Noritz NCC199 & NRC111 error codes
Two things to check before reading this table. First, **NCC199 is not NCC199CDV** — the CDV is a later appliance with its own, different code list, and one letter separates them. Second, **NCC199 is not NC199**: one C is this series, two Cs is the NR98 range, and Noritz documents them in two separate tables in the same manual. Both traps are on `/identify-your-series`. What makes this series worth its own page is the **condensate neutralizer**, which nothing else on this site has a code for. Noritz gives it three: 29 when it or its drain is blocked, 92 when its service life is running out, and 93 when that life has ended. It also carries two different high limit switches, which Noritz notes explicitly against code 20. 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 |
| 29 | Neutralizer or water level electrode fault | DIY fix |
| 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 |
| 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 |
| 92 | Neutralizer life cycle warning | DIY fix |
| 93 | Neutralizer life cycle has ended | DIY fix |
| 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 NCC199 & NRC111, check yours: