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PostPosted: Mon Aug 16, 2010 3:26 pm 
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We have just changed our washer for a washer dryer and I noticed after the old washer had been disconnected (before the new one was connected up), when we turned the cold tap off there was quite a loud knocking noise coming from the pipes.

This was more noticable with the upstairs tap but did also happen with the downstairs one but it was only ever the cold.

I assumed it was due to the change in the water pressure because of the removal of the appliance and sure enough when I connected up the new washer dryer it seems to have got much better. There is still a slight knocking but that may have been there before.

However, now I have noticed that the tap water tastes quite strange and a little unpleasant. It is hard for me to put my finger on exactly what the taste is, almost seems a little sweet.

I am guessing if the pipes were banging that it may have just disturbed some sediment or something and that just needs some time to flush out of the system but what do you think? Is it anything to worry about?

PS: Not sure if it matters but the old washer had both hot and cold inlets whereas the new one only has cold. Also we did hear some strange banging the night the taps started making noise. It was constant and lasted maybe 30 second to a minute. We did not know what it was at the time as we couldnt trace the source, I actually thought it was maybe from the pub a few doors down but now I am wondering if it was the pipes.


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PostPosted: Mon Aug 16, 2010 3:40 pm 
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Could be the jumper in the stopcock has come loose when you turned the water back on, or it could have been air in the pipes, when you disconnected the old washer.

Bad taste is not good, the water supplier should be able to do a test.

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PostPosted: Mon Aug 16, 2010 3:43 pm 
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i assume you have just blanked off the hot supply and not connected them both together to feed the machine through the one inlet!!

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PostPosted: Mon Aug 16, 2010 3:49 pm 
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Clip any loose pipes too

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PostPosted: Mon Aug 16, 2010 3:52 pm 
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thescruff wrote:
Could be the jumper in the stopcock has come loose when you turned the water back on, or it could have been air in the pipes, when you disconnected the old washer.

Bad taste is not good, the water supplier should be able to do a test.


Thanks - is there an easy way to check the jumper in the stopcock?

Yes I figured I may have to get the water company down to check it out. Will see how it goes over the next couple of days and if it gets no better Ill give them a call....we will stick to bottled water until then!

Big-All - Yes I blanked off the hot water supply, the washer dryer only gets fed off the cold supply :wink:

By the way, the water taste is what concerns me most at the moment, the pipes knocking isnt too bad now main reason for posting was the taste of the water!


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PostPosted: Mon Aug 16, 2010 3:59 pm 
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Not really unless you put a listening stick on the stopcock when it's making a noise.

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PostPosted: Mon Aug 16, 2010 4:11 pm 
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Ok thanks Scruff

Regarding the water taste, just found out from another forum that often with new washing machines or dishwahers the materials used in the connecting pipes can sometimes react with the chlorine in the water which gives the unpleasant taste.

It seems the way to fix this is to fit non-return valves/check valves (are they the same thing?) to the supply.

I guess I will leave it a day or two....maybe its just because its new but if it doesnt go away Ill have to look at doing that....not sure how much of an easy job it is - is it just a screw on job or does it involve something more complex?


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PostPosted: Mon Aug 16, 2010 4:39 pm 
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There's an interesting theory, did you laugh out loud, because you should have. :lol: :lol:

Rubbish, tripe and poppycock.

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PostPosted: Mon Aug 16, 2010 4:46 pm 
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thescruff wrote:
There's an interesting theory, did you laugh out loud, because you should have. :lol: :lol:

Rubbish, tripe and poppycock.


Really? It seems that is also what several of the water companies are also saying.

Any thoughts on what could be casuing the taste if its not that?


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PostPosted: Mon Aug 16, 2010 4:59 pm 
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Lets assume you're drinking maims raw water.

The washing machine is a dead leg and cannot backflow into the mains to taint the water, it's impossible unless you turn the mains off.

What could have happened is assuming you did some soldering then flux could have gotten into the pipe.

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PostPosted: Mon Aug 16, 2010 5:13 pm 
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thescruff wrote:
Lets assume you're drinking maims raw water.

The washing machine is a dead leg and cannot backflow into the mains to taint the water, it's impossible unless you turn the mains off.

What could have happened is assuming you did some soldering then flux could have gotten into the pipe.



Hmmm ok that leaves me confused then!

I have not done any soldering....just unscrewed the old washer inlet pipes, capped off the hot water pipe and connected the new washer inlet pipe to the cold.


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PostPosted: Mon Aug 16, 2010 5:15 pm 
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Did you turn the mains off for any reason.

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PostPosted: Mon Aug 16, 2010 5:20 pm 
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thescruff wrote:
Did you turn the mains off for any reason.


Yes, when I disconnected the old washer the hot valve was dripping even when turned to the off position. So I turned off the mains whilst I got a new end cap to stop the drip.


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PostPosted: Mon Aug 16, 2010 5:48 pm 
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And are all the taps tainted, have you tried the basin cold for example.

Is another mains cold tap up or down stream of the kitchen tap, do you have an outside tap for example.

If the old rubber stopcock washer has broken up it could cause tainting, and could attribute to the banging as well.

Where does the hot come from a combi or cylinder.

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PostPosted: Mon Aug 16, 2010 6:51 pm 
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Only seems to be the kitchen tap that is effected, the bathroom basin tap tastes fine.

I only had a new stopcock fitted back in March as the old one had seized up so would be surprised if anything had gone so quickly on that.

Hot water is from a cylinder.


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