Clothes dryer repair: AKO 742336 control unit type EDR0692XAX

Repairs of household appliances aren’t generally my field of expertise, but in some cases, it can be a very rewarding activity. Some particular models of clothes dryers (“AEG”, “Whirlpool”) common in Europe use a control board, and this is not designed up to standard. The design flaw, it renders the machine inoperative in the very sense, you can’t switch it on, and it doesn’t show anything on the display. Typically, this occurs after roughly 3 years of service….

This is the control unit:
dryer control

dryer control board

dryer control board detail

edr0692xax board

After a quick inspection, it is fully clear that the defect rests with the control board, model EDR0692XAX. Easy fix, just get a spare! Well, easy, but outrageously expensive.

ako 742336 edr0692xax

The defect, it is related to a DC switch mode regulator converting mains voltage down to some useful voltage to run the controller. This is a step-down converter, NOT mains insulated!

lmk304 application

Two dead parts were found, the LNK304 switch mode converter circuit, and a 47 Ohms resistor.

dryer control lnk304gn 47r resistor

The LNK304GN is easily found, and replaced. The resistor: WATCH OUT! This is a fusible resistor, NEVER replace with just a common resistor – it will potentially set your house on fire, when the next switch mode failure happens.
The 47 Ohm resistor, it’s a 3 Watt resistor, and the ULW3 series, available from all major suppliers, should be a good replacement.

ulw3 fusible resistor

This is the failure charcteristics of the ULW3 resistors – it will go open circuit if overloaded, without release of any flames or particles. It a hybrid, partly fuse, partly resistor.

ulw3 fusing characteristics

15 thoughts on “Clothes dryer repair: AKO 742336 control unit type EDR0692XAX”

  1. Hi,
    I have the same problem with my dryer.
    I have two questions:
    1. how can you tell it’s a 47 ohm resistor?
    2. do you know if there is a datasheet for this board?

    thanks for the help,

    1. I have the same problem and it is written on the resistor 47R 3w where 3W means 3 whatd and R47 means 47 ohm I hope this helps .
      It’s Sunday do I will try to find the parts in local shops tomorrow.

  2. Hi,
    Very useful article! Most likely also seems to be the issue with my Dryer. Where online can I buy these two parts in Europe? Where on the circuit board do I find the LNK304 switch (on the topside or down side of the PCB; if you can indicate the two parts in your picture?)

    Thank you for the help!

    1. Hi, You can find these on ebay or other supplieres no problem. They are widely available. The resistors need to be flame proof. Normal resistor will be a fire hazard!! The part is easy to find on the board otherwise just send a picture of the board.

      1. Hi Simon,
        Thanks a lot for the reply.
        My circuit board looks exactly like yours (EDR0692XAX). So if you can point the IC on your control board picture, then that should suffice.
        Otherwise, I couldn’t find any IC on the front side of the board with 7 pins. LNK304GN in your schematic shows 7 pins, the 6th one is missing.
        Thank you again for helping out.

        1. Hi, the IC actually on the other side, so you can’t see it on the picture. But it is easy to find. You have to take out the board from the holder by pushing back the white plastic tabs on the holder/case. This may differ slightly from dryer to dryer. Simon

  3. Hi – hoping you can help me ! My Mum’s Bosch dishwasher failed, no power to panel etc. I suspect a LNK304 failure and can see the subsequent AC input resistor failure. The resistor obviously heated up and has discoloured the bands so I can’t see what value it was. I am suspecting either 22 Ohm or 47 Ohm. We are on 240VAC over here if that makes any difference.

    Any help appreciated !

    1. Hi, I assume it is a 27 Ohm resistor. Make sure to use a fameproof resistor, 2 or 3 Watts. You might also want to check the big capacitor close to the LNK304. Simon

  4. Hi
    Please i have the same problem with a fagor washing machine. The LNK304GN and the resistor.
    I want to ask if there is any equivalent for this part

  5. Hi, Many Thanks. Ich have a Zanker KTH 72701 PE with the same board inside. Ich repaird it as desceibed ans it work perfect again. Ich save 500€.

  6. hi simon!
    very helpful your advice
    many thanks!
    I have the same problem
    just want to ask which is the LNK 304 from the 4 same swithes on the pcb.
    And how can i check if is damaged via a multimeter?
    Also which is the big capacitor close to the LNK304?
    many thanks again

    1. Hi George, First, I would check if it has any visible damage, and if it has a short between S and D pins of the LNK304. In any case, it may be faster just to replace with new parts. The capacitor, unfortunately, I don’t know the value. Did your capacitor burn or got lost? Don’t think it is too critical, a similar value than existing may be good enough.

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