BoilerFaultCodes
Navien Boiler Fault Codes
380 fault codes across 15 Navien boiler models — explained in plain English.
Korean manufacturer known for high-efficiency condensing combi boilers.
Navien fault codes on this site
We document 380 fault codes across 15 Navien models, covering 189 distinct codes. Navien boilers use a mix of numbered codes and light or status indications. Codes for 14 of these models are taken directly from the manufacturer's own service or installation manual.
Models covered: NCB-28LDWE, NCB-34LDWE, NCB-40LDWE, LCB700, NCB-24LDWE, NCB CE, NCB, NPE, NCM 1130HH, NCB500, NCB-20LHWE, NCB-23LHWE, NCB-28LHWE, NCB-33LHWE, NCB300.
Just want the most common Navien problems?
The top 8 faults across the whole Navien range — causes, DIY checks, repair costs.
High-severity Navien fault codes
E02 003 016 060 110
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
NCB-28LDWE
Your boiler has failed to light the flame properly and has stopped attempting to heat your home or water for safety reasons.
NCB-28LDWE
Your boiler has detected an issue related to the flow of water inside the unit, which has caused it to stop working to protect itself from potential overheating.
NCB-28LDWE
Your boiler has detected an issue with the air supply or exhaust system, meaning it cannot operate safely and has shut down to prevent damage.
NCB-28LDWE
Your boiler has detected that it is not effectively removing waste gases produced during the heating process, causing it to shut down for safety.
NCB-28LDWE
All models
15 Navien boiler models
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