The answer to 'pipe repair not working' is that there are several common causes, including incorrect repair techniques, underlying plumbing issues, or the wrong type of pipe repair materials used. Symptoms may include continued leaks, reduced water flow, or further damage to the pipes.
Some common solutions include re-doing the pipe repair using the proper techniques and materials, addressing any underlying plumbing problems, or in some cases, replacing the damaged section of pipe entirely. In many cases, it's best to call a professional plumber, especially for more complex repairs or if the initial DIY attempt was unsuccessful.