Noritz error codes
Noritz makes gas tankless water heaters that show a numeric error code on the display or the remote. Its help center documents each code, and the steps differ between residential and Pro Series premix models. Check the model label on your unit before using any chart.
24 codes across 1 appliance type.
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Noritz tankless water heater codes
06Recirculation flow too low (NRCR)10Combustion warning (can lead to code 90)11Ignition failure12Flame loss14Heat exchanger overheat (thermal fuse)16Outlet water temperature too high20High limit switch tripped29Condensate drain problem37Storage tank thermistor fault (Hybrid Hot mode)45Internal water leak (NRCP and CB models)50Continuous flow leak warning64No flow detected while circulator runs (Hybrid Hot mode)67AGM abnormality71Gas valve drive circuit fault73Circuit board setting error74Bluetooth communication problemF76Multisystem communication error760Remote controller transmission abnormality79Pump control circuit malfunction90Airflow or combustion abnormality91Incorrect gas type92Neutralizer nearing end of life (first warning)93Neutralizer at end of life94Exhaust temperature too high