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Navien Boilers

Navien Combi Boilers

Navien combi boilers a wall mounted units with a small footprint that are commonly located in a kitchen or bathroom and concealed within a cupboard and supply quick access to hot water directly from the mains water supply to radiators and taps. Navien combi boilers are energy efficient units with low running costs that are ideally suited to apartments and small to medium sized houses with 1 to 2 bathrooms. Navien combi boilers don’t require hot water tanks or cylinders as a regular boiler or system boiler does therefore making these Navien combi boilers cheaper to install.
BoilerEfficiencyOutputWarrantyMPNBoiler Type
Navien NCB 24kW Gas Combi Boiler92%24kW7 YearsCombi
Navien NCB 28kW Gas Combi Boiler93%28kW7 YearsCombi
Navien NCB 34kW Gas Combi Boiler93%34kW7 YearsCombi
Navien NCB 40kW Gas Combi Boiler93%40kW7 YearsCombi

Navien System Boilers

BoilerEfficiencyOutputWarrantyMPNBoiler Type
Navien LCB700 21kW External Oil System Boiler93%21kW10 YearsSystem
Navien LCB700 21kW Internal Oil System Boiler93%21kW10 YearsSystem
Navien LCB700 28kW External Oil System Boiler93%28kW10 YearsSystem
Navien LCB700 28kW Internal Oil System Boiler93%28kW10 YearsSystem
Navien LCB700 36kW External Oil System Boiler93%36kW10 YearsSystem
Navien LCB700 36kW Internal Oil System Boiler93%36kW10 YearsSystem
Navien NCB 20kW Gas System Boiler92%20kW7 YearsSystem
Navien NCB 23kW Gas System Boiler93%23kW7 YearsSystem
Navien NCB 28kW Gas System Boiler93%28kW7 YearsSystem
Navien NCB 33kW Gas System Boiler93%33kW7 YearsSystem

Navien Regular Boilers

BoilerEfficiencyOutputWarrantyMPNBoiler Type
Navien LCB700 21kW External Oil Regular Boiler93%21kW10 YearsRegular
Navien LCB700 21kW Internal Oil Regular Boiler93%21kW10 YearsRegular
Navien LCB700 28kW External Oil Regular Boiler93%28kW10 YearsRegular
Navien LCB700 28kW Internal Oil Regular Boiler93%28kW10 YearsRegular
Navien LCB700 36kW External Oil Regular Boiler93%36kW10 YearsRegular
Navien LCB700 36kW Internal Oil Regular Boiler93%36kW10 YearsRegular
BoilerError / Fault CodeFault Description
Combi and System003Ignition failure – manual reset needed
Comb and System004False flame error – the boiler will auto-reset
Combi and System012Flame loss – reset the boiler
Combi and System016Heat exchanger overheated – try manually resetting the boiler
Combi and System030Abnormal exhaust temperature – try manually resetting the boiler
Combi and System046Abnormal operation: Heat exchanger overheating – the boiler should auto-reset
Combi and System047Abnormal operation: Exhaust thermostat error – a manual reset is needed if it the boiler doesn’t auto-reset
Combi and System060Abnormal operation: Dual venturi limit switch – boiler will auto-reset
Combi and System109Abnormal operation: Fan error – the boiler needs resetting
Combi and System110Exhaust blockage (condensate blockage) – reset the boiler
Combi and System127Abnormal operation: Air pressure switch (APS) issue – reset the boiler
Combi and System205Heating supply thermistor open or short circuit – boiler should auto-reset
Combi and System218Alarm error: Heating return thermistor open or short circuit
Combi and System302Low water pressure – boiler should auto-reset
Combi and System352High water pressure – boiler should auto-reset
Combi and System353Abnormal operation: Water pressure sensor error – boiler should auto-reset
System407Abnormal operation: Hot water outlet thermistor – alarm error
System421Abnormal operation: Cold water inlet thermistor Auto reset should automatically occur
Combi and System480Abnormal operation: External domestic hot water (DHW) tank outlet thermistor – alarm error
Combi and System515Abnormal operation: Relay feedback (PCB) – the boiler needs to be reset
Combi and System517Abnormal operation: Dual in-line package (DIP) switch setting (PCB) – boiler needs to be reset
Combi and System594Abnormal operation: EEPROM (PCB) – contact an engineer
Combi and System615Abnormal operation: Input and memory (MCU) – try resetting the boiler
Combi and System740Abnormal operation: Outdoor temperature sensor – boiler should automatically reset
Combi and System782Abnormal operation: Main panel communication – boiler should auto-reset
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