Bosch SGS5312GB Not Heating

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  • March 20, 2006 at 2:22 pm #16509
    jezza
    Participant

    Above dishwasher finished cycle normally, but dishes were a bit dirty then I noticed plates also slightly wet and cold, so my first thought is the heater has not operated. Is this faulty heater, or possibly circuit board? I am handy with multimeter and soldering iron so can diagnose if I know what to look for. I have pressed the reset buttons, machine pumps for 30sec with 0 on display then stops normally. Has generally been reliable, no other faults over (6+?) years.

    Full model no is SGS5312GB/12

    March 20, 2006 at 3:29 pm #170148
    whitevanman
    Participant

    Re: Bosch SGS5312GB Not Heating

    power off first, check pcb behind facia for dry joint on heater relay

    March 20, 2006 at 5:06 pm #170149
    jezza
    Participant

    Re: Bosch SGS5312GB Not Heating

    Thanks for the pointer, will have a look asap. For info I have tried running a quick wash cycle, three hours later it is still on the final rinse cycle, I guess this is caused by the lack of heating.

    March 20, 2006 at 6:19 pm #170150
    gegsy
    Participant

    Re: Bosch SGS5312GB Not Heating

    Also check heater and under wash conditions, the activation of the heater microswitch.

    Greg

    March 21, 2006 at 4:48 pm #170151
    jezza
    Participant

    Re: Bosch SGS5312GB Not Heating

    I have found and fixed a burnt out joint to a relay on the pcb. Hoping this was the problem. Putting the door back together there are two large plastic jobbies that seemed to sit in the main body of the machine right at the base of the door, can’t for the life of me work out how they are supposed to go in without jamming the door as it opens, any ideas please?

    March 21, 2006 at 6:30 pm #170152
    whitevanman
    Participant

    Re: Bosch SGS5312GB Not Heating

    They are fitted to the hinge, narrow part on the inside , hope this helps, by the way they do add stength to the door.

    wayne

    March 21, 2006 at 6:59 pm #170153
    jezza
    Participant

    Re: Bosch SGS5312GB Not Heating

    Having no luck with the plastic hinge things, don’t suppose there are any diagrams available anywhere? Otherwise will have to hope the door survives without. Will try the machine tomorrow for heating and post the result. I have taken some photos of the burned out joint on the board, would it be useful if I posted it up? If so where?

    Thanks for your help, assuming the repair works this has saved me a lot of hassle!

    March 21, 2006 at 7:50 pm #170154
    gegsy
    Participant

    Re: Bosch SGS5312GB Not Heating

    Ever seen generation game 😆
    These will slot in left and right of door just above door well.Will be obvious when you get one in, no hassle really.

    Greg

    March 21, 2006 at 7:55 pm #170155
    linrew
    Participant

    Re: Bosch SGS5312GB Not Heating

    hi

    if you goto http://www.bshappliancecare.com then click on spare parts and click on the quickfinder application it will let you type in the model number and then look at expolded diagrams of machines. this should allow you to look at how the plastic pieces go back on the hinge.

    i would not recomend soldering the dry joint up to fix the board. i would purchase a new one.

    linrew

    March 21, 2006 at 7:59 pm #170156
    gegsy
    Participant

    Re: Bosch SGS5312GB Not Heating

    linrew wrote:

    i would not recomend soldering the dry joint up to fix the board. i would purchase a new one.

    linrew

    Why not?
    Its just the depletion of solder because of small pad that has made it overheat and cause fault. Cleaning up the joint and re soldering is a more than adequate repair. Done loads in 10 years,why waste a perfectly good board and throw money away.
    Greg

    March 21, 2006 at 8:22 pm #170157
    linrew
    Participant

    Re: Bosch SGS5312GB Not Heating

    hi

    i have heard of them going up in flames when resoldered

    linrew

    March 21, 2006 at 8:26 pm #170158
    gegsy
    Participant

    Re: Bosch SGS5312GB Not Heating

    Hi
    Not heard of that happening and can’t see how either. Even if relay had stuck “on” the thermal protection on heater unit would kick in.
    Was it pcb that caught fire do you know?

    Greg

    March 21, 2006 at 8:28 pm #170159
    Martin
    Participant

    Re: Bosch SGS5312GB Not Heating

    linrew wrote:i have heard of them going up in flames when resoldered

    Not possible my friend, you heard wrong. Resoldering is a realistic worthwhile repair, including a small wire ‘bridge’ link is also a better option 😉

    March 21, 2006 at 8:44 pm #170160
    whitevanman
    Participant

    Re: Bosch SGS5312GB Not Heating

    going of topic gents, this type of repair is adequate for the old whirpools not spinning, pcb behind front pannel,

    oops should i stop giving trade secrets away.

    Wayne

    March 23, 2006 at 12:01 pm #170161
    jezza
    Participant

    Re: Bosch SGS5312GB Not Heating

    Interesting debate. I guess the joint is under-dimensioned for the current flowing which is why this happened in the first place, all the other joints look really good. Anyway I have resoldered and pleased to report the machine works fine now. If the solder joint eventually fails the worst that can happen is a repeat of the problem ie joint burns out and connection is lost so heater stops and in 5 years time I get my soldering iron out again.

    Thanks for your help.

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