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How do you fix an e02 error on a water heater?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The e02 error code on a water heater indicates that the water heater has been filled with too much water. This can happen if the water heater is not properly vented or if the water pressure is too high. When this happens, the water heater will shut down and an error code will be displayed.

1. Check the thermostat and make sure it is set to the correct temperature

  1. Open the water heater and check the gauge to ensure it is set to the correct temperature.
  2. If the gauge is not set to the correct temperature, reset the thermostat using the instructions provided by the manufacturer.
  3. Check the thermostat again to ensure that the temperature has been adjusted to the correct level.
  4. If the thermostat is still not set to the correct temperature, contact a professional to fix the water heater.

2. Check the pilot light and make sure it is lit

  1. Remove the cover of the water heater.
  2. Look for the pilot light. If it is not lit, use a lighter to light it.
  3. Replace the cover and reattach the wiring.
  4. Test the water heater by turning it on. If the pilot light does not light, then the water heater is not working and you will need to replace it.

3. Check the gas valve and make sure it is turned on

  1. Check the gas valve to make sure it is turned on. If it is not on, turn it on using the gas knob.
  2. Check to see if the water heater is getting gas. If it is not getting gas, turn on the gas valve outside the house and check to see if the water heater is getting gas.
  3. If the water heater is getting gas, check the water valve to make sure it is open. If it is not open, open it using the handle.
  4. Check the water heater to make sure the water is flowing. If it is not flowing, turn off the gas valve outside the house and turn on the water valve to the water heater.
  5. Check the water heater to make sure the water is flowing. If it is not flowing, turn off the gas valve outside the house and turn on the water valve to the water heater.

4. Check the water heater and make sure there is enough water in it

  1. Turn off all the water valves in the home.
  2. Check the water pressure in all the faucets in the home.
  3. If the water pressure is low, turn on the water to the water heater until the pressure is high.
  4. Check the water heater thermostat and make sure it is set to the proper temperature.
  5. If the water heater is not heating, turn off the water to the water heater and call a professional.

If the answers above didn't work then you should also try:

  1. Check the power supply and make sure the water heater is plugged in.
  2. Call a plumber.