Navien
Navien Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E001
Boiler will not ignite and displays E001 on the control panel.
Ignition Failure / Flame Not Established
E002
Boiler shuts down with E002 and does not fire, often after attempting ignition.
Low Water Pressure / Flow Switch Fault
E003
Boiler locks out with E003 shortly after an ignition attempt, sometimes with a brief flame.
Ignition / Flame Loss During Operation
E004
Boiler displays E004 and will not start, often accompanied by the fan running briefly.
Air Pressure Switch / Combustion Air Proving Failure
E005
Boiler shows E005 and shuts down during operation, often with high temperature readings.
Overheating / High Limit Trip
E006
Boiler displays E006 and stops heating, often associated with low temperature readings or a sensor error.
Outlet Water Temperature Sensor Fault
E007
Boiler shows E007 and will not operate, often immediately at startup.
Inlet Water Temperature Sensor Fault
E010
Boiler displays E010 and shuts down, often during or after a heating cycle.
Abnormal Air Pressure / Fan or Venting Fault
E011
Boiler displays E011 and will not fire, often after the fan starts.
Air Pressure Switch Stuck or Out of Range
E012
Boiler intermittently displays E012 and shuts down, often during high demand.
Flame Loss / Unstable Combustion
E016
Boiler displays E016 and stops heating, often after running for some time.
Overheat / Outlet Temperature Too High
E018
Boiler displays E018 and will not operate, often after a power event.
Low Voltage / Power Supply Error
E020
Boiler displays E020 and stops, often with no circulation in the system.
Circulation Pump Fault
E027
Boiler displays E027 and locks out, often immediately at startup.
Exhaust Overheat / Flue Gas Temperature Too High
E030
Boiler intermittently displays E030 and stops heating.
Outdoor Temperature Sensor Fault (if equipped)
E046
Boiler displays E046 and will not operate, often after configuration changes.
Communication Error Between Main PCB and Front Panel / Add‑On Module
E060
Boiler displays E060 and stops, often with no response to thermostat calls.
Thermostat / Room Controller Input Fault
E109
Boiler displays E109 and locks out, often during ignition attempts.
Gas Valve / Gas Supply Error
E110
Boiler intermittently displays E110 and stops heating, often during long runs.
Return Water Temperature Sensor Fault
E127
Boiler displays E127 and will not operate, often after service work.
Internal Configuration / Parameter Error
E302
Boiler displays E302 and locks out, often with no ignition attempt.
Flame Detection Error (Flame Present When Not Commanded)
E407
Boiler displays E407 and will not operate, often after connecting external controls.
Communication Error with External Controller / Cascade Manager
Symptom
Boiler condensate trap overflows, or water drips from the bottom during operation.
Condensate Drainage Failure
Symptom
Boiler cycles on but quickly shuts off with gurgling sounds inside the unit.
Air in Heat Exchanger / Poor Circulation
Symptom
Boiler display is on but unresponsive, or buttons do not work reliably.
Control Panel / User Interface Failure
Symptom
Boiler frequently goes into lockout with random error codes after lightning or power surges.
Surge Damage / Intermittent Control Fault
Symptom
Boiler frequently loses pressure and needs to be topped up.
Chronic Pressure Loss / System Leak
Symptom
Boiler is very noisy with a high-pitched whine or rumble during operation.
Combustion or Fan Noise
Symptom
Boiler leaking water from the bottom of the cabinet.
Internal Water Leak
Symptom
Boiler locks out frequently during very cold weather, but no specific error code is shown.
Freeze Protection / Low Temperature Lockout
Symptom
Boiler makes loud banging or knocking noises when starting or stopping.
Water Hammer / Thermal Expansion Noise
Symptom
Boiler pressure gauge frequently rises above 30 psi, and the relief valve discharges water.
System Overpressure
Symptom
Boiler produces a strong exhaust or burning smell near the unit.
Combustion / Venting Odor Issue
Symptom
Boiler runs but radiators or in-floor loops stay lukewarm or cold.
Insufficient Space Heating Output
Symptom
Boiler short cycles (turns on and off frequently) during heating.
Short Cycling / Control or System Imbalance
Symptom
Boiler will not start at all; display is blank.
No Power / Dead Control
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E001 |
Boiler will not ignite and displays E001 on the control panel.
|
Ignition Failure / Flame Not Established | View Details |
| E002 |
Boiler shuts down with E002 and does not fire, often after attempting ignition.
|
Low Water Pressure / Flow Switch Fault | View Details |
| E003 |
Boiler locks out with E003 shortly after an ignition attempt, sometimes with a brief flame.
|
Ignition / Flame Loss During Operation | View Details |
| E004 |
Boiler displays E004 and will not start, often accompanied by the fan running briefly.
|
Air Pressure Switch / Combustion Air Proving Failure | View Details |
| E005 |
Boiler shows E005 and shuts down during operation, often with high temperature readings.
|
Overheating / High Limit Trip | View Details |
| E006 |
Boiler displays E006 and stops heating, often associated with low temperature readings or a sensor error.
|
Outlet Water Temperature Sensor Fault | View Details |
| E007 |
Boiler shows E007 and will not operate, often immediately at startup.
|
Inlet Water Temperature Sensor Fault | View Details |
| E010 |
Boiler displays E010 and shuts down, often during or after a heating cycle.
|
Abnormal Air Pressure / Fan or Venting Fault | View Details |
| E011 |
Boiler displays E011 and will not fire, often after the fan starts.
|
Air Pressure Switch Stuck or Out of Range | View Details |
| E012 |
Boiler intermittently displays E012 and shuts down, often during high demand.
|
Flame Loss / Unstable Combustion | View Details |
| E016 |
Boiler displays E016 and stops heating, often after running for some time.
|
Overheat / Outlet Temperature Too High | View Details |
| E018 |
Boiler displays E018 and will not operate, often after a power event.
|
Low Voltage / Power Supply Error | View Details |
| E020 |
Boiler displays E020 and stops, often with no circulation in the system.
|
Circulation Pump Fault | View Details |
| E027 |
Boiler displays E027 and locks out, often immediately at startup.
|
Exhaust Overheat / Flue Gas Temperature Too High | View Details |
| E030 |
Boiler intermittently displays E030 and stops heating.
|
Outdoor Temperature Sensor Fault (if equipped) | View Details |
| E046 |
Boiler displays E046 and will not operate, often after configuration changes.
|
Communication Error Between Main PCB and Front Panel / Add‑On Module | View Details |
| E060 |
Boiler displays E060 and stops, often with no response to thermostat calls.
|
Thermostat / Room Controller Input Fault | View Details |
| E109 |
Boiler displays E109 and locks out, often during ignition attempts.
|
Gas Valve / Gas Supply Error | View Details |
| E110 |
Boiler intermittently displays E110 and stops heating, often during long runs.
|
Return Water Temperature Sensor Fault | View Details |
| E127 |
Boiler displays E127 and will not operate, often after service work.
|
Internal Configuration / Parameter Error | View Details |
| E302 |
Boiler displays E302 and locks out, often with no ignition attempt.
|
Flame Detection Error (Flame Present When Not Commanded) | View Details |
| E407 |
Boiler displays E407 and will not operate, often after connecting external controls.
|
Communication Error with External Controller / Cascade Manager | View Details |
| – |
Boiler condensate trap overflows, or water drips from the bottom during operation.
|
Condensate Drainage Failure | View Details |
| – |
Boiler cycles on but quickly shuts off with gurgling sounds inside the unit.
|
Air in Heat Exchanger / Poor Circulation | View Details |
| – |
Boiler display is on but unresponsive, or buttons do not work reliably.
|
Control Panel / User Interface Failure | View Details |
| – |
Boiler frequently goes into lockout with random error codes after lightning or power surges.
|
Surge Damage / Intermittent Control Fault | View Details |
| – |
Boiler frequently loses pressure and needs to be topped up.
|
Chronic Pressure Loss / System Leak | View Details |
| – |
Boiler is very noisy with a high-pitched whine or rumble during operation.
|
Combustion or Fan Noise | View Details |
| – |
Boiler leaking water from the bottom of the cabinet.
|
Internal Water Leak | View Details |
| – |
Boiler locks out frequently during very cold weather, but no specific error code is shown.
|
Freeze Protection / Low Temperature Lockout | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or stopping.
|
Water Hammer / Thermal Expansion Noise | View Details |
| – |
Boiler pressure gauge frequently rises above 30 psi, and the relief valve discharges water.
|
System Overpressure | View Details |
| – |
Boiler produces a strong exhaust or burning smell near the unit.
|
Combustion / Venting Odor Issue | View Details |
| – |
Boiler runs but radiators or in-floor loops stay lukewarm or cold.
|
Insufficient Space Heating Output | View Details |
| – |
Boiler short cycles (turns on and off frequently) during heating.
|
Short Cycling / Control or System Imbalance | View Details |
| – |
Boiler will not start at all; display is blank.
|
No Power / Dead Control | View Details |
No matching codes found
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