Ferroli
Ferroli Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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A01
Water heater does not ignite, burner does not light, display shows A01 shortly after a hot water demand.
Ignition Failure
A02
Burner lights but then shuts down quickly, display shows A02, sometimes accompanied by small popping noises.
Flame Detection Failure
A03
Unit locks out with A03, fan may start briefly then stop, no ignition attempt is heard.
Flue Gas Overheat / Safety Thermostat Tripped
A04
Display shows A04, burner does not start, fan may run continuously or not at all.
Flue Gas Sensor / NTC Fault
A05
Error A05 appears, unit attempts to start but shuts down, sometimes accompanied by fan operation anomalies.
Air Pressure Switch / Fan Fault
A06
Display shows A06, burner shuts down during operation, often after running for a short period.
Flow Temperature Overheat
A07
Error A07, unit may start and stop repeatedly, temperature fluctuates strongly.
Return Temperature Sensor Fault
A08
Display shows A08, unit may not respond to hot water demand or may shut down unexpectedly.
Flow Sensor / Turbine Fault
A09
Error A09 appears, unit may lock out during operation, sometimes after long runs at high temperature.
Flue Overtemperature / Safety Cut-out
A10
Display shows A10, unit does not start or stops shortly after ignition attempt.
Water Pressure / Flow Fault (for models with internal pump or pressure sensor)
A11
Error A11, unit may attempt ignition multiple times then lock out.
Gas Valve Control Fault
A12
Display shows A12, unit may run at reduced power or shut down intermittently.
Modulation / Gas Valve Feedback Fault
A13
Error A13, unit may not respond to user commands or may behave erratically.
Control Panel / Communication Fault
A14
Display shows A14, unit may lock out immediately at power-up.
Internal EEPROM / Configuration Error
F01
Error F01, water temperature reading is clearly wrong (e.g., shows very high or very low when water is lukewarm).
Domestic Hot Water NTC Sensor Fault
F02
F02 displayed, unit cycles rapidly, water temperature unstable.
Flow Sensor Signal Error
F03
F03 appears, burner shuts down, sometimes accompanied by very hot outlet water.
Overheat Thermostat Trip
F04
F04 displayed, fan may run but ignition does not proceed.
Fan Speed / Tachometer Fault
F05
F05 error, unit may start but then shut down with no obvious temperature issue.
Return NTC / Sensor Discrepancy
F06
F06 displayed, no response to hot water demand, sometimes after power surges.
PCB General Fault
F07
F07, unit may lock out with fan running continuously.
Air Pressure Switch Stuck / Incorrect State
F08
F08 displayed, unit may overheat or show unstable temperatures.
NTC Sensor Short Circuit
F09
F09, unit may not start or may shut down randomly.
NTC Sensor Open Circuit
F10
F10 displayed, water temperature overshoots setpoint, then unit locks out.
Overtemperature / Control Fault
Symptom
Buttons on the Ferroli control panel do not respond or respond intermittently.
Keypad / Control Input Failure
Symptom
Display is blank or segments missing, but heater still operates.
Display / User Interface Fault
Symptom
Hot water flow rate is very low compared to cold water taps.
Restricted Hot Water Flow
Symptom
Smell of burning plastic or electrical smell from the water heater.
Overheating Electrical Component
Symptom
Smell of gas near the water heater, especially during operation or shortly after.
Gas Leak / Combustion Seal Failure
Symptom
Water dripping from the flue terminal or condensate pipe outside.
Condensate Management Issue
Symptom
Water heater does not start at all, no lights or display, completely dead.
No Power / Supply Failure
Symptom
Water heater emits a whistling or high-pitched noise when running.
Resonance / Gas Flow Noise
Symptom
Water heater fan runs but there is no ignition and no error code for several seconds, then unit stops.
Ignition Sequence Interruption
Symptom
Water heater frequently cycles on and off with short run times, even with steady hot water demand.
Short Cycling
Symptom
Water heater frequently locks out and requires manual reset, but no consistent error code is shown.
Intermittent Safety Lockout
Symptom
Water heater ignites but hot water temperature is too low, even at maximum setting.
Insufficient Heating / Underfiring
Symptom
Water heater leaks water from the bottom of the casing.
Internal Water Leak
Symptom
Water heater makes loud banging or popping noises during operation.
Kettling / Boiling in Heat Exchanger
Symptom
Water heater powers on but does not ignite, no clicking sound, no fan operation, no error code displayed.
Control Board Standby / No Call for Heat
Symptom
Water heater produces water that is too hot, risk of scalding, temperature overshoots setpoint.
Overheating / Temperature Control Failure
Symptom
Water heater trips the household RCD or fuse when it starts.
Electrical Short / Earth Leakage
Symptom
Water heater vibrates excessively or rattles during operation.
Mechanical Vibration / Mounting Issue
Symptom
Water temperature fluctuates between hot and cold during a shower.
Temperature Instability / Cycling
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| A01 |
Water heater does not ignite, burner does not light, display shows A01 shortly after a hot water demand.
|
Ignition Failure | View Details |
| A02 |
Burner lights but then shuts down quickly, display shows A02, sometimes accompanied by small popping noises.
|
Flame Detection Failure | View Details |
| A03 |
Unit locks out with A03, fan may start briefly then stop, no ignition attempt is heard.
|
Flue Gas Overheat / Safety Thermostat Tripped | View Details |
| A04 |
Display shows A04, burner does not start, fan may run continuously or not at all.
|
Flue Gas Sensor / NTC Fault | View Details |
| A05 |
Error A05 appears, unit attempts to start but shuts down, sometimes accompanied by fan operation anomalies.
|
Air Pressure Switch / Fan Fault | View Details |
| A06 |
Display shows A06, burner shuts down during operation, often after running for a short period.
|
Flow Temperature Overheat | View Details |
| A07 |
Error A07, unit may start and stop repeatedly, temperature fluctuates strongly.
|
Return Temperature Sensor Fault | View Details |
| A08 |
Display shows A08, unit may not respond to hot water demand or may shut down unexpectedly.
|
Flow Sensor / Turbine Fault | View Details |
| A09 |
Error A09 appears, unit may lock out during operation, sometimes after long runs at high temperature.
|
Flue Overtemperature / Safety Cut-out | View Details |
| A10 |
Display shows A10, unit does not start or stops shortly after ignition attempt.
|
Water Pressure / Flow Fault (for models with internal pump or pressure sensor) | View Details |
| A11 |
Error A11, unit may attempt ignition multiple times then lock out.
|
Gas Valve Control Fault | View Details |
| A12 |
Display shows A12, unit may run at reduced power or shut down intermittently.
|
Modulation / Gas Valve Feedback Fault | View Details |
| A13 |
Error A13, unit may not respond to user commands or may behave erratically.
|
Control Panel / Communication Fault | View Details |
| A14 |
Display shows A14, unit may lock out immediately at power-up.
|
Internal EEPROM / Configuration Error | View Details |
| F01 |
Error F01, water temperature reading is clearly wrong (e.g., shows very high or very low when water is lukewarm).
|
Domestic Hot Water NTC Sensor Fault | View Details |
| F02 |
F02 displayed, unit cycles rapidly, water temperature unstable.
|
Flow Sensor Signal Error | View Details |
| F03 |
F03 appears, burner shuts down, sometimes accompanied by very hot outlet water.
|
Overheat Thermostat Trip | View Details |
| F04 |
F04 displayed, fan may run but ignition does not proceed.
|
Fan Speed / Tachometer Fault | View Details |
| F05 |
F05 error, unit may start but then shut down with no obvious temperature issue.
|
Return NTC / Sensor Discrepancy | View Details |
| F06 |
F06 displayed, no response to hot water demand, sometimes after power surges.
|
PCB General Fault | View Details |
| F07 |
F07, unit may lock out with fan running continuously.
|
Air Pressure Switch Stuck / Incorrect State | View Details |
| F08 |
F08 displayed, unit may overheat or show unstable temperatures.
|
NTC Sensor Short Circuit | View Details |
| F09 |
F09, unit may not start or may shut down randomly.
|
NTC Sensor Open Circuit | View Details |
| F10 |
F10 displayed, water temperature overshoots setpoint, then unit locks out.
|
Overtemperature / Control Fault | View Details |
| – |
Buttons on the Ferroli control panel do not respond or respond intermittently.
|
Keypad / Control Input Failure | View Details |
| – |
Display is blank or segments missing, but heater still operates.
|
Display / User Interface Fault | View Details |
| – |
Hot water flow rate is very low compared to cold water taps.
|
Restricted Hot Water Flow | View Details |
| – |
Smell of burning plastic or electrical smell from the water heater.
|
Overheating Electrical Component | View Details |
| – |
Smell of gas near the water heater, especially during operation or shortly after.
|
Gas Leak / Combustion Seal Failure | View Details |
| – |
Water dripping from the flue terminal or condensate pipe outside.
|
Condensate Management Issue | View Details |
| – |
Water heater does not start at all, no lights or display, completely dead.
|
No Power / Supply Failure | View Details |
| – |
Water heater emits a whistling or high-pitched noise when running.
|
Resonance / Gas Flow Noise | View Details |
| – |
Water heater fan runs but there is no ignition and no error code for several seconds, then unit stops.
|
Ignition Sequence Interruption | View Details |
| – |
Water heater frequently cycles on and off with short run times, even with steady hot water demand.
|
Short Cycling | View Details |
| – |
Water heater frequently locks out and requires manual reset, but no consistent error code is shown.
|
Intermittent Safety Lockout | View Details |
| – |
Water heater ignites but hot water temperature is too low, even at maximum setting.
|
Insufficient Heating / Underfiring | View Details |
| – |
Water heater leaks water from the bottom of the casing.
|
Internal Water Leak | View Details |
| – |
Water heater makes loud banging or popping noises during operation.
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
Water heater powers on but does not ignite, no clicking sound, no fan operation, no error code displayed.
|
Control Board Standby / No Call for Heat | View Details |
| – |
Water heater produces water that is too hot, risk of scalding, temperature overshoots setpoint.
|
Overheating / Temperature Control Failure | View Details |
| – |
Water heater trips the household RCD or fuse when it starts.
|
Electrical Short / Earth Leakage | View Details |
| – |
Water heater vibrates excessively or rattles during operation.
|
Mechanical Vibration / Mounting Issue | View Details |
| – |
Water temperature fluctuates between hot and cold during a shower.
|
Temperature Instability / Cycling | View Details |
No matching codes found
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