⚡
Navien — NHB
Select a fault code
Fault Codes
E001Ignition failure🔄 Try Reset
Failed ignition sequence — gas supply, igniter, or burner fault.
E010Primary circuit overheat🔧 Engineer Required
Overheating in the primary circuit.
E030Fan speed fault🔧 Engineer Required
Fan motor or speed sensor fault.
E032Air pressure switch fault🔧 Engineer Required
Air pressure switch not making — blocked flue, stuck switch, or fan fault.
E046Low water pressure🔄 Try Reset
System pressure below minimum level.
E111Flow temperature sensor fault🔧 Engineer Required
Flow thermistor open circuit or short circuit.
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Gas Emergency
🚨 0800 111 999
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