run too long at reduced speed with an overfilled dust bag, the overcurrent protection sensor tripped at about 8 A, and after bypassing that protection the motor likely developed a short in part of the winding [#14225101] A separate diagnosis also points to the regulator chip, because a measured D1 zener voltage of about 2.31–2.43 V was interpreted as indicating a broken chip [#12191809] Earlier checks suggested the sensor should be verified too, since it was suspected to be the thermal sensor on the stator winding [#12186950][#12191244] If the motor is indeed shorted, replacing the 501B-8P alone will not solve the problem [#14225101]
AI summary based on the discussion. May contain errors.
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  • #1 12186605
    SLen
    Level 10  
    Posts: 38
    Help: 1
    Rate: 11
    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 speed controller the motor wouldn't start at all.
    - all diodes and resistors checked - OK,
    - triac checked using the method in the attached diagram - OK,
    - capacitors are not short-circuited (I did not check capacitance),
    - no voltage at regulator output (blue wires),
    - the highest power resistors (those 10k Ohm) heat up a lot,
    I'm anxious to fix the regulator, because when I connected the motor to check it directly to the mains, the plug burned 16A (the 2kW motor according to my calculations normally draws 8.7A and on start-up I don't know how much, but probably more + other connected devices - the effect as I wrote...).
    In this case, the 501B-8P chip is blamed. If anyone knows what this chip is, what its replacement is, or has any other suggestions and comments on the diagnostic work I have done :wink: then I would welcome any information and suggestions.
    Regards

    Electrolux AEG Vacuum Cleaner: Speed Regulator Failure and Possible 501B-8P Chip Issue Electrolux AEG Vacuum Cleaner: Speed Regulator Failure and Possible 501B-8P Chip Issue Electrolux AEG Vacuum Cleaner: Speed Regulator Failure and Possible 501B-8P Chip Issue .
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  • #2 12186950
    ElectroTom
    Level 25  
    Posts: 755
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    The colleague sensor checked?
  • #3 12188119
    machefi
    Home appliances specialist  
    Posts: 6439
    Help: 763
    Rate: 1487
    Have you checked what voltage is deposited on the zener diode D1?
  • #4 12191087
    SLen
    Level 10  
    Posts: 38
    Help: 1
    Rate: 11
    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?
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  • #5 12191244
    ElectroTom
    Level 25  
    Posts: 755
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    Say what you plug into that white pin socket. I thought it was this sensor - probably a thermistor.
  • #6 12191301
    SLen
    Level 10  
    Posts: 38
    Help: 1
    Rate: 11
    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.
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  • Helpful post
    #7 12191809
    machefi
    Home appliances specialist  
    Posts: 6439
    Help: 763
    Rate: 1487
    SLen wrote:
    On the D1 diode, the voltage in the DC range of the multimeter flows in the range of 2.31 ÷ 2.43 [V].

    And everything is clear - a broken chip :cry: .
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  • #8 12191869
    SLen
    Level 10  
    Posts: 38
    Help: 1
    Rate: 11
    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.
  • #9 12198082
    ElectroTom
    Level 25  
    Posts: 755
    Help: 43
    Rate: 203
    Maybe insert the soft start system itself for PLN 12. Maybe a regulator on the system. U2008 with soft start.
  • #10 12548650
    SLen
    Level 10  
    Posts: 38
    Help: 1
    Rate: 11
    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:
    Electrolux AEG Vacuum Cleaner: Speed Regulator Failure and Possible 501B-8P Chip Issue Electrolux AEG Vacuum Cleaner: Speed Regulator Failure and Possible 501B-8P Chip Issue
    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.
  • #11 14225101
    watek
    Level 10  
    Posts: 7
    Rate: 7
    SLen wrote:
    Hello,
    As the aeg vacuum cleaner started to turn off by itself, I decided to fix it. I read that this is a fairly known problem, and the motor disconnects the sensor under one of the brushes - I pulled out the motor to see if it is working properly and after connecting to the speed controller, the motor does not start at all.
    - all diodes and resistors checked - OK,
    - I checked the triac using the method from the attached diagram - OK,
    - the capacitors are not short-circuited (I have not checked the capacitance),
    - no voltage at the regulator output (blue wires),
    - the most powerful resistors heat up (these 10k Ohm),
    I care about the repair of the regulator, because when I connected the engine to check directly to the network, the plug burned out 16A (the 2kW engine according to my calculations normally takes 8.7A and for start-up I do not know how much, but probably more + other connected devices - the effect as I wrote ...).
    In this case, the 501B-8P chip is blamed. If anyone knows what this system is, what is its replacement, or has any other suggestions and comments for the diagnostic activities I have performed :wink: I will gladly accept any information and suggestions.
    best regards

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

    ================================================== ========
    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).

  • 501B-8P chip and capacitor fault diagnosis

    #12 21604031
    guestpostonsite
    Level 1  
    Posts: 1
    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.
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Topic summary

LABEL_AI_GENERATED
An Electrolux AEG vacuum cleaner developed spontaneous shutdowns and a non-functioning speed regulator. Initial checks found the triac, diodes, resistors, and capacitors apparently normal, but no output voltage from the regulator and overheating 10 kΩ resistors. The discussion focused on a possible failure of the 501B-8P control chip and the motor protection sensor/thermistor on the stator winding. A soft-start replacement based on the U2008B chip was proposed and later built, but it did not provide regulation when tested with a lamp. The topic later concluded that the vacuum cleaner motor itself was damaged, likely from prolonged low-speed operation and an overloaded dust bag, leading to winding short-circuit after the current protection had tripped.
AI summary based on the discussion. May contain errors.
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