Rinnai error code 79

Rinnai error code 79 indicates a water leak

• The leak can be caused by condensation, a faulty heat exchanger, or other internal leaks. 

How to Solve error code 79?

• Turn off the unit: Shut off both the gas and power supply to the water heater. 

• Inspect for leaks: Remove the front panel and carefully check for any signs of water, especially around the heat exchanger and water lines. 

• Dry the unit: If water is present, thoroughly dry the interior using cloths, a vacuum, or a hairdryer. 

• Check the condensate drain: Ensure the condensate drain line is not clogged. 

• Reset the unit: Try resetting the water heater by turning it off and on or holding the reset button if your model has one. 

• If the error persists after drying and resetting, a faulty sensor or a leak in the heat exchanger may require professional replacement.