Some Noritz problems can be fixed by a typical homeowner with a basic set of tools while others will require the services of a licensed professional. If you don’t feel 100% comfortable in attempting to fix the problem yourself, you can simply get a free, no-obligation quote from a local plumber to help you with your decision. Tankless water heater maintenance is different from traditional models so get professional help if you’re not sure.
Have a different tankless water heater brand that needs troubleshooting?
Noritz Tankless Water Heater Error Codes
How to Fix: This is an automatic service reminder letting you know that it's time to call a licensed Noritz technician. Do not reset the error code prior to the service or the water heater may prematurely fail.
How to Fix: Look for foreign materials (ie: oil or grease) on the burner which are still burning after gas combustion stops. To reset the code, turn the unit off and then on.
How to Fix: Check the gas pressure for correct values. Look for any obstructions in the vents as the fresh air supply might be being blocked. Remove any foreign materials from the ignition rod. Confirm there is no loose wiring in the ignition.
How to Fix: Confirm that there is enough airflow for proper gas combustion. Check that the flame rod/sensor is not covered by debris. Clean or replace if necessary.
How to Fix: Replace the thermal fuse. Confirm that the unit has no airflow restrictions and gas has proper combustion. Check water quality as hard water or sediment can cause the heat exchanger to get clogged. Flush the heat exchanger if necessary.
How to Fix: Since this is most often caused by hard water or scale buildup, a descaling procedure should be performed. To reset the code afterwards, unplug the water heater for 20 seconds and plug it back in.
How to Fix: Check high limit switch and replace if necessary. Otherwise, perform the descaling procedure.
How to Fix: Make sure the condensate drain line is properly routed and unobstructed. Confirm condensate piping is the correct size and properly sloped.
How to Fix: Replace inlet thermistor.
How to Fix: Replace outlet thermistor.
How to Fix: Replace the heat exchanger thermistor.
How to Fix: Close the water inlet valve and call for service if you notice a leak. If no visible leak, unplug the unit for 30 seconds to reset it and see if the code clears itself.
How to Fix: Confirm correct gas pressure set and properly set for elevation where it's installed. Make sure enough airflow is getting to the combustion chamber by removing any noticable blockage of the vents. Clean fan motor and burner chamber.
How to Fix: Check voltage coming to the fan motor. Replace fan motor or circuit board if necessary.
How to Fix: Check for blockage and replace main flow control valve if necessary.
How to Fix: Check for blockage and replace bypass flow control valve if necessary.
How to Fix: Turn the unit off then on. If the code reappears, the air gas mixer will likely need to be replaced.
How to Fix: Replace circuit board.
How to Fix: Confirm correct voltage. This error code is often seen when unit is connected to a generator or battery backup or if there is another type of voltage fluctuation. Install a power surge protector if necessary.
How to Fix: Confirm that the water heater is properly grounded. Check for a damaged circuit board, flame detection circuit, or wires, and replace if necessary.
How to Fix: Most likely a jumper connection or dip switch was changed on the circuit board while under power or the circuit board was improperly programmed. Unplug the unit for 30 seconds and plug back in. If the error code still shows up, call a licensed service tech.
How to Fix: Check airflow obstruction and improper gas burning. Confirm correct air/fuel mixture and gas pressure. Once fixed, reset the unit by unplugging for 30 seconds.
How to Fix: Replace neutralizer and reset burner timer.
How to Fix: Check for loose wires and confirm only one remote is connected the the water heater. Unplug the unit for 30 seconds to reset.
How to Fix: Confirm nothing is obstructing the intake or exhaust pipe.
How to Fix: Check for and clear any air blockages and reset unit. If that doesn't work, call a licensed service tech.
How to Fix: Confirm that only one remote control is hooked up when multiple units are connected together. Unplug the unit for 30 seconds and plug back in to reset it.
