Bosch dishwasher shu4322 has code 1 aqua sensor what is the sensor do and where is it located

The statement below can be found at: http://www.ehow.com/list_6978265_bosch-dishwasher-error-codes.html,

The SHU4326 and 4326 models use "Regular Wash" and "Rinse Hold" to begin the test while the other three series in this section use "Scrub Wash" and "Delicate/Econo," but all use the same set of fault codes, shown not as lights but as numbers on the Cycle Countdown display. Here, 1 is an aqua sensor fault, 2 is a heating fault, 4 is a filling fault, 8 is an NTC fault and 0 means that everything is working as it ought. During an actual wash, when you aren't testing, the Cycle Countdown display may show the letter "F," which also signifies a filling fault.

Read more: http://www.ehow.com/list_6978265_bosch-dishwasher-error-codes.html#ixzz33JutQVQR

Hello Brien, First let me start by apologizing for the difficulty you've had here at FixYa. It is unfortunate the assistance (or lack of) was not helpful or specific to your inquiry, but I'd like to attempt to make amends. I am quite familiar with your model and in fact have serviced Bosch for around 15yrs. When you receive the timer (It is very rare to need one in a Bosch, more likely stat on the inside door panel) I'd be more than willing to guide you through the process and I will even send you a complimentary service manual if you provide an email address. I will understand if you have closed the door on any further input from "experts" here at FixYa but will do what I can to help if you're open. Sorry once again and good luck going forward. Regards, Macmarkus :)

Hello,

Welcome to FixYa.


There was indeed a recall involving the control replacement nearly two years ago now if I recall.

As for checking into the present issue ( it doesn`t sound like anything to do with the control based on your description ) it sounds like the pump impeller may have become stuck. Did the dishwasher sit idle or in storage unused for a period of time ?

I have a service bulletin I could send you via email regarding remedying that issue of stuck impeller if you contact me at [email protected]

I`d suggest you run the dishwasher through a diagnostic, but either procedure will require hooking it up.

To do this test/diagnostic on the SHU4322 series machine, it is as follows...

To start test program, press and hold both REGULAR WASH and RINSE & HOLD program buttons, then turn unit on by pressing ON/OFF button. Initially, control module version # will be displayed (e.g./ "20" = version 0 without jumper).

When wash program buttons are released, lights above them will flash. To end test program, press ON/OFF button.
To check each program indicator light, press its button. To check Cycle Countdown display, Refill Rinse Agent light and REGULAR WASH light, press REGULAR WASH button (press Delay Start button to test Cycle Countdown display alone).

Cycle Countdown display will show "88" when REGULAR WASH button is pressed and "8h" when Delay Start button is pressed.
To start testing, press both the REGULAR WASH and RINSE & HOLD buttons a second time.

When testing has ended, Cycle Countdown display will show a fault using codes below. If more than one fault occurs, code numbers will be added together, (e.g./ "6" = faults 2 + 4).
0 = No faults detected 2 = Heating fault 8 = NTC (temperature sensor) fault 1 = Aqua Sensor ("Sensotronic") fault 4 = Filling fault F = Filling fault (display occurs during wash, not test)

0 = No faults detected
1 = Aqua Sensor ("Sensotronic") fault
2 = Heating fault
4 = Filling fault
8 = NTC (temperature sensor) fault
F = Filling fault (display occurs during wash, not test)


To check for heater, high limit or flow switch problems, start testing until heating starts. Using a meter with a current coil, measure current going into dishwasher. If current is ~ 11 A, then heater, high limit and flow switch are OK. If current stays at ~ 1.5-2 A, then heater, high limit or flow switch are faulty.

i.e.



If water level switch has failed (opened), display will show fault code "4" and unit will continually fill and drain where testing won't be completed. If flow switch has failed (opened), display will show "0", water won't heat (to 150?F) and water won't stop circulating. If NTC probe has failed (opened), display will show fault code "8" immediately and testing will end shortly after water has started circulating.


What needs to be done to solve the problem will depend on the results/findings of the dianostic, so let me know what you find and we can go from there.

Either way keep me in the loop and I`ll assist you the best I can. Thank you for choosing FixYa and good luck.

Regards,

Macmarkus :)

Hello Dave,

Welcome to FixYa.

Try this test I posted below and let me know what error you find...if any.

To begin the test program, press both the SCRUB WASH and DELICATE/ECONO wash program buttons at the same time

as you turn the unit on by pressing the ON/OFF button. Initially, the control unit version number will appear in the display

(e.g./ 20 = version 20, 21 = version 21, etc.).

When the wash program buttons are released, the LED's above them will begin flashing. To end the test program or test cycle, press the ON/OFF button.

To check the wash program LED, press its corresponding button.

To check the Cycle Countdown display, Refill Rinse Agent LED and REGULAR WASH button LED, press the REGULAR WASH button (press the DELAY START button to test the

Cycle Countdown display alone).

The Cycle Countdown display should show "88" when the DELAY START button is pressed and "8h" when the REGULAR WASH button is pressed.

To start the test cycle, press both the SCRUB WASH and DELICATE/ECONO buttons a second time.

When the test cycle has completed, the Cycle Countdown display will indicate a fault using the codes below. If a combination of faults exists, the code numbers will be added together, (e.g./ 6 = faults 2 + 4).

0 = No faults

1 = Aqua Sensor ("Sensotronic") fault

2 = Heating fault

4 = Filling fault
8 = NTC (temperature sensor) fault

email me at [email protected] and I can send you via a "pdf" of the diagnostic/repair manual for your specific Bosch...provided it is indeed a SHU5316 unit.

I`ll watch for your reply. Good luck.

Regards,

Macmarkus :)

Hello Vorlon,

Have you checked the current draw while in the test mode ? You'll need a "clamp on meter" ( a meter with a current coil ) It should draw about 11amps with normal heating.

The fact that the only cycle you've indicated finishes is "rinse & hold" only further validates a faulty control or heater, NTC, or flow switch. If it where just a aqua-sensor, it would have no effect on the cycles completing.

Actually It is not likely you would see any noticeable effect from just a faulty aqua-sensor, all it does is measure the amount of soil/dirt in the water and if it is faulty the cycle may be extended, but only slightly.

However if the heater relay in the control is bad, the heater itself, NTC ( negative temperature co-efficient hi-limit) or flow switch are defective, you will only get a current draw of around 105-2amps.

I have a more extensive service manual you are free to have if you think it may help you understand what I'm saying. You'll just need to provide your email address.

I'm in the process of setting up a link for folks like yourself who can make use of this technical info, but I'm not quite there yet...multi-media and pc's in general are not my forte !

I'll watch for your reply.

P.S.

FYI, you could've posted a reply on your last post and I would've received an email directly from "fixya' letting me know you had replied, I hadn't known until I was on here looking that you'd posted a "new' post.

anyway, good luck.

macmarkus :)

Hello, welcome to Fixya. Actually an error code "1" refers ONLY to a heating error. I'm not sure what you've based your info on, but "1" being displayed has nothibg to do with a water fill/level issue what-so-ever with any Bosch dishwashers. Here's how to perform a test or diagnostic for the "shu43" series Bosch to determine once and for all the problem you're having though. Make sure the power button is in the off position ( open & closing of the door will activate the "auto shut off" ). Once certain it is "off" press and hold both the regular button and rinse & hold button, then turn the unit "on" while continuing to depress those 2 buttons. Initially, control module version # will display ( i.e. "20" = version "0" without jumper...not important for this ). When the buttons are now released, the lights above them will flash. To start testing, press both the "regular wash" and "rinse & hold" a second time. Let the test follow through. When testing has ended, the display will show an error using codes as follows. "0" = no error. "1" = aqua sensor fault. "2" = heating fault. "4" = filling fault. and finally, "8" = NTC ( temperature sensor ) fault. If it where related to a fill/level error you would see the letter "F" during washing but the # 4 in diagnostic's. Similarly for a heating fault, the diagnostic will identify a #2 but the "1" appears during normal washing. Let me know if I can assist you further. Hope you found this helpful and if so please allow for a positive rating. If there is anything not clear let me know and I'll try to expand on the info I posted. Good luck. Macmarkus :)

change the control module. im a old bosch tech. send me a 4thumbs post if this was helpful

Do you have high temp rinse or sanitize selected? This will pause the timer during the final rinse cycle to heat the water. The sensor might be bad. Try the quick cycle, I don't think this heats the water.

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At pumping out during rinse cycle level does not fall below level 1
Drain pump faulty, blocked, aqua stop not closing completely, no signal from circuit board (connection number 6 on XA1 connection plug)

you have to replaced the main control resoldering wont fix it because the relay itself has gone bad replacing the board will solve the problem