[stevem066]

Hi Mark,

For speed, I ordered both the Inlet valve/flow sensor Assy and the Pressure sensor at the same time and the parts arrived last Saturday. Prior to fitting the pressure sensor I checked the pipe from the water bottle at the bottom of the drum by blowing down it – the pipe was perfectly clear. After reassembly I ran the ‘Rinse program’ which completed satisfactorily and crucially with no ‘Tap’ warning symbol on the display at any time.

I then repeated the Rinse program and it again worked perfectly. In both cases the water level was about 50mm above the bottom of the drum (no where near the previous half full…….level seen on several occasions) and so was stable and normal. I then ran through the reset procedure though given there were no error messages (E28, E29 as in your case) on our display at any time – even prior to replacing the inlet valve (apart for the Tap symbol, which would come and go) then I suspect this was possibly academic in my case.

Since then we have used the washer in earnest on 3 occasions and all is well to date. This leads me to conclude (like you) that the source of the problem was the inlet valve assembly (Valve magnet- as Bosch call it) and specifically the flow sensor part sending faulty information to the micro computer within the washer.

Out of interest I took a closer look at the flow sensor within the defective valve; the rotating paddle (containing the magnet) appeared to turn freely with no sign of friction and this leads me to suspect the issue could be a result of a defective reed relay switch (on the small PCB) or weak magnet though I have not carried out any testing to be able to prove this.

Given our two identical machines suffered the same fault and after a similar period of time I agree with you that there could well have been a batch problem with some of the valves (used by Bosch) which if so would suggest other people could experience this problem.

Thank you for all your help – it pointed me in the right direction and gave me the confidence to purchase the parts and fix the washer promptly.

stevem066

[stevem066]

Hi Mark,

Thank you for sharing this information – this is extremely helpful. I have ordered both the parts as we need to get the machine up/running asap and because your approach makes much sense. I hadn’t realised the inlet valve included a flow sensor. I also managed to find a minimalistic explanation of the Fault codes E28/E29 applicable to this machine;
[h=2]E28 and E29 Error codes applicable to WAT28460GB/10[/h] [h=2]1. Error E28 / F28: flow sensor faulty[/h]
The fault connected with “Error code E28 / F28: flow sensor faulty” (can’t be rectified by itself). Please contact our customer service and arrange a service appointment. You can reach us on the service number: . Or use our online appointment booking service.

Error code / error display / signal Issue: E29

(i). Check tap

Cause; Water pressure too low. [h=2]Resolution; Check the water pressure directly on the tap using a bucket. Approximately 10 litres of water per minute must flow out of the fully open tap. Contact your fitter if the water pressure is too low.[/h]

[FONT=Times New Roman, serif](ii). Clean inlet filters [/FONT] [h=2]Cause; Filters in the water connection of the supply or AquaStop hose blocked.[/h] [h=2][/h] [h=2]Resolution; Clean filters in the water supply hose. Attention: AquaStop safety device contains an electric valve, do not immerse in water. Instructions: 1. Turn the tap off. 2. Take the hose off the tap. 3. Clean the filters using a small brush. 4. In the case of appliances without an AquaStop, also remove the hose from the back of the appliance. Take out the filter with pliers and clean it. 5. Reconnect the hose and check it for leaks. [/h]
This may be useful for other forum members especially E28, this fits in with your experience totally.

I will provide a further update once I have replaced the part/s and reset the machine etc.

Many thanks again

stevem066

[stevem066]

Hi,
I too have a Bosch Serie 6 washing machine WAT28460GB/10 purchased new in Nov 2015 which appears to have a very similar fault to the one you described; The problem has occurred within the last month and currently shows up with ‘a tap symbol’ on the information display along with 3 warning beeps – it occurs typically during the water fill part of the selected cycle and is most easy to observe using the Rinse only program when the fault has been known to occur up to 3 times in succession within the selected program though it is not predictable, in fact sometimes it will not occur at all. I have checked the water pressure (which is OK) and the two water inlet filters with no signs of restriction due to debri or other deposits.

In my case the fault does not prevent the cycle from completing but simply extends its duration. I have also noticed that the water level will vary and as you say on occasions it will reach almost half way up the drum. At this time I have not changed any parts though I also suspect the pressure sensor. I have also read that the problem can be due to a blockage (or partial blockage) in the pressure chamber or in the thin pipe connecting the pressure chamber to the pressure switch though I am not certain this is the cause at this time. The main difference I am seeing (to date) is the absence of E28/29 error codes. As you say if anyone has any other ideas how to fix this problem I would be most grateful. I will keep you posted from my side.

It does seem potentially significant that the problem has shown up after a similar period of time in both our cases,

Many thanks, Kind regards,

stevem066

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