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How to Remove the Main Control Board in a Bosch Ascenta Dishwasher

Posted by Samurai Appliance Repair Man, in Dishwasher Repair 17 October 2014 · 237 views
Bosch, Ascenta, dishwasher and 1 more...
The Bosch Ascenta line of dishwashers disassemble very differently from the older Bosch dishwashers you may be familiar with. In the older Bosch's, the main control board is easily accessible in the door control panel, just like you would expect. But not with the Ascenta line. The Bosch engineers thought it would be a great idea to put the main control board way down at the bottom in back of the dishwasher so you have to pull the whole dishwasher out to get to it. Brother Chat calls the dance steps on this procedure:

Tools needed: # 2 Phillips and flat blade screwdrivers
1. Disconnect & pull out dishwasher.
2. Unplug power supply cord from rear of power module.
3. Lift off tank fleece insulation from right side of dishwasher.
4. Lift off cover from power module
5. Two plastic base tabs hold the power module in place. To remove power module, gently pry base tabs until they clear module and lift the module up from the base. If necessary, gently pry up the rear of the power module.
6. Disconnect top / side wire harnesses from power module, making sure to remove the harnesses with their caps, not individually.

Not all terminals are used. To protect power modules, two plugs are used to cover unused terminals.

TIP: Check error codes before replacing power modules. Many good power modules are replaced and faulty parts aren’t replaced, causing repeat calls.

CAUTION – 80% of all controls returned for analysis check out OK. Most control issues are due to loose connections and error codes for other parts.



And here's the service manual for the Bosch Ascenta dishwasher: Bosch Ascenta Dishwasher Service Manual, 2nd Edition

Source: Bosch SHE6AP06UC/06 dishwasher


The Fix for a Samsung DMT800 Dishwasher with Error Code oE

Posted by Samurai Appliance Repair Man, in Dishwasher Repair 14 June 2014 · 2,159 views
Samsung, dishwasher, oE and 1 more...

Part number: DD94-01006A

Part number: DD94-01006A



Usually a fouled up sensor, listen for the dishwasher to fill and then drain again right away...



Source: Samsung dishwasher model DMT800RHS error code oE.


Retrieving Fault Codes Stored in a Bosch Dishwasher Control to Help Troubleshoot a Problem

Posted by Samurai Appliance Repair Man, in Dishwasher Repair 02 April 2014 · 839 views
Bosch, dishwasher, fault codes
Bosch dishwasher not heating? Stalling in cycle? Not filling? Some other weird problem? Wouldn't it be nice if you could get just get some clue about what's wrong? Well, you can!

All Bosch dishwashers (and most modern appliances that use electronic control boards) store fault codes pertaining to specific areas the appliance is having a problem with... or at least the areas that the control board thinks is having a problem. Anyway, it's a good place to start. These control boards all have a secret key dance to enter that secret service mode and receive those error codes.

Now, for the first time ever in the history of the Interwebs, Brother PDuff reveals the super secret key dance to enter service mode and retrieve the stored error codes. Let's listen in...

You can try to access the test program to retrieve possible fault codes:

With the door closed, press and hold the second and fourth buttons to the right of the display while pressing the On button.
As long as these two buttons are pressed, the associated leds will light, then the display will show the model coding identifier. Release the two buttons.
Press the same two buttons to display any stored fault codes:

0 = No fault
1 = Fault in Hydro Sensing system
2 = Heater fault
4 = Fill fault
8 = Fault in NTC system
16 = Water switch cannot be positioned

Note: If more than one fault is detected, the fault code is added up. Ex: Fault code 3 = fault 1 + fault 2.

Press Off to exit.



Source: Bosch Dishwasher heatin problem


The Silver Bullet Fix for LE Error Codes in LG Dishwashers

Posted by Samurai Appliance Repair Man, in Dishwasher Repair 06 December 2013 · 679 views
LG, dishwasher, LE, error code and 1 more...
Of all the error codes seen in LG dishwashers, the LE error is probably the common one asked about in The Samurai Appliance Repair Academy Kitchen Forum. So much so that it seemed like this one needed a Silver Bullet answer. And who better to fire that silver bullet than the Dean of LG Appliantology himself, john63. Y'all go grab you a cold one and let's listen to the big guns going off:

Replacing the SUMP ASSY (AJH31248604) and protecting/repairing (as needed) the Wire Loom inside the door assembly---will resolve your immediate problem ("LE" error).

The "LE" error is *extremely* common for all LG dishwashers built from 2004 through mid-2008.

The cause of the Wash Motor failure is due a process during manufacturing---that degraded/damaged the Wash Motor.

Replacing the entire Sump Assy makes perfect sense in this case (as opposed to just the Wash Motor) since the new design Sump Assy has a much better design internal gasket.
The original Sump Assy gaskets were extremely challenging to re-install (disassembly is required to replace the Wash Motor).
Replacing the Sump Assy---also has the benefit of having a new...

1) Wash Motor
2) Heating Element and internal Thermistor
3) Drain Motor
4) Soil Level Sensor
5) Vario Motor (switches water from lower washer arm-to-middle and upper wash arms---every 90 seconds)

After removing the door panel----inspect the Wire Loom from the bottom of the door-up-to-the-Detergent-Dispenser-Assy.

Repair wiring as needed.

Wrap the entire Wire Harness with electrical tape---from the bottom of the door up to the Detergent Dispenser Assy

Insert a cardboard cut-out---behind the Wire Harness---to further isolate the wiring from the Tar-Like Thermal/Sound Insulation of the door liner.

**********

<<<I haven't fixed appliances before, but I'm a DIY guy in general.>>>

**********

In that case---I'll provide some recommendations to further improve the dishwasher performance & reliability (especially if you are planning to replace the Sump Assembly).

Replace the following items:

1) Guide Assembly (4975DD1001A)

The Guide Assembly has been updated (improvement)---to eliminate the oft-elusive symptom of once-in-a-blue-moon water leaking from the lower corner of the door.

Replacement Guide Assys include a new FLOAT ASSY. Not only has this been re-designed (elimination of Styrofoam floats)---but since Tri-Sodium-Phosphate (TSP) is no longer used in dishwasher detergent (beginning July 2010---many FLOAT ASSYs are becoming clogged with fatty/greasy residue. This in turn---causes incorrect water fill/filling then draining/poor wash performance/water-on-floor-complaints.
This accumulation of sticky residue is becoming so commonplace---that replacing the Guide Assy is virtually mandatory (when I service an LG dishwasher).

Prior to July 2010---TSP in dishwashing detergent would chemically-react with the fatty/oily deposits in the dishwasher---and CONVERT it to a soap/detergent.
This chemical change (fat-to-detergent) is called "Saponification".
Today---dishwasher detergent cleans---not by saponification---but by "Enzyme" method (breaks down fatty/oily deposits into smaller pieces).
Hence---the oily/fatty residue remains with the wash water---and ideally or in theory---should be eventually rinsed/drained from the dishwasher---provided that the cycle duration/run time is longer than a "normal" cycle AND the wash/rinse water temperature is hot enough to effective remove the residue---sufficiently.

My experience has been that---over time---deposits will gum-up the Guide/Float Assy (and the hose leading to it from the Sump Assy) to the point of rendering the dishwasher essentially useless.

It's also why I believe that LG introduced an all-new re-designed dishwasher---shortly after the TSP-ban (entirely different water level sensing method---a water frequency sensor rather than using floats).

As an option---the Drain Hose (AEM6943803) can be replaced as well. This re-designed hose is intended to be used with the (also re-designed) Guide Assy. The correction was to prevent loss-of-wash-water during the Wash Cycle---especially in situations where the drain hose has been incorrectly installed into the floor---to a drain connection in the basement/crawl space.
This would eliminate "air sucking sounds" and heating element damage due to frequent insufficient amount of water in the tub during the cycle.

Lastly---installing a new (yes-re-designed) Filter Assy (ADQ32598202) can reduce the possibility of hard debris entering the Sump Assy during the cycle. The filter area has smaller openings to resist glass shards and other debris---such as a toothpick.

Before I forget---if you've replace the Sump Assy---and all works beautifully---but now you're noticing a whistle/growling sound during the wash cycle---post back:)

The CHOPPER/MASCERATOR was inexplicably changed from a good design with not-so-pointed ends on it----to a design which best resembles the tip of an indian arrowhead.
This pointed tip---causes whistling and/or grinding during wash.
The original Chopper was brought back---to stop the noise complaint (sigh).

Good Luck!



Source: LG LDF6810ST Error Code "LE"


How to troubleshoot a Bosch dishwasher that won't finish a cycle, runs forever, or shows 2H in the display

Posted by Samurai Appliance Repair Man, in Dishwasher Repair 29 November 2013 · 1,618 views
Bosch, dishwasher, cycle, heater and 1 more...
This is always a problem with the dishwasher's water heating system. In Bosch dishwashers, if they can't heat the water enough, they'll just keep running until they do. Kinda dumb design, I think. In comparison, Whirlpool-built dishwashers at least give you an obvious fault code like the clean light flashing seven times. But, I rectum that's my Pro-Amerkan bias bleedin' through. :blinky:

Water heating problems in Bosch dishwashers come down to one of two problems:

- problem with the control board not sending voltage to the heater assembly or

- problem with the heater assembly itself

How's a brutha supposed to know which is which? Ah, Grasshoppah, come with me now on a journey of Total Appliance Enlightenment ™...

Remove the front panel so you can access the control board wiring.

Put one lead of your meter in the control board where the red wire connects. That's the heater power supply line. Attach the other lead of your meter to chassis ground.

Start the dishwasher in Quick Wash.

You're looking for 120vac on your meter. Wait for it, wait for it...

If you don't get 120vac there, you're done: order the new control board based on your exact, complete model number.

If you need help opening the dishwasher door and accessing the control panel, see this video.

If you get voltage there, then you know the control board is working for the Quick Wash cycle. However, I have seen several times where the control board puts out the voltage on the Quick Wash cycle but not the Normal cycle. At this point, you need to make a current draw measurement through the red wire to see if current is actually flowing through the heater now that you're getting voltage (about 9 amps for a good heater). If you are getting current, this confirms that the heater is good; again, replace the control board. If, OTOH, you are NOT getting current flow with 120vac present on the red wire, then you need to replace the heater assembly, the specfic heater you need will depend on your exact, complete model number, which is always read from the tag on the dishwasher itself, not from the paperwork or useless User Guide.

Go ye forth and conquer!






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