The Dishwasher Mystery

As I mentioned last time, while we were on vacation in Florida our cat sitter wrote that our dishwasher was leaking. Specifically, the bottom of the machine was filled with water and was leaking onto the floor. This was right after the first of two big storms that hit home while we were away, so of course I worried that something had gone wrong with the dishwasher (bad), with the water supply to it (bad), or with the backflow valve on our house’s line to the sewer (worse). Still, despite my worrying about the worst case, apparently it was just water on the floor, and not any of the other wonderful stuff you would expect if you had a sewer back flow.

Our sitter, wonderful person that she is, brought over some super-absorbent pads to put under the front of the washer, and also turned off the hot water to the washer and to the sink, just to be safe.

For the rest of our trip, now news was good news; despite another storm hitting the house, we heard nothing more about the problem from her. That seemed like further evidence that it wasn’t a sewer backflow problem. We have not been thrilled with our dishwasher (a General Electric model which came with the house) as it doesn’t do a wonderful job of cleaning dishes, and we’ll probably replace it before too long. (Of the appliances our builder installed, it’s the only one we haven’t been happy with.)

So, we got back last Monday night and inspected the washer before going to bed: It was clean and dry. The next day I turned the water back on, and we kept an eye on it for the rest of the week, and nothing happened. So we planned to run the washer this weekend when it was reasonably full.

Late this afternoon Debbi noticed that the washer was filled with water on the bottom, and on the edge of leaking out. Very mysterious, since we hadn’t had any rain at all! My theory at this point was that there was some blockage in the side of the sink that the washer drained to and when we ran the water on that side of the sink it was draining to the washer instead. But I couldn’t see anything in the drain. So, after a short debate we decided to run the dishwasher as planned.

Two things happened: First, the dishwasher immediately started venting water into the sink drain as expected. Second, two of the front lights were flashing as it did so, which is not normal operation. Debbi checked the user’s manual, but didn’t find out what it meant. So I decided to stop the washer, wait a moment, and then start it again. This time it started normally, no flashing lights, ran to completion, and did not leak.

So my best guess is that the washer somehow got into some weird state while we were away, so that the drain from the washer to the sink was open, and thus the sink was partly draining into the washer rather than vice-versa. Maybe we bumped something before we left, somehow. Maybe our sitter was making sure everything was working and somehow triggered something with the washer by accident. Who knows.

But as of now, anyway, it seems to have been a transient fault which has been fixed.

Which is good, because I hate dealing with plumbing problems.

One thought on “The Dishwasher Mystery”

  1. Here ara a couple of easy things to check, based on my own history of dishwasher problems over the years:

    1. Make sure the screens or filters are clean on the dishwasher – these are usually on the bottom of the tub. A surprisingly-large percentage of folks never clean them out.

    2. Check the vacuum breaker (that weird thing on the sink). They can clog and cause draining problems.

    3. Check that the float on the floor of the washer tub moves up and down freely.

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