Noritz NR98 & NR111 error codes
The widest model list on this site, and the one where the model number matters most. **NC199 with one C is here; NCC199 with two is a different series with a different table**, and Noritz prints them on facing pages of the same manual. Two codes on this table belong to the commercial ASME models alone — Noritz marks 21 and 56 "For NC380-SV-ASME / N-1321M-ASME only", so if you have an NR98 or an NR111 they are not yours and should not be on your list at all. This range has no condensate neutralizer and therefore none of the neutralizer codes its NCC199 sibling carries, and it adds a flow sensor code, 41, that the sibling does not have. Codes appear with an "F" in front when they come from the secondary unit of a quick-connect multi-system.
Not your models? Check the model-number decoder before you read the table below — the code numbers repeat across series and the meanings do not.
| Code | Error | Verdict |
|---|---|---|
| 10 | Combustion fault, BTU drop | Call a pro |
| 11 | Ignition failure | Call a pro |
| 12 | Flame rod does not detect flame | Call a pro |
| 14 | Thermal fuse triggered | Call a pro |
| 16 | Abnormally high output temperature | Call a pro |
| 20 | High limit switch triggered | Call a pro |
| 21 | Pressure switch triggered | Call a pro |
| 30 | Air inlet thermistor fault | Part replacement |
| 31 | Inlet thermistor fault | Part replacement |
| 32 | Outlet thermistor fault | Part replacement |
| 33 | Heat exchanger thermistor fault | Part replacement |
| 41 | Flow sensor fault | Part replacement |
| 56 | Multi-system CCP valve fault | Part replacement |
| 59 | Heat exchanger flow fault | DIY fix |
| 61 | Fan motor fault | Call a pro |
| 65 | Main flow control valve fault | Part replacement |
| 66 | Bypass flow control valve fault | Part replacement |
| 70 | Circuit board fault | Part replacement |
| 71 | Gas solenoid valve drive circuit fault | Call a pro |
| 72 | Flame rod circuit fault | Call a pro |
| 73 | Circuit board setting fault | Call a pro |
| 90 | Combustion fault | Call a pro |
| 99 | Combustion fault, unit shuts off | Call a pro |
| 760 | Remote controller communication fault | Part replacement |
| F76 | Multi-system communication error | Part replacement |
Every entry above is transcribed from the manufacturer's diagnostic documentation for this exact series, with the source cited on each code page.
Other Noritz series
Different series, different code table — if your unit isn't a NR98 & NR111, check yours: