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Repair and disassembly guides and support for dish washing appliances.

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Water pooling in BOSCH Dishwasher SMV45EX00E/24

I'd like to ask your help regarding a fairly strange issue I have with a BOSCH SMV45EX00E/24 dishwasher: the washing cycle is working just fine, water comes in, cleans the dishes, used water is pumped out, and at the end of the cycle there is no water inside, but after a few hours, fresh / clean water keeps slowly filling in the bottom and the only way I can temporarily fix it is to turn the off  the water. (One time it even overflown and caused the device to give error E15, I've eliminated water under the Styrofoam safety switch so that the error clears but that made me think there is something causing this).
After searching on the internet I've concluded that the water inlet valve needs to be replaced, which I just did, ordering an original piece, mounting it, but there is no change in the overall behavior, water is still slowly pouring in after a couple of hours, just like before.
Do you have any ideas which part should be checked next? I'm thinking of the water flow sensor.
Apart of that there is no other issue with the machine. (except it's not even three years old and behaving like this).
Any input is appreciated,
Thanks in advance,

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Check Valve

The check valve prevents water from returning to the dishwasher after it has drained. If the valve gets stuck closed, it will prevent the water from draining. If the check valve is stuck closed, try cleaning it out and then replace it if necessary.

Check Ball

The check ball is a small plastic ball in the check valve that prevents water from returning to the dishwasher after the dishwasher has drained. If the check ball gets stuck, it will prevent water from draining through the check valve. If the check ball is stuck, try to free it.

This can also be caused by low water pressure.

UPDATE 10/4/22 @defy81

OK, a heat exchanger on a dishwasher is new to me, maybe you too. Here's a video on how it works:

So looks like the issue is emanating from it. This could be condensation from when it refills with cold water. Could be the valve or gasket that allows the water in. Check to see when the water is entering and stick your finger in it to see if it is warm or cold. Try to determine when it starts leaking and that may give us a clue.

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Hello Mayer, first, sorry for a typo, I had error E15 not E14, article has been corrected.

As for the valve itself, I have changed it allready with a brand new original piece, in the hope that it'll stop ths slow water accumulation but it didn't solve the issue.

Today I took a closer look and saw the water dripping from a cap located on the left side inside the machine. (Please find it here, Bosch part number 00623541).

I've unscrewed it but apart for some small debris, which I've cleaned in the sink, I cannot see anything wrong with it, screwed it back and observed as the water is dripping from the holes inside it.

Where can that water be coming from? The heat exchanger? (I assume it's the white plastic component that sits on the other side of the machine's wall. Have marked with green the path of the water dripping inaide the washer).



Block Image

Block Image

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I can't see the O ring gasket, is it there? An E15 error code indicates that the safety switch has detected water in the base of the dishwasher. Your leakage protection system has activated. Bosch states "Please turn off the water inflow and contact Bosch Customer Support at 1-800-944-2904 for assistance."


There was no o ring gasket under the cap, found it strange, however the water seems to be dripping from inside the cap, ebtween theash like structure, where the gasket wouldn't make any difference.

I've cleared error E15 by removing the water with a sponge from underneath the machine, where the excess water (that is dripping from inside) had triggered the safety switch.


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Odd that the new valve did not fix it as that is usually the case.

I would not look "down stream" because water would have to be passing the valve in order to leak from something else.

Valve-wise, it could be that the valve is funky out of the box, or there is improper control voltage hitting the valve. This has to be a timed control test: remove the hose OUT of the valve and put a towel or cardboard under the valve. Set a timer for 15-30 minutes and check for leakage. Keep doing until you can confirm leakage from the valve. If it is within your skill set, remove the control plug and check for ZERO volts DC or AC. If there is any voltage present then that could be partially opening the valve and you have to look back to the control board, or specifically the control component on the board, again, only if within your skill set, supplying the valve OPEN voltage.

Another issue could be high house water pressure. Check your home water pressure, which should be 40-60 psi. When I first moved in, it was over 90 and although it made for a great shower I was replacing toilet valves more often than I should have been. Municipal water lowered the system pressure over the years while I hesitated putting a regulator on the water main and all is normal now.

Good luck!

PS: folks, buy the extended 5 year warranty on anything electronic AND buy a surge suppressor. They have both paid for themselves with "free" replacement dehumidifiers, TV's, phones, etc. and blown suppressors. I have both a whole house suppressor and individuals (or surge/UPS) on electronics. I am a 30+ year electronic technician and it took me 20 years to fully realize those $$ saving practices!

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