Laundry drain overflowing (only with hot water)

Old 04-05-22, 06:36 AM
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Laundry drain overflowing (only with hot water)

My washer drain pipe started to do something strange. It began overflowing, but this only happens when we run a hot load. We run cold loads and the water drains fine. When it is hot water, the water doesn't go down fast enough and starts to overflow and make a mess. I think it's strange that cold water works fine down the drain, but not hot. I'm no expert though.

Any ideas? I'm assuming I just need to get the drain cleaned out. The house is 50 years old.
Old 04-05-22, 06:55 AM
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Yes, start by clearing the drain and make sure it is working properly.
CasualJoe voted this post useful.
Old 04-05-22, 08:19 AM
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Hi detrog –

I don’t see how water temperature could make any difference. Could it be that your hot loads are larger and so you are using more water? I know on my machine the water usage is determined and varied based on load size. I think your hot/cold comparison would only make sense if the load sizes were the same. At least I think so.

So if you are dumping more water from “hot” loads, that may take you over the threshold and you experience the overflow.

Just a thought.

Old 04-05-22, 09:00 AM
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Yes the first thing I would do is get the drain cleaned.

As to the hot and cold issue the only thing I can think of is that the hot water is heating up the pump vanes making a better seal and therefore pumping out more water.
But this is definitely a shot in the dark!!!
Old 04-05-22, 11:39 AM
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I would think you might need a higher and/or larger id drain pipe, assuming the current one is not blocked.

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