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Discuss Water backing up in dishwasher in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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7
Earlier this year we changed our dishwasher. During the days after the old one had been taken out and before the new one was installed, the loose water pipe was dripping so I put a bucket under it which I emptied each day. The new dishwasher runs fine, but about a day after running it water starts collecting in the unit in the photo and over the next day or two it rises and a pool of water starts building up in the dishwasher's base. I also notice that when the dishwasher starts running, water sometimes starts coming out of the adjacent kitchen sink plughole.

I had a plumber in the house today for a different job and asked him what it might be. He was not sure what might be causing the problem, but suggested having a separate trap not connected to the sink . He suggested getting a dishwasher engineer to look at it, but I am convinced (based on no specialist knowledge at all!) that it is a plumbing issue and not a dishwasher fault.

Can someone please advise me on this? Thanks.
 

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So if the plumber pulls out the dishwasher should he be able to trace and fix it? And is a separate trap/outlet for the dishwasher, separate from the sink, a good idea?
 
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Does the kitchen sink, when full of water, and you pull the plug out to empty it, does it drain away nice and fast or sluggish? If sluggish then maybe the drain pipework needs dismantling and cleaning out.
 
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It drains pretty well.

So where are we with this please? What else might cause water to back up into the dishwasher other than a blockage? Creating a separate outlet for the dishwasher would, I think, mean bashing a hole into the outside wal (which it is sat against) and that sounds quite a big job as an experimental solution.

Should a competent plumber be able to diagnose the fault? I was surprised he suggested getting a dishwasher expert down without looking at potential plumbing problems first.
 
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Sounds like the plumber had something else on his mind. I take it you had no problems with the old dishwasher draining. Perhaps the drain hose from dishwasher is kinked meaning the pump struggles to empty the machine as there's too much back pressure. The other issue of water coming up thro ' the sink is a side issue and maybe not linked to the main problem.
 

king of pipes

Esteemed
Plumber
Gas Engineer
Messages
5,153
From what you've described it sounds like a partial blockage I would get some washing soda put it in your machine in a bowl , and run the hottest program through it to clean everything out before pull everything apart. Kop
 
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That didn't work. I ran it and afterwards poured in a little water to give it a head start and see if the level rose, which it did - there is a pool slowly forming. Next steps please...?
 
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Dismantle all the drain pipes under the sink and clean them. If you get wet, the drain is blocked further along. If they're clear, warranty call for Dishwasher.
 

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