If your water heater starts making strange noises, the first thing you should do is call a professional to inspect it. There could be a number of reasons why your water heater is making strange noises, and many of them require professional assistance to fix.Some of the most common reasons for a water heater making strange noises are a build-up of sediment in the tank, a leak in the tank or piping, or corrosion. If your water heater is making strange noises, it's important to have it inspected as soon as possible to avoid any further damage.