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Electric Water Heater Repairs This water heater trouble shooting guide assumes that the water heater was properly installed and was operating correctly before  any problems developed. Most electric water heaters have two thermostats, one near the top of the tank and one near the bottom, and are covered by removable metal cover plates. The thermostats are pressed firmly against the bare metal wall of the tank. The top thermostat usually has a high limit  switch that will trip if the water in the water heater gets too hot.  When it  trips it shuts off the electricity to both the upper and lower heating elements.   To reset the high limit switch there is usually a red button that you must  press.  When the upper limit switch trips it is often an indication that something else has gone wrong with the water heater.   Problem: No hot water. First remove the upper thermostat cover plate  and check the high limit switch button.  If it has tripped, press it to reset  it. Check for power at the input terminals of the  upper thermostat. (usually marked L2 and L2)  If no power is present then check  your circuit breakers or wiring to the water heater. If there is no hot water then the upper  thermostat should be applying power to the upper heating element.  Check for voltage at the upper heating element.  If there is power at the heating element  but the element is not getting hot then the heating element needs to be replaced. If there is no power at the upper heating  element then the upper thermostat needs to be replaced. Problem: Not enough hot water or hot water temperature too low. When the water in the top of the tank is hot the upper thermostat removes power from the upper heating element and transfers the  power to the lower thermostat and heating element.  If the lower thermostat is  defective, then the water in the lower portion of the tank will not be heated and the supply of hot water will be greatly reduced.  Check for power at the   upper thermostat terminals where the power is sent to the lower thermostat and heating element.  If there is no power then the upper thermostat should be  replaced.  If there is power then check for power at the lower heating element.   If there is no power at the lower heating element then replace the lower  thermostat.  If there is power to the lower heating element then it should be  getting hot.  If it is not, replace it. Another reason for insufficient hot  water or hot water not being hot enough is a broken dip tube.  Check for a broken dip tube and replace if necessary. Problem: Hot water is too hot. If the water is too hot then a likely cause is one of the thermostats.  Check for power at the top heating element.  If power is present at the top heating element, the top thermostat is defective.  If  power is present at the lower heating element then the lower thermostat is  defective. Another possible cause for the water being too hot is if the thermostats are not pushed firmly against the tank. TP relief valve leaking water. The relief valve will operate if either the  water temperature is to high or if the pressure gets too high.  If the inlet to  the water heater is fed directly from the water main with no pressure relief valves or check valves between them then when the water heater heats the water and it expands, the extra volume of water simply flows back toward the water main.  If however there is a blockage such as a check valve or pressure reducing valve with a defective bypass then the increase in water volume has no where to  go and the pressure with increase dramatically.  Placing an expansion tank in the line at the inlet will give the increased volume of water someplace to go  and prevent operation of the relief valve. Another possibility is that the City water pressure has increased above the setting of the relief valve.  Again the  installation of an expansion tank will solve the problem. Popping or banging noise. Scale can build up on the heating elements causing all sorts of noises to occur while the water heater is heating water.   Try removing the heating elements and either clean or replace them. Stinky hot water. Certain types of bacteria can react with the magnesium anode rod resulting in a rotten egg odor.  Clean the tank using chlorine bleach or changing the anode rod to aluminum usually will solve the  problem. Leaking tank.   Replace the water heater.