The answer to 'my water heater keeps shutting off' is that there are several common causes, including a faulty thermostat, sediment buildup, or a problem with the heating element. The symptoms may include the water heater turning off unexpectedly, the water not getting hot enough, or the unit cycling on and off frequently.
In many cases, the solution can be as simple as adjusting the thermostat or flushing out the tank to remove sediment. However, if the issue is with the heating element or other internal components, it's best to call in a professional HVAC technician to diagnose and repair the problem. Attempting to fix these more complex issues yourself can be dangerous and may even void the warranty on your water heater.