The answer to 'water heater installation not working' is that there are several common causes, including improper installation, faulty components, or issues with the home's electrical or gas supply. Symptoms may include no hot water, leaks, or the water heater not turning on at all.
Some potential solutions include checking the power source, testing the thermostat and heating elements, and ensuring all connections are secure. However, it's important to note that water heater installation and repair can be dangerous if not done properly, so it's generally best to call a licensed plumber unless you have significant DIY experience.