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Navien Furnace Error Codes: Meanings & Safe Checks
Choose the code exactly as shown. Meanings and reset procedures can change across model families, display formats and markets.
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E003 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E003 as ignition failure or clogged vents. Search/display variants: E003, E003-00 stop-use E004 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E004 as false flame. The official table associates it with subcode 00. Search/display variants: E004, E004-00 stop-use E012 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E012 as flame loss during combustion. Search/display variants: E012, E012-00 stop-use E016 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E016 as heat exchanger overheating. Search/display variants: E016, E016-00 stop-use E030 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E030 as abnormal exhaust gas temperature lockout. Search/display variants: E030, E030-02 caution E031 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E031 as burner overheating. Search/display variants: E031, E031-00 stop-use E046 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E046 as abnormal heat-exchanger limit-control operation. Search/display variants: E046, E046-00 caution E047-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E047-01 as abnormal exhaust temperature sensor operation at the lower… Search/display variants: E047-01, E04701 caution E047-02 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E047-02 as abnormal exhaust temperature sensor operation at the upper… Search/display variants: E047-02, E04702 caution E109 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E109 as abnormal inducer fan operation. Search/display variants: E109, E109-00 caution E205-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E205-01 as abnormal supply-water temperature sensor operation at the… Search/display variants: E205-01, E20501 caution E205-02 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E205-02 as abnormal supply-water temperature sensor operation at the… Search/display variants: E205-02, E20502 caution E218-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E218-01 as abnormal return-water temperature sensor operation at the… Search/display variants: E218-01, E21801 caution E218-02 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E218-02 as abnormal return-water temperature sensor operation at the… Search/display variants: E218-02, E21802 caution E238-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E238-01 as abnormal recirculation-pump operation: pump on with no… Search/display variants: E238-01, E23801 caution E238-02 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E238-02 as abnormal recirculation-pump operation: pump off with water… Search/display variants: E238-02, E23802 caution E302 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E302 as low water level. Search/display variants: E302, E302-00 caution E311 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E311 as abnormal water level. Search/display variants: E311, E311-00 caution E351 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E351 as abnormal water fill. Search/display variants: E351, E351-00 caution E360 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E360 as abnormal cover opening or abnormal ac 24 v transformer output. Search/display variants: E360, E360-00 caution E515-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-01 as abnormal wd-pss1 status. Search/display variants: E515-01, E51501 caution E515-02 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-02 as abnormal wd-pss2 status. Search/display variants: E515-02, E51502 caution E515-03 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-03 as abnormal mgv1 status. Search/display variants: E515-03, E51503 caution E515-04 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-04 as abnormal mgv2 status. Search/display variants: E515-04, E51504 caution E515-09 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-09 as abnormal fan control. Search/display variants: E515-09, E51509 caution E515-10 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-10 as abnormal monitoring-device status. Search/display variants: E515-10, E51510 caution E515-16 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-16 as abnormal aws feedback. Search/display variants: E515-16, E51516 caution E515-24 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-24 as abnormal leakage input. Search/display variants: E515-24, E51524 stop-use E517 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E517 as abnormal dip switch settings. Search/display variants: E517, E517-00 caution E593 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E593 as abnormal front-panel key. Search/display variants: E593, E593-00 caution E594 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E594 as abnormal eeprom operation. Search/display variants: E594, E594-00 caution E615-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E615-01 as abnormal overheat-controller feedback. Search/display variants: E615-01, E61501 stop-use E615-03 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E615-03 as abnormal flame-signal input. Search/display variants: E615-03, E61503 caution E615-04 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E615-04 as abnormal adc reference voltage. Search/display variants: E615-04, E61504 caution E615-05 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E615-05 as abnormal mcu operation. Search/display variants: E615-05, E61505 caution E740 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E740 as abnormal outdoor-temperature sensor operation. Search/display variants: E740, E740-01, E740-02 caution E762 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E762 as improper vent-pipe installation. Search/display variants: E762, E762-00 stop-use E774 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E774 as abnormal external safety-system operation 1. Search/display variants: E774, E774-00 caution E775 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E775 as abnormal external safety-system operation 2. Search/display variants: E775, E775-00 caution E782 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E782 as abnormal controller-to-panel communication. Search/display variants: E782, E782-00 caution E786 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E786 as abnormal front control-panel connection. Search/display variants: E786, E786-00 caution E788 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E788 as abnormal gas-type settings. Search/display variants: E788, E788-00 stop-use E799-00 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E799-00 as leak detected by the leak sensor. Search/display variants: E799-00, E79900 stop-use E799-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E799-01 as leak detected through the water-level condition. Search/display variants: E799-01, E79901 stop-use E805-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E805-01 as abnormal supply-air temperature sensor operation at the… Search/display variants: E805-01, E80501 caution E805-02 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E805-02 as abnormal supply-air temperature sensor operation at the… Search/display variants: E805-02, E80502 caution E810 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E810 as abnormal circulator operation; ecm motor inoperable (subcodes… Search/display variants: E810 caution E811 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E811 as abnormal circulator operation; circulator inoperable. Search/display variants: E811, E811-00 caution E818-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E818-01 as abnormal return-air temperature sensor operation at the… Search/display variants: E818-01, E81801 caution E818-02 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E818-02 as abnormal return-air temperature sensor operation at the… Search/display variants: E818-02, E81802 caution E822 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E822 as air-conditioning evaporator coil overcooling. Search/display variants: E822, E822-00 caution E860-01 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E860-01 as circulator filter replacement alert. Search/display variants: E860-01, E86001 caution E860-02 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E860-02 as humidifier-pad replacement alert. Search/display variants: E860-02, E86002 caution E860-03 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E860-03 as uv-light replacement alert. Search/display variants: E860-03, E86003 caution E890 The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E890 as abnormal circulator communication. Search/display variants: E890, E890-00 caution