Los Angeles Noritz owners see more error codes than homeowners in most other cities — because LA's extremely hard water (200–400 mg/L) accelerates scale buildup in Noritz heat exchangers. Here is a complete guide to every Noritz error code we commonly see, with causes and fixes.
| Code | Meaning | Fix Guide |
|---|---|---|
| Error 11 | No Ignition / Ignition Failure | Fix Guide |
| Error 12 | Flame Failure During Heating Cycle | Fix Guide |
| Error 14 | Thermal Fuse Blown | Fix Guide |
| Error 16 | Overheating — Outlet Temperature Too High | Fix Guide |
| Error 29 | Condensate Neutralizer Maintenance | Fix Guide |
| Error 59 | Scale Buildup Warning | Fix Guide |
| Error 63 | Gas Valve Fault | Fix Guide |
| Error 70 | PCB (Control Board) Fault | Fix Guide |
| Error 90 | Combustion Abnormality | Fix Guide |
| Error 99 | Condensate Drain Blockage | Fix Guide |
Los Angeles tap water has among the highest mineral content in the United States — typically 200–400 mg/L of calcium and magnesium. This hard water deposits scale inside Noritz heat exchangers, causing flow restrictions, overheating, and the error codes listed above.
Annual descaling prevents most Noritz error codes entirely. We recommend all Los Angeles Noritz owners schedule annual maintenance to clear scale before it triggers codes or causes permanent damage.
Learn More About Noritz Service in LAError code on your Noritz? We diagnose and repair all Noritz models throughout LA — service available.
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