The LC code indicates that the tank is too large and therefore needs to be washed. You can hire a company to run the service, which costs around 100, 150, or you can empty it yourself, but you’ll need a few things.
With the water heater connected to MC91 or MCC91, you can easily find the latest error codes. Press and hold the ON / OFF button for two seconds and press the UP arrow, the last nine Rinnai error codes will be displayed and flash in sequence.
Error code 11 Rinnai means that the hot water system does not turn on or is not receiving gas. You can try the following to fix the problem: Check the hot water system for any visible damage or loose parts. Find your gas supply and make sure it’s on.
If hot water is needed by opening the shower, washing machine, dishwasher or tap, cold water flows from the inlet hose on the underside of the water heater into the Rinnai instant water heater. The flame ignites and heats the two heat exchangers of the Super High Efficiency models.
Reset Rinnai LC Fault Code After Flushing The controller continues to beep. For older products, you can reset the LC code by turning the device off and on again. With the latest products, a shutdown function is built into the product to prevent damage caused by deposits on the water heater.
Troubleshooting Error Code 12 Rinnai Error code 12 indicates that the Rinnai hot water system has a flame failure or low gas flow. Check if the gas on the gas meter or gas cylinder is on. Check that the gas in the boiler is on. Make sure there are no obstacles in front of the fireplace.
Check that the tank is producing no water flow by using the temperature control by holding the UP button for 3 seconds, then the ON / OFF button. The number shown is your direct debit. (i.e. 7 = 0.7 gpm, 25 = 2.5 gpm).
If you try to turn the water heater on or off without water, Rinnai recommends plugging in the water heater instead of using the module’s reset function. If you need to use the module’s reset function, insert a small pin into the reset slot (see below).
The suggested retail price for our water heaters is generally between 900 and 1955, depending on the model. These prices do not include installation or ventilation. Please contact a local Rinnai dealer for a more accurate price.
Faster hot water thanks to recycling No more waiting for hot water. With its own return line, the integrated pump simply feeds water from the tank without a boiler through the line and returns it to the heater. If your home doesn’t have a dedicated return line, which many don’t, adding a line can be very expensive.
Instantaneous water heaters produce an infinite amount of hot water, take up less space, have a lower risk of leaks, are safer and, on average, have a much longer lifespan. The main disadvantage of instantaneous water heaters is that the initial cost (unit and installation) is significantly higher than that of instantaneous water heaters.
 Rinnai limited warranty for a heat exchanger used in a circulation system controlled by a thermostat / thermostat or timer, or a 12 year warranty for residential applications and 5 years for commercial applications.