I have a bosch dishwasher that appears to be working but stuff on top shelf does not appear to be washed correctly.The water does not appear to be getting to the top sprayers aswell as it used to. Pump works ok not apparent blockage .Running pipe up back in good order????
The pressure is less to the top shelf anyway, so faults tend to appear there first. Can you be sure that the water flow is worse, as it is generally lower in any case?
Take the spinner arm off the top (you HAVE been cleaning it regularly, haven't you?) and make sure that if you run water into the centre, it comes out of the holes.
Could just be gunged up anyway...run some dishwasher cleaner through it, maybe more than once (I do it monthly).
Lastly, if you use salt...has it run low? Or the hardness selection lever been moved?
Had a Neff with the same problem, and they use a diverter valve which alternates the top and bottom spray bars. When I called an engineer he said the problem was down to lack of water level and put some dishwasher cleaner in which did nothing. I spoke to a Neff engineer and he said the diverter valve was probably faulty ( I had replaced the dishwasher by then). It could be similar with a Bosch.
Some dishwashers allow the top shelf to be on one of 2 levels. The top sprayer is fed by a pipe with 2 branches where there are valves so that water doesn't pour out of the unused feed. If this is the case, make sure the valve is seating firmly and no offending article is keeping it open.
Mmm - not sure about this - it isn't fixing the problem in fact it could make it worse by diminishing the pressure of water projected upwards. The objective is not just to rotate the bar - but to squirt lots of water upwards. Letting more water out horizontally will reduce the amount available for spraying upwards.
Could it be a worn pump - giving a reduced pressure (Impeller blades eroded)? However, I favour the diverter valve problem - has it been set on 'lower basket only?
Incidentally, on a machine I had it was possible to fit the top bar upside down for use if you always did half loads. Does this apply?
What is the cause of dishwashers needing cleaning - I have not cleaned one on 20 years of owning them. Except for wiping the area at the bottom of the door seal. However, I clean the filter several time a week. Is it down to water hardness?
Grease build-up (I don't have control over what is on the plates....); that, and general gunge in the pipes.
Once a month I clean all the filters, wipe and clean the entire door seal area, and run some dishwasher cleaner through it. Eight years old and all it's needed so far is a new filter (old one fell apart) and a new drain hose.
Nah - the volume of water from the side jets is a fairly small fraction of the total. As I said, it worked for me.
I don;t think that was the problem for me. My dishwasher was only a couple of years old when it developed the problem. Having run it briefly with the door interlock defeated (and getting wet, expectedly) it seemed to me that there was a lot of water escaping from the rotor arm bearing. Looking closer at the bearing, I think it a design fault leading to both an increase in friction and a decrease in the ability of the bearing not to piss water everywhere (which reduces pressure to the arm).
Mine's got a water block matrix to recover heat from the expelled water back into the incoming fresh water and the pathways are tortuous and prone to trapping grease. For some reason, despite dishwasher power being fairly vicious stuff, it still leaves gunk which cleaner liquid is able to remove. Don't ask me why...
snipped-for-privacy@ntlworld.com coughed up some electrons that declared:
Good test - I didn't try that...
Have a look here:
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have exploded parts diagrams for Bosch which should help you to see. I've used them to source spares for my dishwasher and tumble dryer - they are very reliable IME.
We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember snipped-for-privacy@ntlworld.com saying something like:
Not sure about your Bosch model, but on my Hotpoint there's a level float switch behind the left side panel. I found the microswitch arm on mine to be sticking and needed to be bent slightly. Also check the float pivot for wear.
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