Ferroli
Ferroli Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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A01
Ferroli furnace fails to ignite, burner does not light, display shows A01 shortly after a call for heat.
Ignition Failure / Flame Not Detected
A02
Ferroli furnace locks out with A02, fan runs but burner shuts down shortly after ignition attempt.
Flame Signal Lost During Operation
A03
Ferroli furnace stops and displays A03, often after running for some time; unit may feel very hot.
Overheat Thermostat Tripped
A04
Display shows A04 and the Ferroli furnace will not start; may occur after power interruptions.
Insufficient System Water Pressure / Low Pressure Lockout
A05
Ferroli furnace shows A05 and shuts down; fan may run briefly then stop.
Flue Gas Overheat / Flue Thermostat Intervention
A06
Display shows A06; ignition attempts may be noisy or irregular, with delayed flame establishment.
Ignition Lockout / Repeated Failed Ignitions
A07
Ferroli furnace displays A07 and will not fire; may occur intermittently during operation.
Flow Temperature Sensor (NTC) Fault
A08
Display shows A08; unit may run briefly then shut down, or may not start at all.
Return Temperature Sensor (NTC) Fault
A09
Ferroli furnace shows A09; may be associated with rapid cycling or incorrect temperature readings.
Domestic Hot Water (DHW) NTC Sensor Fault (on combi-style furnace/boiler units)
A10
Display shows A10; Ferroli furnace may not respond to thermostat or may behave erratically.
External Thermostat / Room Control Fault
A11
Ferroli furnace displays A11 and does not start; fan may not run.
Fan / Air Pressure Switch Fault
A12
Display shows A12; unit may start then quickly shut down, often with fan running at high speed.
Flue Gas Sensor / Safety Device Intervention
A21
Ferroli furnace shows A21; may be associated with incorrect fan speed or noisy operation.
Fan Speed Control / Tachometer Fault
A41
Display shows A41; unit may not respond correctly to temperature changes.
Flow/Return NTC Mismatch or Calibration Error
A51
Ferroli furnace displays A51; may occur during DHW demand on combi-style units.
DHW Flow Sensor / Turbine Fault
F01
Ferroli furnace shows F01; unit is unresponsive or stuck in standby.
Main Control Board Communication Fault
F02
Display shows F02; may be associated with erratic display or control issues.
User Interface / Display Board Fault
F10
Ferroli furnace shows F10; may not respond to external controls.
Communication Error with Remote Control / Bus
F20
Display shows F20; unit may shut down unexpectedly during operation.
Internal Overtemperature / Safety Cut-out
F37
Ferroli furnace shows F37; pressure reading on display may be abnormal or fluctuating.
Water Pressure Sensor Signal Error
F40
Display shows F40; unit may not start or may shut down shortly after starting.
Gas Valve Control Fault
F41
Ferroli furnace shows F41; ignition may be erratic or absent.
Ignition Control / Flame Detection Circuit Fault
F42
Display shows F42; may be associated with incorrect temperature readings or rapid cycling.
NTC Sensor Short Circuit
F43
Ferroli furnace shows F43; unit may not start or may shut down quickly.
NTC Sensor Open Circuit
F50
Display shows F50; fan may run at incorrect speed or not at all.
Fan Power Supply / Modulation Fault
F60
Ferroli furnace shows F60; gas valve may not open correctly.
Gas Valve Modulation / Control Error
F70
Display shows F70; may occur after PCB replacement or firmware update.
Configuration / Parameter Error
Symptom
Condensate water backing up or dripping from inside the Ferroli condensing furnace.
Blocked Condensate Trap or Drain
Symptom
Ferroli furnace causes frequent tripping of the household RCD or circuit breaker.
Electrical Short or Earth Leakage
Symptom
Ferroli furnace does not respond to room thermostat changes; temperature overshoots or undershoots.
Control / Thermostat Misoperation
Symptom
Ferroli furnace emits a burning smell or plastic smell when running.
Overheating Electrical or Plastic Components
Symptom
Ferroli furnace fan runs continuously even when there is no call for heat.
Fan Stuck On / Post-Purge Fault
Symptom
Ferroli furnace frequently loses pressure and needs regular topping up.
Chronic Pressure Loss
Symptom
Ferroli furnace ignites with a loud bang or pop (delayed ignition).
Delayed Gas Ignition
Symptom
Ferroli furnace leaking water from the bottom of the casing or from pipe connections.
Internal Water Leak
Symptom
Ferroli furnace produces a whistling or high-pitched noise during operation.
Gas Flow or Airflow Resonance
Symptom
Ferroli furnace runs but radiators or warm air outlets remain lukewarm or cold.
Insufficient Heat Output
Symptom
Ferroli furnace shows corrosion or rust marks around the flue connection or top of the casing.
Flue Gas Leakage / Condensate Corrosion
Symptom
Ferroli furnace starts then shuts down after a few seconds without showing a specific error code.
Short Cycling / Premature Shutdown
Symptom
Ferroli furnace will not start at all; display is blank or completely dead.
No Power / Dead Appliance
Symptom
Loud banging or knocking noises from Ferroli furnace when starting or stopping heating.
Kettling / Hydraulic Shock
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| A01 |
Ferroli furnace fails to ignite, burner does not light, display shows A01 shortly after a call for heat.
|
Ignition Failure / Flame Not Detected | View Details |
| A02 |
Ferroli furnace locks out with A02, fan runs but burner shuts down shortly after ignition attempt.
|
Flame Signal Lost During Operation | View Details |
| A03 |
Ferroli furnace stops and displays A03, often after running for some time; unit may feel very hot.
|
Overheat Thermostat Tripped | View Details |
| A04 |
Display shows A04 and the Ferroli furnace will not start; may occur after power interruptions.
|
Insufficient System Water Pressure / Low Pressure Lockout | View Details |
| A05 |
Ferroli furnace shows A05 and shuts down; fan may run briefly then stop.
|
Flue Gas Overheat / Flue Thermostat Intervention | View Details |
| A06 |
Display shows A06; ignition attempts may be noisy or irregular, with delayed flame establishment.
|
Ignition Lockout / Repeated Failed Ignitions | View Details |
| A07 |
Ferroli furnace displays A07 and will not fire; may occur intermittently during operation.
|
Flow Temperature Sensor (NTC) Fault | View Details |
| A08 |
Display shows A08; unit may run briefly then shut down, or may not start at all.
|
Return Temperature Sensor (NTC) Fault | View Details |
| A09 |
Ferroli furnace shows A09; may be associated with rapid cycling or incorrect temperature readings.
|
Domestic Hot Water (DHW) NTC Sensor Fault (on combi-style furnace/boiler units) | View Details |
| A10 |
Display shows A10; Ferroli furnace may not respond to thermostat or may behave erratically.
|
External Thermostat / Room Control Fault | View Details |
| A11 |
Ferroli furnace displays A11 and does not start; fan may not run.
|
Fan / Air Pressure Switch Fault | View Details |
| A12 |
Display shows A12; unit may start then quickly shut down, often with fan running at high speed.
|
Flue Gas Sensor / Safety Device Intervention | View Details |
| A21 |
Ferroli furnace shows A21; may be associated with incorrect fan speed or noisy operation.
|
Fan Speed Control / Tachometer Fault | View Details |
| A41 |
Display shows A41; unit may not respond correctly to temperature changes.
|
Flow/Return NTC Mismatch or Calibration Error | View Details |
| A51 |
Ferroli furnace displays A51; may occur during DHW demand on combi-style units.
|
DHW Flow Sensor / Turbine Fault | View Details |
| F01 |
Ferroli furnace shows F01; unit is unresponsive or stuck in standby.
|
Main Control Board Communication Fault | View Details |
| F02 |
Display shows F02; may be associated with erratic display or control issues.
|
User Interface / Display Board Fault | View Details |
| F10 |
Ferroli furnace shows F10; may not respond to external controls.
|
Communication Error with Remote Control / Bus | View Details |
| F20 |
Display shows F20; unit may shut down unexpectedly during operation.
|
Internal Overtemperature / Safety Cut-out | View Details |
| F37 |
Ferroli furnace shows F37; pressure reading on display may be abnormal or fluctuating.
|
Water Pressure Sensor Signal Error | View Details |
| F40 |
Display shows F40; unit may not start or may shut down shortly after starting.
|
Gas Valve Control Fault | View Details |
| F41 |
Ferroli furnace shows F41; ignition may be erratic or absent.
|
Ignition Control / Flame Detection Circuit Fault | View Details |
| F42 |
Display shows F42; may be associated with incorrect temperature readings or rapid cycling.
|
NTC Sensor Short Circuit | View Details |
| F43 |
Ferroli furnace shows F43; unit may not start or may shut down quickly.
|
NTC Sensor Open Circuit | View Details |
| F50 |
Display shows F50; fan may run at incorrect speed or not at all.
|
Fan Power Supply / Modulation Fault | View Details |
| F60 |
Ferroli furnace shows F60; gas valve may not open correctly.
|
Gas Valve Modulation / Control Error | View Details |
| F70 |
Display shows F70; may occur after PCB replacement or firmware update.
|
Configuration / Parameter Error | View Details |
| – |
Condensate water backing up or dripping from inside the Ferroli condensing furnace.
|
Blocked Condensate Trap or Drain | View Details |
| – |
Ferroli furnace causes frequent tripping of the household RCD or circuit breaker.
|
Electrical Short or Earth Leakage | View Details |
| – |
Ferroli furnace does not respond to room thermostat changes; temperature overshoots or undershoots.
|
Control / Thermostat Misoperation | View Details |
| – |
Ferroli furnace emits a burning smell or plastic smell when running.
|
Overheating Electrical or Plastic Components | View Details |
| – |
Ferroli furnace fan runs continuously even when there is no call for heat.
|
Fan Stuck On / Post-Purge Fault | View Details |
| – |
Ferroli furnace frequently loses pressure and needs regular topping up.
|
Chronic Pressure Loss | View Details |
| – |
Ferroli furnace ignites with a loud bang or pop (delayed ignition).
|
Delayed Gas Ignition | View Details |
| – |
Ferroli furnace leaking water from the bottom of the casing or from pipe connections.
|
Internal Water Leak | View Details |
| – |
Ferroli furnace produces a whistling or high-pitched noise during operation.
|
Gas Flow or Airflow Resonance | View Details |
| – |
Ferroli furnace runs but radiators or warm air outlets remain lukewarm or cold.
|
Insufficient Heat Output | View Details |
| – |
Ferroli furnace shows corrosion or rust marks around the flue connection or top of the casing.
|
Flue Gas Leakage / Condensate Corrosion | View Details |
| – |
Ferroli furnace starts then shuts down after a few seconds without showing a specific error code.
|
Short Cycling / Premature Shutdown | View Details |
| – |
Ferroli furnace will not start at all; display is blank or completely dead.
|
No Power / Dead Appliance | View Details |
| – |
Loud banging or knocking noises from Ferroli furnace when starting or stopping heating.
|
Kettling / Hydraulic Shock | View Details |
No matching codes found
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