Bosch SGS43A18GB/27 died

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  • November 10, 2008 at 4:22 pm #40915
    starfire
    Participant

    Hello,

    For the last 2 weeks the dishwasher had been making a single click noise approx. every 5-10 secs repeatedly while left on the delay timer (ready to run on economy 7), but apart from this was working fine.

    Today I found the dishwasher with no lights on, normally it displays 0 to indicate the end of the cycle. It does appear to have washed the pots, but there was a little brownish water left in the bottom of the machine.

    The problem now is on pressing the main power button in no lights are coming on and it appears dead.

    Before I start to investigate tonight has anyone any pointers as to what the issue may be, I’m presuming (perhaps wrongly) its linked to the clicking noise that started?

    Thanks for any help!

    November 10, 2008 at 8:58 pm #268008
    starfire
    Participant

    Re: Bosch SGS43A18GB/27 died

    OK, an update.

    Took the machine into the garage and it powered on – the fuse for the socket in the kitchen had blown…

    Held down the two reset buttons and it pumped out the remaining water.

    It was then stuck on displaying zero on the LED display and the rinse and salt LEDs are lit (as is usual as we use tablets), could not get it to start a fresh cycle or react to any button presses. Left power disconnected etc. but still same issue.

    So, decided to dismantle and removed the control module and it appears to have blown, there is a complete track gone on it and black scoring on the plastic.

    http://s497.photobucket.com/albums/rr339/e10kstarfire/

    It looks like this is a £72 part – my question is, could something else have caused this to blow and if I replace it with a new one is that likely just to blow as well, or is it more likely just a control module issue and replacing it will most likely resolve the problem? (also bear in mind the click sound I had).

    Any experience/advice on this? Its about 5-6 years old I think.

    Thanks!

    November 10, 2008 at 9:47 pm #268009
    Penguin45
    Participant

    Re: Bosch SGS43A18GB/27 died

    I think I’d be following the edge connector back and find out what is on the other end……. Constant clicking can be the alternator valve being continuously driven due to component failure on the board.

    Penguin45.

    November 10, 2008 at 10:04 pm #268010
    starfire
    Participant

    Re: Bosch SGS43A18GB/27 died

    OK, you have lost me there, cannot find alternator valve on the bosch website. Would you expect this to being driven while the dishwasher is on its delay timer?

    In your experience can control modules blow on their own or is it more likely something else caused it to blow? If something else then I’ll probably just buy another dishwasher…

    November 10, 2008 at 10:10 pm #268011
    Penguin45
    Participant

    Re: Bosch SGS43A18GB/27 died

    Your machine has a motorised valve to switch the water flow between the top and bottom rotors. It is an integral part of the heater assembly. A common problem seems to be for the switching triac to fail on the pcb, allowing power constantly down to the valve motor. This can ultimately cook and blow the pcb.

    Penguin45.

    November 10, 2008 at 11:10 pm #268012
    starfire
    Participant

    Re: Bosch SGS43A18GB/27 died

    Thanks,

    Well, it looks like the blown track may feed back via 4 yellow cables which go to the rinse aid and detergent door release mechanisms.

    For the detergent door release there is a plunger that when activated would move outwards and press against a spring loaded release mechanism. I removed this plunger mechanism and I notice its very hard to get the plunger to extend outwards, is this normal?

    If anyone could advise on this question I have asked I would really appreciate it:-

    can control modules blow on their own or is it more likely something else caused it to blow? If something else then I’ll probably just buy another dishwasher…

    November 11, 2008 at 6:42 pm #268013
    nomadPaul
    Participant

    To answer your question…Yes , modules will sometimes blow tracks with no other component involved. The normal reason is moisture ingress into the board area .

    There is a possibility that the dispenser may have blown the board as although i’ve not seen it personally , i have heard of it from other engineers.

    If you decided to go ahead with repairing this dishwasher then it would make sense to change the module and dispenser at the same time .

    Oh , and the reason the ‘plunger is hard to extend is that i believe its attached to a wax plug that expands when powered up which is what pushes the plunger out to activate the detergent door

    November 11, 2008 at 6:52 pm #268014
    Simon46
    Participant

    Re: Bosch SGS43A18GB/27 died

    Yes have had this dispensor solenoid blow up a module before.
    Power off if going in

    Regards
    Simon

    November 11, 2008 at 8:02 pm #268015
    starfire
    Participant

    Re: Bosch SGS43A18GB/27 died

    Hi Chaps,

    Thanks for your replies, are the rinse aid sensor (reed switch) and detergent draw actuator (wax plug) something I can test for failure with my test meter? The yellow cables go to both of these but I guess its only likely the actuator may have caused the failure as it draws significant power to activate?

    Cheers.

    November 18, 2008 at 3:46 pm #268016
    starfire
    Participant

    Re: Bosch SGS43A18GB/27 died

    Ok, I have fitted a new control module and the machine has sprung back into life but its stuck trying to continuously pump out – if I pour water in it does pump it out fine.

    I have tried the front panel reset sequence but this makes no difference apart from setting the program time to 0 which it should do.

    So is there any magical reset sequence I need or anything obvious I can check, I’m presuming the control module burn out may have broken a sensor somewhere?

    Any help appreciated

    November 18, 2008 at 5:29 pm #268017
    nomadPaul
    Participant

    Sounds like you may have a flooded base pan.

    Power off and unplug . Tip appliance carefully backwards/forwards and see if lots of water spills out. Once drained , power up and see how the machine runs then . If it starts ok but goes into a continual pump out after a while , you will probably have a leak into the base which will need investigation.

    November 18, 2008 at 5:41 pm #268018
    starfire
    Participant

    Re: Bosch SGS43A18GB/27 died

    I’ve checked the base pan and it appears dry.

    I tipped it back but nothing came out. The microswitch linked to the mushroom flood sensor appear to work ok testing with my test meter.

    Also no water is being allowed into the machine, I have the left hand side off and can see there is no movement of water coming in.

    November 18, 2008 at 7:15 pm #268019
    starfire
    Participant

    Re: Bosch SGS43A18GB/27 died

    I note the salt reservoir is full of water…. never used it, only used tablets.

    The matrix on the left hand side of the machine is very dirty at the top, is the matrix easy to remove to clean? It looks as though the fill blue hose would be easy to remove but the other two hoses at the bottom of it are held on with black rubber connectors, how is it best to remove them?

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