No Water from Hot Water Line to Washer?

Our washing machine is in our kitchen. Both the cold and hot water pipe hookups run up through the floor to the washing machine. No matter what I have tried as far as cleaning the screen at the hot water valve, as well as, checking the entire line itself from the washing machine to where it goes down into the floor for any clogged or debris have done all that and none of that is the problem.

I know it's not a problem with something clogging the washing machine where it connects to the valve because it's a brand new washing machine. In the 11 years in this house we are on our third washing machine and we've never been able to have hot water run into it. Let me be clear it's not that it just doesn't have hot water come out it doesn't have any water come out of the hot water side. It's obviously closed off somewhere, but I cannot figure out where to look. In the general, the water used in our house for both of our bathroom sinks, the hose pipes outside, and the cold water side of our washing machine all have great water pressure, but not our kitchen sink. The shower has the worst water pressure.

I have changed the hardware on the kitchen sink as as well as changed the shower head and the faucet twice now to no avail. The water pressure is completely horrible and didn't change at all. But honestly as much as I would like the shower pressure to be better I would much rather have hot water in my washing machine because I have four kids who get really dirty and cold water washing doesn't cut it.

This is an old house, it's been added onto and someone flipped it at some point just to make it look better cosmetically to sell, but did sub par work that my 8 year old daughter could have done way better work on this house than this lazy unprofessional, careless, clueless, and clearly not anything close to being a carpenter or contractor. I would go as far as to say he probably has issues building Lego sets! I'm sure this has something to do with it.

I find it hard to believe that there was a hot water pipe and hookup created alongside the cold water one and brought up through the floor for that washing machine area just for looks. It had to be used at some point, but someone came along and completely screwed with it and if I could afford a plumber trust me I would.

So any help with any of these issues would make me so happy if I could find fixes for these. Just an fYI example of what a crappy job the idiot that flipped the house did to this house, in one room that he added on that's about 8 by 10 he literally only put one electrical outlet for the entire room and if that's not bad enough I guess he thought one outlet for this room is good enough it surely doesn't need any sort of ceiling lighting. Derrrrrrrr....arch! Anyone care to explain that, lol?