The answer to 'shower no hot water' is that there could be several common causes, such as a faulty water heater, a broken thermostat, or a problem with the shower valve. Symptoms may include lukewarm or cold water coming from the shower, and the issue may be isolated to the shower or affect the entire home's hot water supply.
Some possible solutions include checking the water heater's temperature setting, inspecting the shower valve for any blockages or issues, and ensuring the water heater is functioning properly. If the problem persists or you're unsure of the cause, it's best to call a professional plumber to diagnose and resolve the issue.