Ferroli
Ferroli Smart Thermostats Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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A01
Thermostat display shows A01 and boiler does not ignite when there is a call for heat.
Ignition Failure Lockout (Boiler Communication)
A02
Thermostat indicates A02 and heating stops; boiler status shows overheat or safety shutdown.
Boiler Overheat / Safety Lockout Feedback
A03
Thermostat shows A03 and heating is disabled; boiler indicates flue or safety sensor trip.
Flue / Safety Device Trip Feedback
F01
Ferroli smart thermostat displays F01 and stops controlling heating; screen may still be on.
Internal Temperature Sensor Fault (Room NTC Open/Short)
F02
Thermostat shows F02 and ignores temperature changes; may default to frost protection mode.
External Sensor Fault (Remote NTC Open/Short)
F03
Thermostat intermittently shows F03 and loses connection to the boiler; heating stops unexpectedly.
OpenTherm / BUS Communication Fault
F04
Thermostat shows F04 and cannot control domestic hot water temperature via the boiler.
DHW Sensor / Modulation Communication Error
F05
Thermostat displays F05 and the screen backlight flickers or unit reboots randomly.
Power Supply / Low Voltage Fault
F06
Thermostat shows F06 and cannot detect the boiler; heating and DHW control are disabled.
Boiler Not Detected / No Response on BUS
F07
Thermostat displays F07 and the wireless icon flashes; heating does not respond to setpoint changes.
Wireless Signal Loss Between Room Unit and Receiver
F08
Thermostat shows F08 and cannot connect to the home Wi‑Fi network; app control is unavailable.
Wi‑Fi Connectivity Failure
F09
Thermostat shows F09 and the mobile app cannot access the device remotely, even though local control works.
Cloud / Server Communication Error
F10
Thermostat displays F10 and the date/time resets after every power loss; schedules are lost.
Real‑Time Clock / Backup Power Failure
F11
Thermostat shows F11 and cannot switch the boiler on even though it sends a heat demand.
Relay Output Fault / Stuck or Burnt Contacts
F12
Thermostat shows F12 and the display is unreadable or segments are missing.
Display / LCD Module Fault
F13
Thermostat shows F13 and buttons or touchscreen do not respond correctly.
User Interface / Keypad Fault
F14
Thermostat shows F14 and cannot complete pairing with the Ferroli mobile app via Bluetooth or Wi‑Fi setup mode.
Local Commissioning / Pairing Failure
F15
Thermostat shows F15 and the heating curve or weather compensation does not function correctly.
Weather Compensation / Outdoor Sensor Communication Error
F16
Thermostat shows F16 and the heating schedule cannot be saved or is lost after reboot.
Non‑Volatile Memory (EEPROM/Flash) Error
F17
Thermostat shows F17 and the boiler runs at maximum temperature regardless of setpoint.
Modulation Control Fault / Stuck Demand Signal
F18
Thermostat shows F18 and underfloor heating zone valves do not open when there is demand.
Zone Control Output Fault
F19
Thermostat shows F19 and the boiler cycles rapidly on and off, ignoring anti‑short‑cycle settings.
Anti‑Short‑Cycle / Hysteresis Configuration Error
F20
Thermostat shows F20 and the frost protection function cannot be enabled or is malfunctioning.
Frost Protection Logic / Sensor Fault
Symptom
Boiler runs continuously even when the thermostat setpoint is reached; rooms overheat.
Thermostat Stuck ON / Demand Not Removed
Symptom
Room temperature overshoots setpoint by several degrees; rooms become too hot before boiler switches off.
Poor Thermostat Placement / Thermal Lag
Symptom
Thermostat app schedules do not match what the thermostat actually follows; times appear shifted.
Time Zone / Clock Synchronization Issue
Symptom
Thermostat backlight is on but screen is very dim or unreadable in normal lighting.
Backlight / LCD Contrast Degradation
Symptom
Thermostat batteries drain very quickly (within weeks) on a battery‑powered Ferroli room unit.
Excessive Power Consumption / RF Retries
Symptom
Thermostat display is completely blank; no LEDs on receiver; system appears dead.
No Power to Thermostat / Receiver
Symptom
Thermostat does not call for heat; boiler remains off even when room is cold and setpoint is high.
No Heat Demand from Thermostat
Symptom
Thermostat fails to control multiple heating zones correctly; some zones heat when they should be off.
Cross‑Wiring / Zone Valve Backfeed
Symptom
Thermostat frequently loses time or resets after short power cuts; schedules become unreliable.
Unstable Power Supply to Thermostat
Symptom
Thermostat makes a constant buzzing or humming noise from the receiver when calling for heat.
Noisy Relay / Coil Vibration
Symptom
Thermostat plastic housing becomes noticeably warm to the touch during normal operation.
Overheating of Internal Electronics
Symptom
Thermostat shows correct room temperature but boiler flow temperature is much higher than expected for weather conditions.
Weather Compensation Misconfiguration
Symptom
Thermostat shows large temperature swings; room feels alternately too hot and too cold.
Incorrect Control Algorithm / PID Settings
Symptom
Thermostat shows Wi‑Fi connected but the Ferroli app reports the device as offline.
Local Network / IP Address Conflict
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| A01 |
Thermostat display shows A01 and boiler does not ignite when there is a call for heat.
|
Ignition Failure Lockout (Boiler Communication) | View Details |
| A02 |
Thermostat indicates A02 and heating stops; boiler status shows overheat or safety shutdown.
|
Boiler Overheat / Safety Lockout Feedback | View Details |
| A03 |
Thermostat shows A03 and heating is disabled; boiler indicates flue or safety sensor trip.
|
Flue / Safety Device Trip Feedback | View Details |
| F01 |
Ferroli smart thermostat displays F01 and stops controlling heating; screen may still be on.
|
Internal Temperature Sensor Fault (Room NTC Open/Short) | View Details |
| F02 |
Thermostat shows F02 and ignores temperature changes; may default to frost protection mode.
|
External Sensor Fault (Remote NTC Open/Short) | View Details |
| F03 |
Thermostat intermittently shows F03 and loses connection to the boiler; heating stops unexpectedly.
|
OpenTherm / BUS Communication Fault | View Details |
| F04 |
Thermostat shows F04 and cannot control domestic hot water temperature via the boiler.
|
DHW Sensor / Modulation Communication Error | View Details |
| F05 |
Thermostat displays F05 and the screen backlight flickers or unit reboots randomly.
|
Power Supply / Low Voltage Fault | View Details |
| F06 |
Thermostat shows F06 and cannot detect the boiler; heating and DHW control are disabled.
|
Boiler Not Detected / No Response on BUS | View Details |
| F07 |
Thermostat displays F07 and the wireless icon flashes; heating does not respond to setpoint changes.
|
Wireless Signal Loss Between Room Unit and Receiver | View Details |
| F08 |
Thermostat shows F08 and cannot connect to the home Wi‑Fi network; app control is unavailable.
|
Wi‑Fi Connectivity Failure | View Details |
| F09 |
Thermostat shows F09 and the mobile app cannot access the device remotely, even though local control works.
|
Cloud / Server Communication Error | View Details |
| F10 |
Thermostat displays F10 and the date/time resets after every power loss; schedules are lost.
|
Real‑Time Clock / Backup Power Failure | View Details |
| F11 |
Thermostat shows F11 and cannot switch the boiler on even though it sends a heat demand.
|
Relay Output Fault / Stuck or Burnt Contacts | View Details |
| F12 |
Thermostat shows F12 and the display is unreadable or segments are missing.
|
Display / LCD Module Fault | View Details |
| F13 |
Thermostat shows F13 and buttons or touchscreen do not respond correctly.
|
User Interface / Keypad Fault | View Details |
| F14 |
Thermostat shows F14 and cannot complete pairing with the Ferroli mobile app via Bluetooth or Wi‑Fi setup mode.
|
Local Commissioning / Pairing Failure | View Details |
| F15 |
Thermostat shows F15 and the heating curve or weather compensation does not function correctly.
|
Weather Compensation / Outdoor Sensor Communication Error | View Details |
| F16 |
Thermostat shows F16 and the heating schedule cannot be saved or is lost after reboot.
|
Non‑Volatile Memory (EEPROM/Flash) Error | View Details |
| F17 |
Thermostat shows F17 and the boiler runs at maximum temperature regardless of setpoint.
|
Modulation Control Fault / Stuck Demand Signal | View Details |
| F18 |
Thermostat shows F18 and underfloor heating zone valves do not open when there is demand.
|
Zone Control Output Fault | View Details |
| F19 |
Thermostat shows F19 and the boiler cycles rapidly on and off, ignoring anti‑short‑cycle settings.
|
Anti‑Short‑Cycle / Hysteresis Configuration Error | View Details |
| F20 |
Thermostat shows F20 and the frost protection function cannot be enabled or is malfunctioning.
|
Frost Protection Logic / Sensor Fault | View Details |
| – |
Boiler runs continuously even when the thermostat setpoint is reached; rooms overheat.
|
Thermostat Stuck ON / Demand Not Removed | View Details |
| – |
Room temperature overshoots setpoint by several degrees; rooms become too hot before boiler switches off.
|
Poor Thermostat Placement / Thermal Lag | View Details |
| – |
Thermostat app schedules do not match what the thermostat actually follows; times appear shifted.
|
Time Zone / Clock Synchronization Issue | View Details |
| – |
Thermostat backlight is on but screen is very dim or unreadable in normal lighting.
|
Backlight / LCD Contrast Degradation | View Details |
| – |
Thermostat batteries drain very quickly (within weeks) on a battery‑powered Ferroli room unit.
|
Excessive Power Consumption / RF Retries | View Details |
| – |
Thermostat display is completely blank; no LEDs on receiver; system appears dead.
|
No Power to Thermostat / Receiver | View Details |
| – |
Thermostat does not call for heat; boiler remains off even when room is cold and setpoint is high.
|
No Heat Demand from Thermostat | View Details |
| – |
Thermostat fails to control multiple heating zones correctly; some zones heat when they should be off.
|
Cross‑Wiring / Zone Valve Backfeed | View Details |
| – |
Thermostat frequently loses time or resets after short power cuts; schedules become unreliable.
|
Unstable Power Supply to Thermostat | View Details |
| – |
Thermostat makes a constant buzzing or humming noise from the receiver when calling for heat.
|
Noisy Relay / Coil Vibration | View Details |
| – |
Thermostat plastic housing becomes noticeably warm to the touch during normal operation.
|
Overheating of Internal Electronics | View Details |
| – |
Thermostat shows correct room temperature but boiler flow temperature is much higher than expected for weather conditions.
|
Weather Compensation Misconfiguration | View Details |
| – |
Thermostat shows large temperature swings; room feels alternately too hot and too cold.
|
Incorrect Control Algorithm / PID Settings | View Details |
| – |
Thermostat shows Wi‑Fi connected but the Ferroli app reports the device as offline.
|
Local Network / IP Address Conflict | View Details |
No matching codes found
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