There was always another option.

.

.

Sewage backup.  And, at least in part, that is the case.  I didn't install the inlet hoses.  And, this morning, there was a lot more water on the floor.  So.  Okay.  Now, I did get a better look at the back.  And, yes, it was dripping, definitely, from the cold water inlet.  Definitely.  But that, obviously, isn't all of it.  Today it was none of it.

Wow.  There are so many things that could be the problem.  I have finally started sorting through a few of the easier fixes.  Potential fixes.  Potential OTHER fixes.  As replacing the cold water fill hose will solve one of the problems.

I am sure there is some backup.  Last winter, the plumber had set my tub faucet to drip, so it didn't ice up, and back up for that.  It went very well, last year.  But... the drip he crated became more serious, a flow.  And there was no way to fix it.  But, finally, that too was fixed.  But, now, without a drip, I think the drain pipe is icing up again.

However, I am thinking, perhaps, to let the faucet just drip, by cracking the faucet just enough for a very light, occasional, droplet to go.  Somewhere, my drain line is too close to the cold.  And, we just went through a cold snap, a hard one.  It's up to 20 F, tonight, and got even to 28 earlier today.  Even so, I think that is the (current) problem.  Usually it doesn't get to the washing machine, but... who knows why that is doing as it is.  Bleh.

Though, here are a few other options.  Will see.  Oh, and there are smaller line inserts for in house drain pipes, even one for sink drains, and other smaller problem areas.  I have them in my basket, but will be looking at H.D., to see if I can get one before (at least) January 4th... though give or take a week given the season and amazon's current problems.  I definitely want this fixed before then.

Never can be sure what the problem is, on first contact with problems.  But... especially with some history... can begin making more and more educated guesses, as the problem solving continues.  Bleh.  I think I have a blow out valve, in the house, though using it makes me a bit nervous.  Nothing a towel and forty five pound weight plate wouldn't fix.  Probably...  Or several.  One towel wrapped weight over each outlet downstream, and towels around the toilet... maybe with a block in the outlet of the toilet, too.  A plunger, duct taped well?  Something.

Still, it's... a start.  Always something, if you don't ever really know what it might be.  Even when fixed, certainty of causation can be a rarified gift.  Bleh.  later.