Bosch SGS09A02GB/11 Logixx noisy pump/loss of pressure

[Chip_Pan]

Hi all, first post! Had a search for the model code and not found anything relevant – apologies if my search game is weak 😉

The machine itself is 5yrs old (1 month out of warranty :rolls: ) and has worked perfectly every day up until now.

When washing (not draining) the wash/circulation pump is making a low humming noise, and it sounds like the water is not being blasted around inside with the same pressure as it used to.

The dishes are still coming out clean, but I would imagine it’s just a matter of time before it packs up completely.

Any ideas on the likely problem? Worn out pump/motor? Blockages?

Thanks in advance!!

Also, I’d be interested to know if anyone elses machine does this:

When using dishwasher powders or tablets on the automatic program (when it decides how dirty the stuff is and how much water/heat to use), it frequently fills up with foam, which seems to confuse the sensors/controller, and it will just run and run circulating water until it’s stopped. This doesn’t happen on the ‘normal’ pre-set cycles – only auto. We’re using the finish liquid to stop this (although this seems to stain the door), anyone else have this?

[mikethemechanic]

Re: Bosch SGS09A02GB/11 Logixx noisy pump/loss of pressure

hi there from your describtion it sounds like it could be one of a couple of possible faults i cant be certain but il try me best to help:-

fault 1: if the appliance does not fill up with enough water the pressure is weak on the wash this can be due to a faulty dump valve which is located in the left hand side when looking at it from the front.
to test this you will need a multimeter it should read about 4 ohms.

fault 2:-the spray arms could be blocked with bits of food this is quite common and easily fixed unscrew the top arm and pull off the lower arm run them under the tap and swish the water back and forth basically your just trying to dislodge any crap thats in there some tims you can see the bits sticking out the holes in the arms before you even remove them.

fault 3:- if this appliance leaks it will fill the base causing it to pump all the water out but it will carry on washing with no water in there it could take 1 hour or 5 washs to fill the base depending how bad the leak is ( i dont think this will be the fault)

another thing to check is when looking at the dump valve also look at the pressure chamber you will know this if you see the surrounding microswitches these can also block and so can the hose that follows this
hope this helps please feel free to ask or info me of your progress
cheer Domestic Appliance Services an spares 😀

[Chip_Pan]

Re: Bosch SGS09A02GB/11 Logixx noisy pump/loss of pressure

Thanks for the quick reply!

I’ve checked the arms & they are all clear.

It seems to fill up OK – the level of water in the bottom when opened mid cycle looks like it’s the same as before.

It’s not leaking (yet)

I poked my finger up the intake for the circulation pump, and there was a small amount of stringy debris which I removed, so maybe it’s worth stripping this out and seeing if there’s any more stuck.

So you think the problem is more likely a blockage somewhere rather than knackered pump? Do they just tend to give up at once, or are they known to die slowly?

Can you use caustic cleaners to dissolve internal crud, or would this damage pipes/sensors?

Cheers! 😀

[mikethemechanic]

Re: Bosch SGS09A02GB/11 Logixx noisy pump/loss of pressure

i would be tempted to use a finish dishwasher cleaner to flush out the pipes the motors usually dont work or work but i have stripped them down to find a load of pips in the impellor that stops the pressure if this appliance leaks it wouldnt leak on the floor it goes into the plastic base try the cleaner as a first and then get back to me if you have a problem
domestic.apcare@hotmail.com

[Trilobite]

Re: Bosch SGS09A02GB/11 Logixx noisy pump/loss of pressure

Bosch machines can suffer from fill problems: yours will not be excepted.

Power off, before fiddling with anything!

Remove the filters. In the sump area, at the 6 O’clock position, you will notice a small hole tangentially set into the sump wall. This tube leads off left, curving back and upwards, to the fill matrix assembly. This tube has a tendency to become clogged with fatty/food deposits.

Using a small diameter bottle brush, rod out the tube GENTLY, rinsing it frequently. This may sort the problem. If not, disassembly of the side panel is required. Sometimes the fill pressure-vessel also becomes blocked. A blocked fill tube could also prevent the heater switching in, due to low water levels.

Conversely, the heater itself may have blown. Does the water heat up?

I myself, have the successor to this model (SGS09L08), the main difference being the ‘VarioFlex Baskets’. I have found that tablets do not work properly with my machine: they can cause over foaming, in which case the spray arm diverter valve seems to have trouble switching between the two baskets.

The older Chlorine-based detergents are still available, and they do not foam up anywhere near as much as the modern powders and tablets.

The liquid detergents use chlorine bleach, so would be a suitable choice.

The chlorine powders are sold through Cash & Carry’s, and Farmers’ Supplies Wholesalers. These powders typically come in 5kg and larger sizes; and are known as ‘Professional Detergents’ for hoteliers and the catering industry. Typical brands are: SUN, FINISH and BRYTA. From what I have seen personally, the BRYTA brand seems to be available in the smaller size; the others in the bigger size. Smaller sizes are better: detergents can lose their efficiency simply by sitting on a shelf for more than six months.

The chlorine bleach is more energetic at removing stains, such as tea or the dreaded tomato sauce. Stainless steel can come up brilliantly. Crockery has less of a smell, due to the absence of perfumes that the modern formulations use.

The downside is that glasses and fine decorations can suffer from etching and fading. (Using a separate ‘FINISH Protector’ clipped to the basket might help to counteract such effects). Some people may object to the smell of chlorine that is emitted during the wash process. Starchy food (mashed potatoes, rice or pasta) can be a little more difficult for chlorine detergents to remove successfully.

When using powder or liquids, remember to use salt in the reservoir, according to the local water conditions.

Also use Rinse Aid. It has several effects, in addition to assisting the drying process. Such effects are to prevent any particulates being re-deposited back onto the crockery. And being slightly acidic, it neutralises any detergent that might have made it through the rinse cycles.

[dpm]

OT: Trilobite, are you aware of whether the Sun domestic tablets are chlorine- based? We’ve recently been having very good cleaning results from some Sun tablets from a local Spar. I don’t think they were UK market products at all, plenty foreign lingo on the box and a dissolving sachet around a (IIRC) 2in1 tab…

[Trilobite]

Re: Bosch SGS09A02GB/11 Logixx noisy pump/loss of pressure

Hi there,

SUN tablets I have used; but of the “Professional” variant. These were sold in boxes of 100 tablets. Claimed to have glasscare function.

When they came out at first, the tablets were teardrop shaped. Nowadays they are rectangular.

They definately use enzymes, oxygen bleach and possibly a manganese-based bleaching activator to improve the cleaning performance. These were of the ‘detergent alone’ type (not 3in1, etc). I think SUN now has multifunction tablets available.

I found them to be effective, not too bad concerning foaming; but I thought that they left an odour on crockery, and a smell in the machine.

I gather that the SUN brand is no longer the brand of choice in Britain; that went to FINISH. I believe that SUN is still a prime choice in Ireland, and also the Netherlands. This will probably be where your detergent was meant to be sold.

I have a pack of SUN powder that has a Netherlands phone number on it!

[Chip_Pan]

Re: Bosch SGS09A02GB/11 Logixx noisy pump/loss of pressure

Thanks for the advice!

I’ve run the Finish dishwasher cleaner through it, then a couple of tabs of the Sainsburys own brand stuff too. As far as I can tell, the pressure seems to have returned to normal, but the pump/motor is still making the same noise.

I’ve felt round the intakes as described above, and can’t find any residue at all, but until I get a bottle brush I can’t see if theres any more gunge further up the pipes.

It’s interesting what was said about the chlorine based liquids (ie Finish) because it has etched the glasses, and has also stained the door, and doesn’t deal with mashed potato very well! I’m surprised the tablets haven’t been reformulated, as I’m sure more and more dishwashers have auto programs and would suffer from foaming – unless this only happens with the Bosch dishwashers 😕

Anyway, I’ll see how it goes, although if it’s working, but a bit noisy, I’m a bit reluctant to take the panels off, in case I finish it off completely 😀

[Author]

Posts