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 Posted: Sat Sep 4th, 2010 08:09 am
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john63

 

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With the recent ban on *phosphates* in dishwasher detergents---servicers can expect an uptick of POOR / NOT CLEANING complaints in virtually all brands & model dishwashers.

On the LG dishwasher---and many other brands---a SOIL / TURBIDITY sensor is used. This sensor is used to provide feedback to the MAIN BOARD as to the condition of the water draining from the dishwasher.

If *particulates* in the water draining out---disturb a light-beam emitted by the sensor---this "tells" the MAIN BOARD that the dishes are not clean yet.

On the other hand---if the draining water has no particles or solids disrupting the sensor signal---the MAIN BOARD will begin a TERMINATION-OF-CYCLE at a much faster rate than might otherwise have been the case without a SOIL / TURBIDITY SENSOR.

This means that----if a customer chooses the l-o-n-g-e-s-t wash cycle in an LG dishwasher---and the drain water has become "clear" very early in the cycle---the MAIN BOARD will reduce the amount of total run-time of the cycle in an effort to reduce water & energy useage.

While this is an interesting technology--it does present its own set of problems. According to a *reliable source* of mine (never-to-be-named to protect the innocent), the *programming* in the LG MAIN BOARD is a bit aggressive at reducing the run-time of the cycle if the SOIL / TURBIDITY SENSOR feedback indicates that the draining water is clear earlier than expected (all manufacturers are hell-bent on claiming to be the MOST efficient appliance maker).

If an LG dishwasher is NOT cleaning dishes adequately and all of it's components are functioning---and there's no issue with abnormally hard water or problems with the hot water supply (such as an INSTANT HOT WATER HEATER)---this leaves two possibilities:

1) The customer may need to try experimenting with different brands of dishwasher detergent to find the one that works best.

2) The SOIL / TURBIDITY SENSOR is triggering an earlier *termination-of-cycle* command---resulting in less-than-satisfactory wash results.

My source has informed me that by *disconnecting* the plug on the SOIL / TURBIDITY SENSOR will cause the cycles chosen by the customer---to run at their maximum allowable run-times---WITHOUT TRIGGERING ANY ERROR MESSAGE. 

In other words--by simply disconnecting the sensor (at the bottom of the SUMP ASSY) this vastly improves the wash results by not having the MAIN BOARD / software reduce run-times for any selected cycle.

If you find this tidbit of information fascinating---that's just the tip of the iceberg :)

It's priceless these days to have "good / reliable sources" in the right places.

 

Last edited on Sat Sep 4th, 2010 03:56 pm by john63

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 Posted: Sat Sep 4th, 2010 02:53 pm
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Samurai Appliance Repair Man
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john63 wrote:

It's priceless these days to have "good / reliable sources" in the right places.



That's the name o' da game! Domo, John! :dude:



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 Posted: Sat Sep 4th, 2010 05:23 pm
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KurtiusInterupptus

 

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i do find that tidbit fascinating and would like to hear about the rest of the iceberg...



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