I have not had hot water in one of my bathrooms or my kitchen sink since I paid to have someone install a new hot water heater. The only room that has hot water is a bathroom on the opposite side of the house. I haven't had the money to fix it so it has been like this for awhile now. I am trying to fix it but not having any luck.

I just had all the hot water lines under the house changed this past weekend, but it still did not fix the problem. It was galvanized pipes and they changed them to PVC. However, the kitchen sink and the bathroom tub / sink still has not hot water.

Anyone has any suggestions?
I really don't want to have to tear my walls down, but it seems that is the only other option. It seems that there is something obstructing inside the pipes from the mainline to the faucets. I changed all the faucet fixtures this past weekend, but it made no difference.

I did check the valve under the kitchen and bathroom sinks - they are completely open - but no water coming through it.

Most likely there was beris that broke loose when the water heater was switched. If you know how to open your mixing valve do it and clean the hot inlet. If you are sure how to do this just let us know and we can help further. A picture or brand/model of the valve would be helpful at that point.