Nibe
Nibe Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Boiler locked out, red fault lamp on, no heating or hot water.
Ignition Failure Lockout
E02
Boiler attempts to start but shuts down with an overheat alarm; flow temperature is very high.
Primary Circuit Overheat Trip
E03
Boiler displays a flue/venting error; the burner stops shortly after an ignition attempt.
Flue Gas Safety / Ventilation Fault
E04
Boiler displays a low water pressure alarm; heating and hot water are disabled.
Low System Pressure
E05
Boiler displays a high pressure alarm; the pressure gauge is above the safe range, and the safety valve may discharge water.
High System Pressure
E06
Boiler displays a flow temperature sensor fault; the burner does not start or cycles rapidly.
Flow Temperature Sensor Failure
E07
Boiler displays a return temperature sensor fault, leading to poor modulation or lockout.
Return Temperature Sensor Failure
E08
Boiler displays a domestic hot water (DHW) sensor error; hot water temperature is unstable or disabled.
DHW Temperature Sensor Fault
E09
Boiler indicates an outdoor sensor fault (for weather-compensated systems); the heating curve is not followed.
Outdoor Temperature Sensor Failure
E10
Boiler displays a fan speed or fan feedback error; the burner does not ignite.
Fan Speed Control / Air Pressure Fault
E11
Boiler displays flame loss during operation, followed by repeated ignition attempts and then lockout.
Flame Supervision Fault
E12
The boiler shows a communication error between the main PCB and the user interface, or between the boiler and the Nibe accessory module.
Internal Communication Fault
E13
The boiler indicates a sensor short-circuit or over-temperature on the flue gas sensor.
Flue Gas Temperature Sensor Fault
E14
The boiler shows a condensate fault or a blocked condensate drain; the unit may shut down.
Condensate Drain Blockage
E15
The boiler indicates a flow switch or flow sensor error; the burner will not start.
Insufficient Water Flow / Flow Switch Fault
E16
The boiler shows a DHW flow sensor error; there is no hot water despite a demand.
DHW Flow Detection Fault
E17
The boiler indicates a gas valve or gas modulation fault; there is no flame or an unstable flame.
Gas Valve Control Error
E18
The boiler shows a power supply or mains frequency error, resulting in intermittent resets.
Mains Supply / Power Quality Fault
E19
The boiler indicates a sensor fault on heating circuit 2 or the mixing circuit (if equipped).
Secondary Circuit Sensor Fault
E20
The boiler shows an internal overheat or a safety thermostat trip, resulting in a complete lockout.
Manual Reset Safety Thermostat Trip
Symptom
Boiler cycles on and off rapidly without reaching set temperature
Short Cycling
Symptom
Boiler display works but there is no response to heating or hot water demand
Demand Signal Failure
Symptom
Boiler does not start at all, display blank or unresponsive
No Power / Dead Boiler
Symptom
Boiler frequently goes into frost protection mode even when not particularly cold indoors
Incorrect Temperature Sensing / Control Logic
Symptom
Boiler frequently locks out and needs manual reset, with varying error messages
Intermittent Control or Sensor Issues
Symptom
Boiler frequently loses pressure over days or weeks without visible leaks
Chronic Pressure Loss
Symptom
Boiler is very noisy during operation (whining, grinding, or rattling)
Mechanical Noise / Wear
Symptom
Boiler makes loud banging or knocking noises when starting or stopping
Kettling / Hydraulic Shock
Symptom
Boiler or flue emits unusual smells (burning, chemical, or flue gas odour)
Overheating or Combustion Issue
Symptom
Boiler runs but hot water temperature fluctuates or goes cold during shower
Unstable DHW Temperature
Symptom
Boiler runs but radiators stay cold or only lukewarm
Poor Heating Performance
Symptom
Boiler runs continuously and overheats the house even when room thermostat is turned down
Control / Thermostat Fault
Symptom
Boiler’s condensate pipe drips constantly even when boiler is off
Condensate or System Water Passing
Symptom
Radiators upstairs are hot but downstairs are cold
Imbalanced or Sludged Heating Circuit
Symptom
The boiler is leaking water from underneath the casing.
Internal Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Boiler locked out, red fault lamp on, no heating or hot water.
|
Ignition Failure Lockout | View Details |
| E02 |
Boiler attempts to start but shuts down with an overheat alarm; flow temperature is very high.
|
Primary Circuit Overheat Trip | View Details |
| E03 |
Boiler displays a flue/venting error; the burner stops shortly after an ignition attempt.
|
Flue Gas Safety / Ventilation Fault | View Details |
| E04 |
Boiler displays a low water pressure alarm; heating and hot water are disabled.
|
Low System Pressure | View Details |
| E05 |
Boiler displays a high pressure alarm; the pressure gauge is above the safe range, and the safety valve may discharge water.
|
High System Pressure | View Details |
| E06 |
Boiler displays a flow temperature sensor fault; the burner does not start or cycles rapidly.
|
Flow Temperature Sensor Failure | View Details |
| E07 |
Boiler displays a return temperature sensor fault, leading to poor modulation or lockout.
|
Return Temperature Sensor Failure | View Details |
| E08 |
Boiler displays a domestic hot water (DHW) sensor error; hot water temperature is unstable or disabled.
|
DHW Temperature Sensor Fault | View Details |
| E09 |
Boiler indicates an outdoor sensor fault (for weather-compensated systems); the heating curve is not followed.
|
Outdoor Temperature Sensor Failure | View Details |
| E10 |
Boiler displays a fan speed or fan feedback error; the burner does not ignite.
|
Fan Speed Control / Air Pressure Fault | View Details |
| E11 |
Boiler displays flame loss during operation, followed by repeated ignition attempts and then lockout.
|
Flame Supervision Fault | View Details |
| E12 |
The boiler shows a communication error between the main PCB and the user interface, or between the boiler and the Nibe accessory module.
|
Internal Communication Fault | View Details |
| E13 |
The boiler indicates a sensor short-circuit or over-temperature on the flue gas sensor.
|
Flue Gas Temperature Sensor Fault | View Details |
| E14 |
The boiler shows a condensate fault or a blocked condensate drain; the unit may shut down.
|
Condensate Drain Blockage | View Details |
| E15 |
The boiler indicates a flow switch or flow sensor error; the burner will not start.
|
Insufficient Water Flow / Flow Switch Fault | View Details |
| E16 |
The boiler shows a DHW flow sensor error; there is no hot water despite a demand.
|
DHW Flow Detection Fault | View Details |
| E17 |
The boiler indicates a gas valve or gas modulation fault; there is no flame or an unstable flame.
|
Gas Valve Control Error | View Details |
| E18 |
The boiler shows a power supply or mains frequency error, resulting in intermittent resets.
|
Mains Supply / Power Quality Fault | View Details |
| E19 |
The boiler indicates a sensor fault on heating circuit 2 or the mixing circuit (if equipped).
|
Secondary Circuit Sensor Fault | View Details |
| E20 |
The boiler shows an internal overheat or a safety thermostat trip, resulting in a complete lockout.
|
Manual Reset Safety Thermostat Trip | View Details |
| – |
Boiler cycles on and off rapidly without reaching set temperature
|
Short Cycling | View Details |
| – |
Boiler display works but there is no response to heating or hot water demand
|
Demand Signal Failure | View Details |
| – |
Boiler does not start at all, display blank or unresponsive
|
No Power / Dead Boiler | View Details |
| – |
Boiler frequently goes into frost protection mode even when not particularly cold indoors
|
Incorrect Temperature Sensing / Control Logic | View Details |
| – |
Boiler frequently locks out and needs manual reset, with varying error messages
|
Intermittent Control or Sensor Issues | View Details |
| – |
Boiler frequently loses pressure over days or weeks without visible leaks
|
Chronic Pressure Loss | View Details |
| – |
Boiler is very noisy during operation (whining, grinding, or rattling)
|
Mechanical Noise / Wear | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or stopping
|
Kettling / Hydraulic Shock | View Details |
| – |
Boiler or flue emits unusual smells (burning, chemical, or flue gas odour)
|
Overheating or Combustion Issue | View Details |
| – |
Boiler runs but hot water temperature fluctuates or goes cold during shower
|
Unstable DHW Temperature | View Details |
| – |
Boiler runs but radiators stay cold or only lukewarm
|
Poor Heating Performance | View Details |
| – |
Boiler runs continuously and overheats the house even when room thermostat is turned down
|
Control / Thermostat Fault | View Details |
| – |
Boiler’s condensate pipe drips constantly even when boiler is off
|
Condensate or System Water Passing | View Details |
| – |
Radiators upstairs are hot but downstairs are cold
|
Imbalanced or Sludged Heating Circuit | View Details |
| – |
The boiler is leaking water from underneath the casing.
|
Internal Water Leak | View Details |
No matching codes found
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