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Hi. I have spent hours reading posts on this forum and many topics are close to my problem but I still can’t get my machine to work properly. Here it goes. The machine is three years old. A couple of weeks ago I noticed the drain pump didn’t turn off at program end. It just keeps on running. I have removed all panels. No water in bottom tray. Can not spot leakage anywhere. Everyhings dry and clean. The ribbed pipe from the metering unit is clear and fine. At prgram start, it fills upp the matrix (?) up to the top, water goes down in the meter area (lots of small pipes with micro switches) and one of the micro swithches goes into operation (little blue arm swings out) the drain pump empties everything (blue arm return to initial position). At spin, everything seems normal except that the drain pump is running, leaving the system with no water and the machine just sits there with the drain pump running. Have disassembled and reassembled the control panel, nothing looks damaged. How can I determine if it is the control board or something else. I live in Sweden, found this great forum, dont know if my model number applies in the UK.
Re: Bosch SHU46A52SK/56 drain pump dont stop
One other thing… when I turn on the main switch and press the two buttons on the control panel to RESET, the time indicator goes to “0” but the drain pump doesn’t stop. Also, if I open the door, the pump is still running. Again, no water is visible inside the machine (only under the filters down low in the sump) and the base plate is dry and clean.
Re: Bosch SHU46A52SK/56 drain pump dont stop
Given your excellent description of what is happening, I would think you have a problem with the computer board. If you switch on and the drain pump starts to run immediately, there is probably a triac which has failed in the “on” position.
New PCB required, or some electronic repairs.
Regards,
Penguin45.Re: Bosch SHU46A52SK/56 drain pump dont stop
Perhaps you’re right. Hm, puzzled if I’m to take my chances and replace the board my self for €100. The problem may go away, or not. Or to call in engineering which will be twice the cost minimum.
There was another thread “Bosch WET2820GB/13 – Filling and draining” describing a machine with symptoms very similar tp mine. But there, changing the board didn’t help. The problem was due to a “broken wire”. Wonder which one?
Re: Bosch SHU46A52SK/56 drain pump dont stop
Don’t worry about that thread – it is describing a washing machine fault, not a dishwasher one.
100 euros sounds really cheap for the pcb board – you should see the UK prices for these things!
Penguin45.
Re: Bosch SHU46A52SK/56 drain pump dont stop
A washer machine… oops sloppy reading late at night. Sorry about that.
Just one more thing. The manual doesn’t explain how to start the test program but I think it starts by pressing the two reset button while turning on the main switch. Two leds starts to flash, can’t really tell what’s happening during the test cycle, acts kind of random, bu afterwards if you press buttons on the control panels, digits appear on the display. One button gives a “1” in the display. Could it inidicate an aquastop problem? I have seen something about error code 1 on Bosch meaning aquastop failure. My machine tajes in water for sure but what if the pressure is bad? Can the aquastop unit activate the drain pump via the cables from the aquastop to the machine? Pressing another buttons on the control panel makes the display show “188”.
Re: Bosch SHU46A52SK/56 drain pump dont stop
Got bored at analytical and logical thinking. Stared at the bloody thing. Whacked the front near the control panel with my right fist. The drain pump stopped. (!) Whacked it again, started, again, stopped. So, the PCB is the problem. It doesn’t seem to be something wrong with the connectors as fiddeling with them gives no result. The PCB looks fine, can’t see any bad joints, black areas or similar. So it must be inside one of the relays, triacs or whatever the black cubes sitting there consist of.
Can a dish washer sound beautiful?
A million thanks to you guys responding to a lost Swede, for all helpful thoughts and advise and for pointing me towards the PCB. Although hoses are fun too. Btw my co-workers heard I was up 3 am rinsing a water matrix, asked me to see a doctor.
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