Tankless water heater error codes
52 tankless water heater codes from 3 brands. Pick your brand, or search the code from your display.
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Noritz tankless water heater codes 24
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
Rheem tankless water heater codes 11
1LLime deposit buildup11Gas shut-off valve not fully open12Gas service interrupted or LP gas low14Water heater overheating31Faulty inlet thermistor33Faulty outlet thermistor61Faulty blower motor66Faulty bypass motorP1Not enough water flow88Flush heat exchanger or replace water filter reminder90Air intake or vent exhaust blocked
Rinnai tankless water heater codes 17
02No burner operation during freeze protection mode03Power interruption during bath fill10Air supply or exhaust blockage11No ignition12Flame failure14Thermal fuse16Over temperature warning31Burner sensor error32Outgoing water temperature sensor fault33Heat exchanger outgoing temperature sensor fault34Combustion air temperature sensor fault52Modulating solenoid valve signal abnormal61Combustion fan failure65Water flow servo faulty72Flame sensing device fault73Burner sensor circuit errorLCScale build-up in heat exchanger