Water heaters
Navien error codes
Navien NPE-2 tankless water heater error codes, from Navien's own user's information manual.
Navien tankless water heater codes (15)
- E003Ignition failure
- E004False flame detection
- E012Flame loss
- E016Heat exchanger overheating
- E030Exhaust overheating
- E031Burner overheating
- E109Fan motor fault
- E110Abnormal air pressure
- E407Hot water outlet thermistor
- E421Cold water inlet thermistor
- E439Flow sensor fault
- E515PCB fault
- E760Flushing / service alarm
- E762Vent pipe not properly inserted
- E773Wrong gas / gas type mismatch
No code matches. Try the AI helper.