Thread Number: 94337  /  Tag: Modern Dishwashers
Miele G7000 Series Soil Sensing
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Post# 1190319   9/20/2023 at 13:33 by Labboy (SD, CA)        

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For the Miele G7000 series dishwashers, is it an optical soul sensor? Any idea as to where itís located?

Also, do they sense soil / adjust in all cycles or just the Normal cycle? The manual as vague and implies itís in all cycles except Rinse Only.


Post# 1190320 , Reply# 1   9/20/2023 at 13:48 by henene4 (Heidenheim a.d. Brenz (Germany))        

There is a soil sensor, I think it's in the sump area - last I remember I saw it there in mine, but could be wrong.

Their is load sensing on almost every cycle on the EU version.
Haven't actually witnessed soil sensing on anything but Auto (and I assume Normal on the US version).

Most cycles also use sensor drying much alike older gens.

There is further guided energy usage.
Heating isn't necessarily done by temp, especially on the final rinse.
It has a certain energy budget that it uses for certain cycles - if the main wash uses more, the rinses drop in temp slightly and drying is extended in turn.

The cycle with least sensing is QuickPowerWash which mostly just goes full boar on most things.

That's on my very early G7100SCi - so things might have changed a lot.

Post# 1190514 , Reply# 2   9/23/2023 at 17:54 by Jerrod_Six (Eastern Pennsylvania, USA)        

I have the previous 6 series which has a similar sump except for where the wash arm gets its water supply. The soil sensor is in the sump. My previous Miele DW had the sensor in the top right water supply pipe for the upper rack. I don't know if it is optical or what it is since it's not like you see anything when it is operating.

Mine only uses the sensor in the Normal, and Sensor Wash(Auto) cycles. For the normal cycle, there is little to no variation in the cycle time or wash sequence. There is much more variation in the Sensor Wash program which varies the wash and rinse time as well as the spray pressure used.

On mine, the sensing is done near the end of the prewash, and in the main wash, after 9 to 12 minutes. Sensing is done while the DW is spraying and the only way you can tell it is happening is when the spray pressure reduces for about 20 seconds. Following this 20-second sensing, there may or may not be a reduction in the cycle time, and then the spray pressure resumes. In the Sensor wash cycle after sensing if the soil is light, the pulsed spray starts immediately and you get a main wash that lasts about 26 minutes in total.

Post# 1190534 , Reply# 3   9/24/2023 at 05:35 by henene4 (Heidenheim a.d. Brenz (Germany))        
Point of sensing on Auto/Sensor Wash

The G7000 I have does the load size sensing at the very beginning of each cycle.
It starts with minimal spray pressure on one rack, ramps the pump up slowly, and if it cavitates it changes to the next rack, adds a bit of water and does that all over until it cycled through all the racks once without cavitating which usually takes no more than 3min.

Then, after 10min of prewashing, it drops the pump speed down and does the sensing.

Then it decides and either switches over to main wash or stays on prewash.
Either way there are further 10min of washing before the drain or detergent release.

On cycles with a prewash but no soil sensing, the prewash is notably only about 10min instead of about 20min.

Post# 1190569 , Reply# 4   9/24/2023 at 16:02 by Jerrod_Six (Eastern Pennsylvania, USA)        


I wish mine handled the prewash like yours. Mine will not drain the prewash water no matter how dirty the load I give it and it always lasts 9 minutes. Instead, for heavy soil, it will extend the wash to almost 2 hours, and extend the first rinse. I don't like that technique. I can select the program options and add a prewash and that one takes the place of the regular 9 min prewash. At the end, the added one lasts 12 minutes and will drain the water before the wash. I have the 6987 which is a series behind the 7. Perhaps there is hope that Miele has improved on the prewash handling.


How does your 7 series deal with the prewash?

Post# 1190602 , Reply# 5   9/25/2023 at 06:56 by henene4 (Heidenheim a.d. Brenz (Germany))        

Do you run the "Normal" or "Sensor" cycle?

If it never actually drains after the prewash, that is indeed odd - my full loads almost always trigger a prewash, and the G4000 at work also almost always drained after the prewash.

Maybe that's an US programming quirk.

Post# 1190639 , Reply# 6   9/25/2023 at 16:54 by Jerrod_Six (Eastern Pennsylvania, USA)        

I have tried using both and neither will drain the pre-wash water. I prefer the Sensor cycle because there is more variation in the cycle and even a reduction in water, time, and spray pressure for medium and lighter soil. If you check the user manual for the G6987, the program chart shows a range of temps that might be used for the Normal cycle but doesn't show any variation taking place in the actual cycle and the machine seems to stick to it's script. You can manually add a prewash in the cycle options and that one will replace the original cycle prewash and it will change the water.

The only cycle on the machine that will change the pre-wash water is Pots and Pans. It has two pre-washes but even then, after the first, there is a partial drain, then and about .3 of a gallon of water is added and the second prewash starts. This second one does a complete drain before the Wash.

Sanitize starts with the wash so no prewash unless you add one. If you use the quick option on the sensor cycle it skips a prewash and starts with a wash. I think the lack of change is probably a USA thing or one of the quirks in the 6 series. I prefer the Sensor cycle and use that for my regular loads.

Perhaps I need to try washing an entire chocolate cake and see what happens.

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