Dishwasher – AquaStop not allowing enough water in.

[Mark Flint]

I am working on a Beko DIN28Q20 which has a water fill problem. I could hear water coming into the machine but fails to fill and stops with an error code E02 (water fill issue). I tried a new AquaStop (non OEM) and hooked up one end to the cold feed, the other end into a bucket while I had the electrical connector plugged into the dishwasher and started a program. When the control board gave the instruction to fill the machine the solenoid opened the valve but I only got 2.25 litres per minute of water. The cold feed through a standard hose is lively and fills 2 litres in about 10 seconds, indicating a water pressure of about 3 bar. Could this amount of pressure cause this error?

I was under the impression that the solenoid was either open or closed. Could it be not opening fully if there is insufficient electrical power getting to the solenoid coil?

[electrofix]

was the old water hose faulty ?

have you checked the water counter as these fail and machine gives same fault code 1760940100

Dave

[Mark Flint]

electrofix wrote: was the old water hose faulty ?

have you checked the water counter as these fail and machine gives same fault code 1760940100

Dave

Thanks Dave.

I don’t remember what the electrical resistance was on the old solenoid hose but I did a flow rate check. The flow rate through the old hose (into a bucket) was down to 2.25 litres per minute (solenoid was powered from the dishwasher). As the output into the bucket gives a true indication unaffected by any sensors in the machine it seemed like a no brainer to replace the hose. But the new replacement hose didn’t prevent the E02 error from stopping the program at the fill stage. I just got a cheaper replacement “aquastop” non-OEM hose. By the way, where did you get fault code 1760940100 from?

Regarding the water counter (picture attached) I think I just checked for continuity and TBH can’t remember the result but it gave me the impression it was OK. I guess it’s cheap enough to replace it and eliminate it as a possibility.

My thinking is that the problem could be…
1) the hose AND the water counter were both broken, and replacing the hose alone did not solve it.
2) the replacement non-OEM hose is as original spec
3) the volts/amps to the hose solenoid are insufficient due to unwanted resistance somewhere

Could I have missed something?
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[Mark Flint]

I wanted to edit my reply to include a bigger picture, but can’t seem to edit my own posts

[electrofix]

the number is a part number of the flow counter

google search it

the fact the old unit had a reasonable water flow would mean its probably not the fault

Dave

[Mark Flint]

electrofix wrote:the number is a part number of the flow counter

the fact the old unit had a reasonable water flow would mean its probably not the fault

Dave

Dave, here’s a quick video. The hose is not going into the dishwasher and is only flowing at 2.25 litres per minute. The dishwasher specs say it needs 10 litres per minute. I get an E02 (water fill) error whether the hose is connected to the water matrix or just going to a bucket. https://youtu.be/8CcAJEB32XA

Mark

[electrofix]

you will get the error code if the hose is not connected to the marix even if you have 5000 litres a minute coming out

the switch measures the water flow in litres per minute to determine fill level

where are you getting 10 litres a minute from as all the user manual says is water pressure from 0.3 to 10 Bar

Dave

[Kentish]

I have never known a dishwasher allow full flow of water, they always restrict it. Well that’s the ones I have seen in 42 yrs anyway.

[electrofix]

Kentish wrote:I have never known a dishwasher allow full flow of water, they always restrict it. Well that’s the ones I have seen in 42 yrs anyway.

Agreed

Dave

[Mark Flint]

electrofix wrote:

where are you getting 10 litres a minute from as all the user manual says is water pressure from 0.3 to 10 Bar

I must have read it somewhere else – 10 litres per minute – for example here: https://www.bosch-home.com/qa/en/service/get-support/26_support_selfhelp_dishwashers_repair_problems_water_tab_error_in_display

I thought that was the rate water should flow through the inlet hose. As Kentish says in his comment – this is not usually (or ever) the case. So the 2.25 litres per minute I measured through the aquastop hose is probably normal. That’s great – I can eliminate the hose from the equation!

So it most likely is the reed switch counter Dave.

Cheers! Mark

[Mark Flint]

Kentish wrote:I have never known a dishwasher allow full flow of water, they always restrict it. Well that’s the ones I have seen in 42 yrs anyway.

I didn’t know this. Thank you!

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