The answer to 'drain trap no hot water' is that a lack of hot water in the drain trap is often caused by a problem with the home's water heater or the plumbing connecting the water heater to the drain trap. This can happen if the water heater is not functioning properly, if there is a blockage or leak in the pipes, or if the water heater is set to a low temperature.
Some common symptoms include the drain trap not filling with hot water, the water in the trap being cold, or the water taking a long time to heat up. Solutions may involve adjusting the water heater temperature, unclogging any blockages, or repairing any leaks in the plumbing. If you're not comfortable troubleshooting the issue yourself, it's best to call a professional plumber to diagnose and fix the problem.