Do Dishwasher in "autoclean" mode know if it needs another rinse?

[mark_wpduet]

OR... is that just for food particles? In other words, does the machine know if there are traces of soap left and add another rinse? If so, would this be true with all dishwashers that have an autoclean cycle?

 

[johnb300m]

Typically, no, at least not any of the American dishwasher brands.
The way sensor cycles typically work is they sense low, medium or high soil. And those each have a set cycle sequence. So it’s possible the medium and/or high soil settings will have one or two added post-rinses.

 

[henene4]

If it has an optical sensor, there's really nothing stopping it from doing so.


Though, it's not directly sensing for any detergent residue.
Keep in mind that with dishes, you have a high amount of soil in a small amount of water AND dishes don't really retain much water from step to step. Some, but compared to what laundry would hold as a percentage of water in the machine vs water in/on the items, a very small amount.

And most of the turbidity would probably come from any soil suspended & emulsified into the water, not the detergent itself.
So, if there is something retaining more water than usual and/or that water has a particularly high amount of soil in it, that's probably what would trigger another interim rinse.


I know that Vestel and Bosch do use the optical sensor in the first interim rinse to check.
I don't think Mieles G5000/G7000 design does, I think that just goes off of load size and soil level.

 

[vacerator]

The only reason I can imagine an extra rinse would be needed is if you were washing a light wash load with only two rinses, and put detergent in both dispensers. Otherwise full cycles like normal, heavy, cookware or anti-bacterial all have 3 if not 4 rinses.

 

[lakewebsterkid]

As others have said, most of the time, no.
Our KA on ProWash does purge after first rinse rarely with high soils. Otherwise 2 standard rinses. Our Bosch on Auto would do purges if needed between prerinse - wash, wash - first rinse, first and second rinse, but never added a full rinse. I still feel the KA does a better job of rinsing.

 

[henene4]

Bosches for sure can - I've never seen a BSH DW do it, but it certainly is in the programming.


It's actually best to see in higher end Siemens model usage data.
Quick explanation: brilliantShine is a marketing term used by Siemens for a combination of Zeolite drying, a special valve allowing for more exact water hardness control and the extra shine option/cycle.
That option (and in turn the cycle) adds a second Interim rinse - as far as I understand with rinse aid used. So 3 interim rinses, 2 of those with rinse aid. (And adapts drying, supposedly.)

Most cycles as standard do a pre-wash, main wash, rinse, hot rinse and dry.
There's also load sensing fuzzyness - but in general, a 4 fill cycle like that will usually not use more than 12l/3.1gal of water.
Some cycles come close - the 90min cycle uses 11l for a 3 fill cycle as it does use higher spray pressures, and Eco goes down to 9.5l even though it does up to 4 full fills.
The Silent cycle - while based on Eco - uses 1l more being the same cycle.


And as you can see, the upper end Auto usage lines up closely with the brilliantShine cycle, which does do 5 fills total instead of the typical 4.
It does have the option - but I don't think I've ever seen it trigger.