Problem with Bosch SGS5312.

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  • November 25, 2007 at 5:32 pm #32494
    vfrpete
    Participant

    Hi folks. First time of posting on this particular site but hopefully it will bear fruit.

    The other day I noticed that the mains power had tripped out at the consumer unit. I reset it and all seemed to be well. My wife then noticed that the dishwasher had stopped, obviously in mid-cycle. It was then clear that it was this that had tripped the breaker.

    I checked the appliance fuse, and as expected, all was well.

    However the control panel display will not light. I have now stripped all the panels off and have the door apart. (I fitted a new soap dispenser three or four months ago by the way). I’ve checked the cycle start switch and confirmed that there is power on the blue and brown wires, and that there is output from the switch.

    I’ve checked that the main motor is free to rotate and I’ve looked for any obvious signs of flooding that could have shorted anything. I thought that this might be likely as it had tripped the consumer unit breaker, but apparently not.

    In the process I am slowly but surely dissolving the crud out of the regenerator tubes in the hope that I’m not wasting my time.

    If anyone has any ideas on my next move I would be very grateful.

    I guess I should also mention that the machine appeared to working fine up until this problem.

    Thanks in advance
    Pete.

    November 25, 2007 at 6:56 pm #235343
    Penguin45
    Participant

    Re: Problem with Bosch SGS5312.

    I think I’d be looking at the heater and the mains suppression unit. Both can break down with a pop and unfortunately may take the computer board with them.

    Continuity testing best way of tracking the path, BTW – live testing is exceedingly dangerous.

    Penguin45,
    Moderator.

    November 25, 2007 at 7:09 pm #235344
    vfrpete
    Participant

    Re: Problem with Bosch SGS5312.

    Many thanks for that Penguin45, and I do take your point re live testing.

    I’ve checked the heater and it’s reading 22/23 Ohms, which I believe from another thread is OK.

    How do I check the mains suppression unit please.

    By the way I’ve removed the computer board since my original post and it’s well and truly fried.

    Cheers
    Pete.

    November 25, 2007 at 7:30 pm #235345
    Penguin45
    Participant

    Re: Problem with Bosch SGS5312.

    Suppressor is in the bottom rear right corner, where the mains cable comes in. Remove mounting plate from rear.

    Heater reading is acceptable, but check for earth reading.

    Penguin45.

    November 25, 2007 at 8:50 pm #235346
    vfrpete
    Participant

    Re: Problem with Bosch SGS5312.

    Penguin45,

    I’ve checked the heater and there is no short to earth.

    I’ve removed the mains suppression capacitor and it “looks” perfectly OK, as in doesn’t look as though it has cooked or anything.

    Is there any way that I can test it that you know of? I only have a digital multimeter to hand.

    Cheers
    Pete.

    November 25, 2007 at 9:56 pm #235347
    nomadPaul
    Participant

    It sounds like moisture has got into the main board and shorted out some of the tracks or relays . It may be just the board thats gone without any other component being affected.

    Is there a large section blown on the board or is it a single component

    November 25, 2007 at 11:15 pm #235348
    vfrpete
    Participant

    Re: Problem with Bosch SGS5312.

    It’s a large section. Well two actually. (Can’t seem to figure how to upload pictures to this site so will have to describe.)

    With the pcb connectors uppermost and looking at the circuit tracks, it is a whole section maybe 50mm square top left hand.

    Also another small section pretty much in the middle of the board.

    Interestingly there is also what looks like tracking burn between the two straps running along side the ribbon cable connector on the other side of the board. One of the straps looks as though it has been pretty hot in a small area along it’s length.

    I have no problem in replacing the module ( to be purchased from this site of course), but if that then blows straight away it starts getting silly expensive. After all a module is about 30{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of the cost of a new machine.

    Mmm problem.

    Thanks for the help
    Pete.

    November 25, 2007 at 11:18 pm #235349
    Simon46
    Participant

    Re: Problem with Bosch SGS5312.

    Detergent dispenser solenoid going short circuit will make a mess of the board. Might be worth a look with the meter.

    Regards
    Simon

    November 26, 2007 at 12:22 am #235350
    vfrpete
    Participant

    Re: Problem with Bosch SGS5312.

    Thanks for the suggestion Simon.

    Unless I’m reading the meter scale wrongly it looks as though I’m seeing just under 2K Ohms across the dispenser solenoid.

    Does that sound about right?

    Regards
    Pete.

    November 26, 2007 at 12:24 am #235351
    clivejameson
    Participant

    Re: Problem with Bosch SGS5312.

    vfrpete wrote:I’m seeing just under 2K Ohms across the dispenser solenoid.
    Does that sound about right?

    Yep :tup:

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