The answer to 'water heater installation not working' is that there are several common causes, including improper installation, faulty components, or issues with the power or water supply. Symptoms may include no hot water, leaks, strange noises, or the heater not turning on at all.
Some potential solutions include checking the thermostat, flushing the tank, inspecting the heating element, and ensuring proper electrical and plumbing connections. However, water heater repair is often best left to a professional plumber, especially for complex issues or if you're not comfortable working with electricity and gas.