Equipment guide
Furnace error codes
Codes are manufacturer-specific. Choose the exact brand shown on your equipment.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E003 as ignition failure or clogged vents. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E004 as false flame. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E012 as flame loss during combustion. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E016 as heat exchanger overheating. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E030 as abnormal exhaust gas temperature lockout. The official table associates it with subcode 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E031 as burner overheating. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E046 as abnormal heat-exchanger limit-control operation. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E047-01 as abnormal exhaust temperature sensor operation at the lower limit. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E047-02 as abnormal exhaust temperature sensor operation at the upper limit. The official table associates it with subcode 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E109 as abnormal inducer fan operation. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E205-01 as abnormal supply-water temperature sensor operation at the lower limit. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E205-02 as abnormal supply-water temperature sensor operation at the upper limit. The official table associates it with subcode 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E218-01 as abnormal return-water temperature sensor operation at the lower limit. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E218-02 as abnormal return-water temperature sensor operation at the upper limit. The official table associates it with subcode 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E238-01 as abnormal recirculation-pump operation: pump on with no water flow detected. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E238-02 as abnormal recirculation-pump operation: pump off with water flow detected. The official table associates it with subcode 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E302 as low water level. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E311 as abnormal water level. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E351 as abnormal water fill. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E360 as abnormal cover opening or abnormal ac 24 v transformer output. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-01 as abnormal wd-pss1 status. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-02 as abnormal wd-pss2 status. The official table associates it with subcode 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-03 as abnormal mgv1 status. The official table associates it with subcode 03. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-04 as abnormal mgv2 status. The official table associates it with subcode 04. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-09 as abnormal fan control. The official table associates it with subcode 09. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-10 as abnormal monitoring-device status. The official table associates it with subcode 10. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-16 as abnormal aws feedback. The official table associates it with subcode 16. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E515-24 as abnormal leakage input. The official table associates it with subcode 24. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E517 as abnormal dip switch settings. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E593 as abnormal front-panel key. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E594 as abnormal eeprom operation. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E615-01 as abnormal overheat-controller feedback. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E615-03 as abnormal flame-signal input. The official table associates it with subcode 03. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E615-04 as abnormal adc reference voltage. The official table associates it with subcode 04. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E615-05 as abnormal mcu operation. The official table associates it with subcode 05. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E740 as abnormal outdoor-temperature sensor operation. The official table associates it with subcodes 01 and 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E762 as improper vent-pipe installation. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E774 as abnormal external safety-system operation 1. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E775 as abnormal external safety-system operation 2. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E782 as abnormal controller-to-panel communication. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E786 as abnormal front control-panel connection. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E788 as abnormal gas-type settings. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E799-00 as leak detected by the leak sensor. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E799-01 as leak detected through the water-level condition. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E805-01 as abnormal supply-air temperature sensor operation at the lower limit. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E805-02 as abnormal supply-air temperature sensor operation at the upper limit. The official table associates it with subcode 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E810 as abnormal circulator operation; ecm motor inoperable (subcodes 00 through 99). This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E811 as abnormal circulator operation; circulator inoperable. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E818-01 as abnormal return-air temperature sensor operation at the lower limit. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E818-02 as abnormal return-air temperature sensor operation at the upper limit. The official table associates it with subcode 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E822 as air-conditioning evaporator coil overcooling. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E860-01 as circulator filter replacement alert. The official table associates it with subcode 01. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E860-02 as humidifier-pad replacement alert. The official table associates it with subcode 02. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E860-03 as uv-light replacement alert. The official table associates it with subcode 03. This meaning is limited to the documented NPF700 condensing hydro-furnace.
The official NPF Condensing Hydro-furnace Installation and Operation Manual identifies E890 as abnormal circulator communication. The official table associates it with subcode 00. This meaning is limited to the documented NPF700 condensing hydro-furnace.