Bosch S9J1B keeps pumping endlessly

[maxmax350]

Hello all,

First off please forgive my limited English, I’m writing you from the Netherlands because the Dutch forums are not helping me.

My Bosch S9J1B dishwasher keeps pumping water in and out endlessly as soon as I switch it on, even with the door open.
I’ve done some troubleshooting but cannot seem to find the cause.

What I’ve tried so far:
– Disconnected the plastic labyrint on the left side, seems clean.
– Checked the overflow switches, they seem to work and aren’t stuck.
– No water in bottom of dishwasher, no leaks.
– Water is coming out of the drain hose.

I’ve made a one minute video to show the behaviour. I’m hoping that someone can see what is wrong with it or point me in the right direction.

VIDEO HERE: Video link

Thanks in advance for your help!

Kind Regards,

Max

https://imgur.com/9CPV4XL
https://imgur.com/jDY6QKN
https://imgur.com/3AxhaQF

[electrofix]

this looks like a timer problem

what is the full Enr and FD numbers ?

Dave

[maxmax350]

Hi Dave,

the numbers are as follows:
E-nr: SGV33E13EU/50
FD: 8408 000247

Regards, Max

[electrofix]

thought this one might have been part of a recall bosch did around this time. searched here but cant bee 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} as the list i have may not include Netherland models so you need to do some digging to find out

models affected where in the date range 7901 to 8504 and yours falls in that range but does not mean its covered. your was made august 2004
the fault was the heater relay on the board where the solder would blow and potential fire problem. to cure it Bosch added an external relay to take the power off the board but would replace the timer if necessary

anyway in your case i would open the pcb timer and look for damage. you will have to be careful as the plastic on some of these gets brittle with age and i have found it can snap lugs easily

Dave

[maxmax350]

Thanks for the help so far!
I opened up the PCB. Unfortunately I don’t see any damage / burn marks or anything like that. Here are some pictures.

https://imgur.com/JOhXDh0
https://imgur.com/lzjGNJq

Regards, Max

[electrofix]

am i imagining it or has this chip got a hole in it ?

Dave

[maxmax350]

Actually, after taking a closer look I noticed this:
https://imgur.com/adp2nPA
Some plastic broken off on one of the components. Maybe because of internal failure of this component?
Do you think this could be causing the problem?

EDIT: Yes indeed! Just seeing your message above now

[electrofix]

yes thats a triac.

you could try replacing it as its probably the one that feeds the pump

why its popped is a bit of a worry but they are cheap, If you can solder

Dave

[maxmax350]

Soldering is no problem. I’ve ordered the part, it should arrive in a week, apparently it needs to come from Germany. I’ll update on the outcome here.

Regards, Max

[maxmax350]

Hi Dave,

I’ve replaced the triac and put everything back together. Unfortunately the same problem is still there.
As soon as I switch on the dishwasher it starts pumping again.
The buttons don’t light up and do not respond. (same as before) picture

Any other ideas on what could be causing this? I’d like to keep this machine in use instead of binning it if I can..

Regards, Max

[electrofix]

when triacs go bang its not unusual for other components to blow as well. take a carefull look at the other resistors feeding it. gate seems to be fed by a transistor. since there are other identical triacs on the board driven the same way you can compare measurements between them to see if transistor is faulty

Dave

[maxmax350]

Hi Dave,

I’ve taken it apart again and took another close look but don’t see anything visibly damaged on the board.
I’ve emailed around to find a second hand replacement PCB but can’t find any.
Currently seriously considering getting a replacement machine..

[electrofix]

can understand that. your into deeper electronics from here and if the main chip has failed its a scrap board anyway

was a good try but we failed. You win some, you lose some

Dave

[eoristi]

Hi MaxMax,

I have a similar problem, have you been able to fix it in the end?

Thanks

[andyjawa]

YOU COULD DO THE FOLLOWING. Turn the power off remove the left hand side cover and you should see a near 6″ vertical red or black plastic rod towards the front of the appliance rod at the bottom.This is the emergency flood rod which is at its bottom via a grey arm on top of a piece of polystrenne acting as a float, If the machine floods its base, though you said it hasn`t, the float floats upwards moves the rod upwards and it triggers a micro switch which turns the drain pump on whether the door is closed or open so long as the machine is switched on all that happens is the drain pump runs forever. That micro switch OR the unit it is attached to is faulty. BUT why the triac blew is a different matter and whether anything else on your circuit board is damaged is an unknown.Sometimes gently moving the rod up and down temorarily sorts out the micro switch enough to prove the point.

[Author]

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