Noritz Tankless Water Heater Error Codes: Complete NR and NRCP Series Guide

Quick Answer

Noritz tankless water heaters display numeric error codes when a fault is detected. Common codes include 11 (no ignition), 12 (flame failure during operation), 14 (thermal fuse blown), 16 (gas pressure fault), 20 (fan motor failure), 29 (heat exchanger high limit), and 90 (combustion abnormality or exhaust recirculation).

NoritzWaterheater

Wrong code?

Not seeing HUB on your display?

Select what your appliance is actually doing and we'll take you to the right guide.

general troubleshooting

TROUBLESHOOTING

condensate drainage issue

heat exchanger overtemp

flame lost during use

gas pressure fault

fan motor failure

error code on display

RESET

no hot water

NO-HOT-WATER

priority light flashing

About These Noritz Waterheater Error Codes

Complete reference for Noritz error codes across NR and NRCP series. Use this guide to identify your code and navigate to the specific repair article.

Most Common Error Codes

No ignition (Code 11)40%

Flame failure during operation (Code 12)24%

Thermal fuse blown from overheating (Code 14)14%

Fan motor failure (Code 20)12%

Gas pressure abnormality (Code 16)10%

Symptoms You May Notice

Error code displayed on controller
No hot water
Unit clicks but does not light
Unit shuts off during use
Flashing error light

Tools Required for Diagnosis

FlashlightScrewdriver set

How to Identify Your Error Code

Note the exact code number shown on the controller display or

Note the exact code number shown on the controller display or error light blink pattern.

Press the power button once to turn the unit off, wait 30

Check that the gas supply valve is fully open and the gas meter

Inspect the air intake and exhaust vent terminations at the

Enter service mode (hold Temp Up + Temp Down for 3 seconds) and

Frequently Asked Questions

Where do Noritz error codes display?

Error codes appear on the wired remote controller (RC-7651M or similar). If no remote is installed, the unit's LED will blink a number of times corresponding to the fault code.

How do I view stored error history on a Noritz?

Hold the Temperature Up and Temperature Down buttons simultaneously for 3 seconds to enter service mode. The display will cycle through stored error codes from most recent to oldest.

Will a Noritz error code clear itself?

Some codes clear after a successful restart if the root cause was temporary (like a brief gas pressure drop). Codes caused by physical failures like a blown thermal fuse (Code 14) will not clear until the component is replaced.

What is the most common Noritz error code?

Code 11 (no ignition) is the most frequently searched Noritz fault. It is usually caused by a dirty flame rod or a gas supply interruption and can often be resolved without professional service.

Is Noritz the same as Rinnai for error codes?

The two brands share a similar numeric code structure. Noritz Code 11 and Rinnai Code 11 both mean no ignition. However, the specific thresholds and repair procedures differ, so always use brand-specific guides.

Related Noritz Waterheater Error Codes

Code: TROUBLESHOOTINGNoritz Tankless Water Heater Troubleshooting: 8 Common Problems and Fixes Code: CONDENSATE-DRAINNoritz Tankless Water Heater Condensate Drain: Blockage Codes and Fixes Code: 11Noritz Code 11: No Ignition Fix for NR and NRCP Series Code: 90Noritz Code 90: Combustion Abnormality or Exhaust Recirculation Code: 14Noritz Code 14: Thermal Fuse Blown - Overheating Fault Code: 29Noritz Code 29: Heat Exchanger High Limit Exceeded Code: 12Noritz Code 12: Flame Failure During Operation Code: 16Noritz Code 16: Abnormal Gas Combustion or Pressure Fault Code: 20Noritz Code 20: Combustion Fan Motor Failure Code: RESETHow to Reset a Noritz Tankless Water Heater and Clear Error Codes Code: NO-HOT-WATERNoritz Tankless Water Heater No Hot Water: 7 Causes and How to Fix Them Code: PRIORITY-LIGHTNoritz Water Heater Priority Light Flashing: What It Means and How to Fix It Code: IGN-FAILURENoritz Water Heater Ignition Failure: Causes When No Error Code is Shown

Same Fix on Other Brands

Rinnai waterheaterRinnai Tankless Water Heater Error Codes Navien waterheaterNavien Tankless Water Heater Error Codes

Models Known to Experience HUB Errors

This repair applies to most Noritz waterheaters with this error code. Common model numbers include:

NRCP199-DV, NRCP111-DV, NR98-DV, NR66-DV, NR711

Last verified for technical accuracy on March 14, 2026