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The Daily Insight

How do I fix error code 11 on Rinnai?

Author

Sophia Hammond

Updated on May 07, 2026

How do I fix error code 11 on Rinnai?

Rinnai fault code 11 – No ignition. Check to make sure the gas is turned on at the water heater, gas meter or tank. Ensure the igniter is operational. If gas is being supplied to the tankless water heater and the igniter is working, call for an evaluation by a qualified plumber.

What is code 11 on a tankless water heater?

Noritz Error Code 11 This indicates ignition failure in your tankless water heater. It means that your unit is not firing up to heat the water, a situation that can be caused by insufficient gas supply, insufficient airflow or debris on the ignition plug.

How do you clear a Rinnai code?

After flushing water heater, the procedure to reset LC codes: Push the two switches (A and B) on PC Board at the same time for five seconds. Water heater will return to normal operation and LC# count returns to 0. This hard reset procedure is not in owners/installation manual or tech sheet.

How do I reset my Rinnai tankless?

Turn off all hot water faucets/taps. Press On/Off button twice. Turn hot water back on and test. You may have to try this a couple times to reset the system.

Why does my Rinnai gas heater keep turning off?

The main reasons that a gas water heater automatically shuts off are because the pilot light goes out, the pilot light can’t start, or there are problems with the gas supply. If your gas water heater keeps shutting off, the thermocouple could be dirty, bent or damaged.

How long do tankless water heaters last?

20 years
Most tankless water heaters have a life expectancy of more than 20 years. They also have easily replaceable parts that may extend their life by many more years. In contrast, storage water heaters last 10–15 years.

Where is the reset button on a tankless water heater?

The red button on the water heater is where the reset button is located. There are two buttons for each thermostat in some water heaters. The metal plate that holds the thermostat in place may have to be removed to access the reset button.

What maintenance is required on a tankless water heater?

During a regular maintenance visit, a professional will descale, also called delime, your tankless water heater to make sure there’s no buildup around the heating elements. A professional should descale your water heater at least once a year.

How do I fix my Rinnai Code 12?

Rinnai Error Code 12 Troubleshooting

  1. Check gas is turned on at the gas metre or cylinder.
  2. Check gas is turned on at the water heater.
  3. Check there are no obstructions to the flue outlet.