The answer to 'why is my sewer line no hot water' is that the issue is likely not related to the sewer line itself, but rather a problem with the hot water heater or the plumbing system supplying hot water. Common causes can include a malfunctioning water heater, a blockage or leak in the hot water pipes, or a problem with the home's water pressure or water supply.
Some key symptoms to look for include no hot water coming from any faucets or fixtures, lukewarm or inconsistent hot water, or the water heater not heating up properly. Solutions may involve repairing or replacing the water heater, unclogging or fixing leaks in the hot water pipes, or adjusting the water pressure. In many cases, it's best to call a professional plumber to diagnose and fix the issue, as they have the expertise to properly identify and address the root cause.