Introduction Spotting a water heater issue is not a big deal. When you go for a nice warm bath and get wrecked by a cold shower of water, you know that your water heater is not working. There can be several reasons why a water heater may not function. Let's discuss some. Causes The causes for a water heater not functioning properly can be either due to scale formation on the heating elements, or mineral or sediment deposits. Sometimes it can just be that you've accidentally lowered the temperature by turning the thermostat. Whenever weird noises coming from your water heater, it can be due to sediment deposits. When they get heated up, they break and make noises. Scale formation happens because the water always carries minerals. When they get heated up, some minerals tend to form scales. These scales don't let the water get heated up properly by demeaning the function of the heating coil. Do's In case, you've accidentally turned off the thermost...