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Hi,
there are a couple of problems with our machine, which has an AQUA sensor which means that the program times vary supposedly depending on how clean the water became.
An application of dishwasher cleaner has not helped.
Most odd is that it sometimes does not complete the cycle. Either the countdown stays on ‘1’ for a long time, or sometimes it actually counts up a little at some point. It also seems to be very variable how warm/dry it gets everything.
Sometimes the time displayed on starting is also extremely high – 160+ minutes.
Any help much appreciated!
/RM
Sounds like a heating problem. If the appliance doesn’t heat the water , either on wash or rinse , it will continue to count down to 1 and then seemingly ‘stick’ at this number.
There are normally 3 possible reasons and i’ll list them in order of possibilty –Low water levels caused by blocked pressure chamber/fill hose.
Blown heater relay on main PCB
Faulty Instantaneous Water Heater.
Does the appliance make any ‘kledunking’ noises as it fills ? After running for approx 5 mins , there should be enough water in the base to reach the bottom edge of the salt pot lid. If you can’t see that amount of water , then option 1 is your most likely reason.
The reason it sometimes has a much longer start time is that it initially works off the total cycle time from the previous wash. So , if the last wash had the no heating fault , its wash time would have been extended and this would have transferred to the beginning of the next cycle selected.
Re: Bosch SGU43A02SK/27 countdown reverses
It certainly heats – possibly intermittently, its hard to tell.
I have since the post opened the machine up: heres what the water inlet side looks like.
http://temple.dk/tmp/inlet.jpg
Quite a bit of gunk in it: possible cause?
Certainly the filling sounds – and looks – “intermittent” – and after 5 mins, there is not a fill level of water in the base – as I open the door, the water runs into the sump and the base of the machine has no sitting water.
I also noticed as I opened the door that the upper arm does not appear to be rotating, although there is definitely water spraying out of it.
I have earlier had the PCB out for inspection and there were no obvious blackened areas or bad joints.
What do you think?
Thanks!
/RM
Re: Bosch SGU43A02SK/27 countdown reverses
Bottom right of the picture is the pressure switch. Bottom right below that is the transfer hose from the fill matrix to the sump. If they appear to be full of muck and goo, remove and clean thoroughly. The pressure switch will fully dismantle for cleaning.
The machine will underfill due to the blockages. If the machine underfills, the heater will not function properly, the computer gets confused and you can finish up with “1” in the display.
Stay safe – power off, first.
Penguin45.
From your pic , the pressure chamber is on the bottom right corner , with the switches on it . It will certainly need cleaning out…( If you can . Us Bosch engineers tend to replace them )….and there is a ribbed hose , emerging from the bottom right hand corner of that pressure chamber that goes round the bottom edge of the front of the machine into the sump. You’ll probably find that very well sludged up too.
Its actually a very good pic with which to explain the fault probs. The water flows through the water inlet matrix ( the tall item on the left ) through the pressure chamber through the ribbed hose into the base.
If the ribbed hose is blocked , water backs up and this causes the pressure chamber to think its full of water and therefore stop any more water entering. This is why you get low water levels and no heating. This ‘backing-up’ may also cause the red ‘barrel’ to rise , which operates the drain pump and so can pump some of the already filled water out.
Also , the blue arm is the level switch so with all the gunk in the pressure chamber beneath it , this can also cause false readings and low water levels.Clean out the pressure chamber and ribbed hose and i reckon you’ll be hot to trot !!
Please power off before carrying out any work
p.s Penguins are so much more succinct than wanderers 8)Re: Bosch SGU43A02SK/27 countdown reverses
Excellent explanation – thanks a lot! I will get to work..
😀
/RM
Re: Bosch SGU43A02SK/27 countdown reverses
Well, that fixed it! 😀
Completely different fill sequence – and now the rotating arms also rotate…
It looked too difficult to get the hose off, so I just poked the crud loose on the assumption that once the water flow was better, it would get flushed out. It looked completely inaccessible to put back on: or is there a trick here?
How about the crud in the left hand two pipes of the water inlet? Will that get cleaned out if I regularly use dishwasher cleaner from now on 😉 or should I sort that out ASAP also?
Thanks for all the help.
/RM
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