I have a Bosch dishwasher that makes a banging noise in the pipes when it takes in water. The noise is coming from a small plastic box that has electrical wires in it, that is between the pipes and the water intake into the dishwasher. The dishwasher has only been making this noise sinc early this year. The dishwasher works perfectly well. It sounds like there might be air in the pipes, but the noise only happens with the dishwasher, and the plastic box with the electrical components in vibrates and bangs when water is taken into the dishwasher. Everything works fine, it's just the noise that is causing us to worry. Any ideas? Is it a big job?We've had a plumber in, and he hasn't a clue. He told us to ask a Bosche technician.Thanks.
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Can you tell me the model number or the ENr from the data plate on the machine please?
Look around the door edge for the plate
Hi Rob. Thanks for your input. I am not at home at the moment, so I will phone and ask my wife for this information and let you know asap. Thanks. Mark
just post back on here and I will see your reply when I am online
Robert Bosch Gmbh
let me check now for you
Does the hose look something like this picture?
I'm not home at the moment, Rob, so I have sent a copy of the picture to my wife at home....hold on, while she logs on and takes a look !!!
She's taking a picture of it and sending it onto me via gmail. I will try to forward it onto you.....
use the green tree symbol above to attach a pcture
sorry, its now below, and no I dont know why they use a tree symbol !!
Thanks, will do...
Can you open this, Rob?
just trying now
Thats what I thought you had, but had to be sure
This is an aquastop valve
It detects if large quantities of water pass through it,
if that happens, as in a burst, ofr faulty DW it will block the water flow
I suspect that this is going faulty, hence the banging noise
How old is the machine please?
Water actually gets into the dishwasher, Rob, and the washer works fine....it just knocks through all the pipes when it takes in water....does this mean we can replace it, or is it repairable? If it needs replacing, how much is a new one and how long does it take to replace? We are selling the house and it doesn't sound good to let our new buyers suffer the knocking.
how old is it please?
We don't know how old it is, as we have been living here three years, and it was here then.
do you think the noise is actually coming from the box itself or the water pipe connected to it?
Good question...when the dishwasher is taking in water, the part of the pipe that takes the water in moves back and forth, and we can feel the knocking in both the pipes and the aquastop valve. We can feel the knocking pulsating through the pipe and the valve, so I'm not sure what is causing it. The noise only happens when the dishwasher is on...nothing else in the house makes the pipes knock.
Its not clear from the picture if the aqua stop valve is firmly attached to the plumbing or the machine.
I would try making sure that the valve can not vibrate at all
same for the copper water pipe
carefully wedge it
If its the valve itself
there is something you can try
if its on its way out, it may stop altogether, so its your choice
To replace the hose is horribly expensive
The part alone is £100 and you would have to get it fitted
My wife has put the washer on. The copper pipe and the valve are both vibrating when it takes water in. What do you mean by 'carefully wedge it'?
try to use some cardboard to stop the pipe from vibrating
so the pipe and valve are firmly wedged
You can also try turning the pressure down slightly on the copper pipe to see if that will help
there should be a turn off valve near where the hose connects and you can turn the lever slightly to slow the flow
Not sure where the cardboard would go, as there is a gap of 4 or 5 inches between the pipe/valve and the back of the unit. My wife has told me it's vibrating through the valve and is causing the pipe to knock. When you say the pipe is £100 for the part, does that include the valve as well? How would we know if that would solve it? Would we have to get a technician out to check it first?
the hose has the valve attached its all in one piece
If you are prepared to pay for a new hose, there is just one thing you can try, but like I said before it may stop working altogether, but you would be no worse off, if you were going to get the hose replaced anyway
Do you want to try that?
OK, Rob, what's our option?
OK, If you are prepared to pay for the hose to be replaced anyway, try this. Where the hose connects to the copper pipe, undo this fitting. Make sure you turn off both the water supply and the electricity to the machine FIRST
A small amount of water will come out of the hose
wait a minute
reconnect the hose and try the machine again
This sometimes resets a valve that is playing up, but it may also stop working altogether
If this doesnt work and it still makes the noise, you will have to call in Bosch who will be able to diagnose it by being on site
I've just passed that message onto my wife....she said that the plumber who called in this morning did exactly that, saw there was an electric cable going through it and then said "this is beyond my capability" and put the valve and pipe back together again. He said we need to get the Bosch technician out to look at it. So it looks like we will have to get the new piping and valve and get the techy to come in....or my wife suggests we just tell the new owners that it is old and that the dishwasher still works ok....
I would just say that it works fine but its just a bit noisy
Thats the truth and you dont really want to pay over £100 for someone else
Good point, Rob. We just wanted to make sure that we covered all the bases and made all the right moves before moving on....we don't like leaving things undone....let's hope the new people understand and they can sort it out when they move in if it annoys them. Thanks, Rob. We are grateful, but realise it may be a lost cause....
Your welcome, good luck with it. Please dont forget to rate my answer well for me
OK, Rob, Will do and thanks....