Ferroli
Ferroli Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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A01
Boiler attempts to ignite but fails; you hear clicking from the ignition, then the boiler locks out and displays A01.
Ignition Failure / Flame Not Detected
A02
Boiler lights but then shuts down quickly with error A02; may show signs of overheating such as very hot flow pipe and noisy boiling sounds.
Primary Circuit Overheat / Overheat Thermostat Tripped
A03
Boiler locks out with A03 shortly after starting; may be accompanied by very hot return pipe and no heat to radiators.
Safety Thermostat Intervention / Overtemperature Lockout
A04
Boiler displays A04 and will not start; may be associated with low or zero pressure on the gauge.
Low Water Pressure / Insufficient System Water
A05
Boiler shows A05 and shuts down; may occur intermittently during operation, often related to flue or air issues.
Flue Gas / Air Pressure Switch Fault
A06
Boiler locks out with A06; may start then stop with no stable flame, often in windy conditions or with flue issues.
Flame Instability / Flame Loss During Operation
A07
Boiler displays A07 and will not fire; often associated with incorrect temperature readings or sensor faults.
Flow Temperature Sensor (NTC) Fault
A08
Boiler shows A08; may relate to return temperature sensor issues or inconsistent temperature readings.
Return Temperature Sensor (NTC) Fault
A09
Boiler locks out with A09; may be associated with flue gas recirculation or combustion issues.
Flue Gas Temperature / Combustion Safety Fault
A10
Boiler shows A10 and stops; often related to domestic hot water (DHW) temperature sensing issues on combi models.
DHW Temperature Sensor (NTC) Fault
A11
Boiler displays A11; may be associated with incorrect fan speed feedback or air pressure issues.
Fan / Airflow Control Fault
A21
Boiler shows A21; often related to communication or configuration issues between control board and user interface.
Control Board / User Interface Communication Fault
A34
Boiler displays A34; may be associated with low mains voltage or power supply issues.
Low Mains Voltage / Power Supply Fault
F01
Boiler shows F01 and will not operate; often indicates a flow sensor or circulation issue on some Ferroli models.
Flow Sensor / Circulation Fault
F02
Boiler displays F02; may be associated with NTC sensor faults depending on model.
Temperature Sensor Fault (Generic)
F03
Boiler shows F03; often indicates a flue or fan-related safety fault on some Ferroli boilers.
Flue / Fan Safety Fault
F04
Boiler displays F04 and locks out; may be related to flame detection issues.
Flame Detection Fault
F05
Boiler shows F05; often associated with pump or circulation problems on some Ferroli models.
Pump / Circulation Fault
F10
Boiler displays F10; often indicates a flow temperature sensor open circuit on some Ferroli models.
Flow NTC Open Circuit
F11
Boiler shows F11; often indicates a flow temperature sensor short circuit on some Ferroli models.
Flow NTC Short Circuit
F20
Boiler displays F20; may indicate a return NTC open circuit on some Ferroli models.
Return NTC Open Circuit
F21
Boiler shows F21; may indicate a return NTC short circuit on some Ferroli boilers.
Return NTC Short Circuit
F34
Boiler displays F34; typically indicates low mains voltage on many Ferroli models.
Low Mains Voltage
F37
Boiler shows F37; often indicates low water pressure on many Ferroli combi boilers.
Low System Pressure
F40
Boiler displays F40; usually indicates high system pressure on Ferroli boilers.
High System Pressure
F41
Boiler shows F41; may indicate ignition or flame failure on some Ferroli models.
Ignition / Flame Failure
F42
Boiler displays F42; may be associated with temperature sensor plausibility or differential issues.
Temperature Sensor Correlation Fault
F43
Boiler shows F43; often indicates a circulation or pump fault on some Ferroli models.
Circulation Fault / Pump Blocked
F50
Boiler displays F50; may indicate a fan speed or air pressure switch fault on some Ferroli models.
Fan Speed / Air Pressure Fault
F51
Boiler shows F51; may be related to gas valve or modulation control issues.
Gas Valve Control Fault
F61
Boiler displays F61; often indicates a gas valve or safety shut-off fault on some Ferroli models.
Gas Valve Safety Fault
F62
Boiler shows F62; may indicate delayed ignition or gas valve closing fault.
Delayed Ignition / Gas Valve Closure Fault
Symptom
Boiler display is on but there is no heating and no hot water demand response; boiler does not attempt to fire.
No Demand Recognition / Control Fault
Symptom
Boiler does not start at all; no display or lights, completely dead.
No Power / Dead Boiler
Symptom
Boiler emits a burning smell or plastic smell during operation, with or without visible smoke, but no error code.
Overheating Component / Electrical Overheat
Symptom
Boiler frequently cycles on and off rapidly when heating is on, with radiators getting very hot then cooling quickly.
Short Cycling / Oversized Boiler or Control Issue
Symptom
Boiler frequently loses pressure and needs topping up every few days, with no specific error code until pressure becomes very low.
Chronic Pressure Loss
Symptom
Boiler leaking water from underneath the casing or from pipe connections, with no error code displayed.
Internal Water Leak
Symptom
Boiler makes loud banging or knocking noises (kettling) during operation, especially when heating is on, with no error code.
Kettling / Localised Boiling in Heat Exchanger
Symptom
Boiler or flue makes a loud whooshing or roaring noise when firing, with no error code.
Combustion Noise / Incorrect Gas-Air Ratio
Symptom
Boiler provides hot water but central heating does not work, with no error code.
No Central Heating / Diverter Valve Fault
Symptom
Boiler runs for central heating but does not provide hot water on a combi model, with no error code.
No DHW Production on Combi Boiler
Symptom
Boiler vibrates excessively or rattles during operation, with no error code.
Mechanical Vibration / Loose Components
Symptom
Domestic hot water temperature fluctuates between hot and cold during use on a combi boiler, with no error code.
Inconsistent DHW Temperature / Modulation Fault
Symptom
External condensate pipe drips constantly or backs up, sometimes causing boiler lockouts in cold weather, with no specific code.
Condensate Drain Blockage / Freezing
Symptom
Radiators only get warm at the bottom or some radiators stay cold while others heat up normally.
Poor Circulation / Sludge Build-up
Symptom
Water drips from the copper pressure relief valve discharge pipe outside, especially when the boiler is running.
Pressure Relief Valve Discharging
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| A01 |
Boiler attempts to ignite but fails; you hear clicking from the ignition, then the boiler locks out and displays A01.
|
Ignition Failure / Flame Not Detected | View Details |
| A02 |
Boiler lights but then shuts down quickly with error A02; may show signs of overheating such as very hot flow pipe and noisy boiling sounds.
|
Primary Circuit Overheat / Overheat Thermostat Tripped | View Details |
| A03 |
Boiler locks out with A03 shortly after starting; may be accompanied by very hot return pipe and no heat to radiators.
|
Safety Thermostat Intervention / Overtemperature Lockout | View Details |
| A04 |
Boiler displays A04 and will not start; may be associated with low or zero pressure on the gauge.
|
Low Water Pressure / Insufficient System Water | View Details |
| A05 |
Boiler shows A05 and shuts down; may occur intermittently during operation, often related to flue or air issues.
|
Flue Gas / Air Pressure Switch Fault | View Details |
| A06 |
Boiler locks out with A06; may start then stop with no stable flame, often in windy conditions or with flue issues.
|
Flame Instability / Flame Loss During Operation | View Details |
| A07 |
Boiler displays A07 and will not fire; often associated with incorrect temperature readings or sensor faults.
|
Flow Temperature Sensor (NTC) Fault | View Details |
| A08 |
Boiler shows A08; may relate to return temperature sensor issues or inconsistent temperature readings.
|
Return Temperature Sensor (NTC) Fault | View Details |
| A09 |
Boiler locks out with A09; may be associated with flue gas recirculation or combustion issues.
|
Flue Gas Temperature / Combustion Safety Fault | View Details |
| A10 |
Boiler shows A10 and stops; often related to domestic hot water (DHW) temperature sensing issues on combi models.
|
DHW Temperature Sensor (NTC) Fault | View Details |
| A11 |
Boiler displays A11; may be associated with incorrect fan speed feedback or air pressure issues.
|
Fan / Airflow Control Fault | View Details |
| A21 |
Boiler shows A21; often related to communication or configuration issues between control board and user interface.
|
Control Board / User Interface Communication Fault | View Details |
| A34 |
Boiler displays A34; may be associated with low mains voltage or power supply issues.
|
Low Mains Voltage / Power Supply Fault | View Details |
| F01 |
Boiler shows F01 and will not operate; often indicates a flow sensor or circulation issue on some Ferroli models.
|
Flow Sensor / Circulation Fault | View Details |
| F02 |
Boiler displays F02; may be associated with NTC sensor faults depending on model.
|
Temperature Sensor Fault (Generic) | View Details |
| F03 |
Boiler shows F03; often indicates a flue or fan-related safety fault on some Ferroli boilers.
|
Flue / Fan Safety Fault | View Details |
| F04 |
Boiler displays F04 and locks out; may be related to flame detection issues.
|
Flame Detection Fault | View Details |
| F05 |
Boiler shows F05; often associated with pump or circulation problems on some Ferroli models.
|
Pump / Circulation Fault | View Details |
| F10 |
Boiler displays F10; often indicates a flow temperature sensor open circuit on some Ferroli models.
|
Flow NTC Open Circuit | View Details |
| F11 |
Boiler shows F11; often indicates a flow temperature sensor short circuit on some Ferroli models.
|
Flow NTC Short Circuit | View Details |
| F20 |
Boiler displays F20; may indicate a return NTC open circuit on some Ferroli models.
|
Return NTC Open Circuit | View Details |
| F21 |
Boiler shows F21; may indicate a return NTC short circuit on some Ferroli boilers.
|
Return NTC Short Circuit | View Details |
| F34 |
Boiler displays F34; typically indicates low mains voltage on many Ferroli models.
|
Low Mains Voltage | View Details |
| F37 |
Boiler shows F37; often indicates low water pressure on many Ferroli combi boilers.
|
Low System Pressure | View Details |
| F40 |
Boiler displays F40; usually indicates high system pressure on Ferroli boilers.
|
High System Pressure | View Details |
| F41 |
Boiler shows F41; may indicate ignition or flame failure on some Ferroli models.
|
Ignition / Flame Failure | View Details |
| F42 |
Boiler displays F42; may be associated with temperature sensor plausibility or differential issues.
|
Temperature Sensor Correlation Fault | View Details |
| F43 |
Boiler shows F43; often indicates a circulation or pump fault on some Ferroli models.
|
Circulation Fault / Pump Blocked | View Details |
| F50 |
Boiler displays F50; may indicate a fan speed or air pressure switch fault on some Ferroli models.
|
Fan Speed / Air Pressure Fault | View Details |
| F51 |
Boiler shows F51; may be related to gas valve or modulation control issues.
|
Gas Valve Control Fault | View Details |
| F61 |
Boiler displays F61; often indicates a gas valve or safety shut-off fault on some Ferroli models.
|
Gas Valve Safety Fault | View Details |
| F62 |
Boiler shows F62; may indicate delayed ignition or gas valve closing fault.
|
Delayed Ignition / Gas Valve Closure Fault | View Details |
| – |
Boiler display is on but there is no heating and no hot water demand response; boiler does not attempt to fire.
|
No Demand Recognition / Control Fault | View Details |
| – |
Boiler does not start at all; no display or lights, completely dead.
|
No Power / Dead Boiler | View Details |
| – |
Boiler emits a burning smell or plastic smell during operation, with or without visible smoke, but no error code.
|
Overheating Component / Electrical Overheat | View Details |
| – |
Boiler frequently cycles on and off rapidly when heating is on, with radiators getting very hot then cooling quickly.
|
Short Cycling / Oversized Boiler or Control Issue | View Details |
| – |
Boiler frequently loses pressure and needs topping up every few days, with no specific error code until pressure becomes very low.
|
Chronic Pressure Loss | View Details |
| – |
Boiler leaking water from underneath the casing or from pipe connections, with no error code displayed.
|
Internal Water Leak | View Details |
| – |
Boiler makes loud banging or knocking noises (kettling) during operation, especially when heating is on, with no error code.
|
Kettling / Localised Boiling in Heat Exchanger | View Details |
| – |
Boiler or flue makes a loud whooshing or roaring noise when firing, with no error code.
|
Combustion Noise / Incorrect Gas-Air Ratio | View Details |
| – |
Boiler provides hot water but central heating does not work, with no error code.
|
No Central Heating / Diverter Valve Fault | View Details |
| – |
Boiler runs for central heating but does not provide hot water on a combi model, with no error code.
|
No DHW Production on Combi Boiler | View Details |
| – |
Boiler vibrates excessively or rattles during operation, with no error code.
|
Mechanical Vibration / Loose Components | View Details |
| – |
Domestic hot water temperature fluctuates between hot and cold during use on a combi boiler, with no error code.
|
Inconsistent DHW Temperature / Modulation Fault | View Details |
| – |
External condensate pipe drips constantly or backs up, sometimes causing boiler lockouts in cold weather, with no specific code.
|
Condensate Drain Blockage / Freezing | View Details |
| – |
Radiators only get warm at the bottom or some radiators stay cold while others heat up normally.
|
Poor Circulation / Sludge Build-up | View Details |
| – |
Water drips from the copper pressure relief valve discharge pipe outside, especially when the boiler is running.
|
Pressure Relief Valve Discharging | View Details |
No matching codes found
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