The answer to 'water line replacement not working' is that there are several common causes, including improper installation, frozen pipes, or a leak in the new line. Symptoms may include low water pressure, leaks, or the water not turning on at all. Solutions can range from simple DIY fixes to calling a professional plumber, depending on the severity of the issue.
If the water line replacement was a DIY project, the most likely cause is an improper installation. This could mean the pipes weren't connected properly, there are leaks at the joints, or the line was damaged during installation. Frozen pipes can also cause issues, especially in colder climates, where the new line may not have been insulated properly. And even a small leak in the new line can quickly lead to bigger problems.