F
Ferroli Fault Codes
Select a fault code to see its meaning, common causes and how to fix it.
- A01 The A01 code appears when your Ferroli boiler has attempted to light the burner but failed to establish a flame. As a… Read more →
- A02 The A02 code is a hard lockout fault on Ferroli boilers, meaning the boiler has shut itself down and will not restart… Read more →
- A03 The A03 code means your Ferroli boiler has detected that water temperature has risen beyond safe limits, most likely… Read more →
- A04 The A04 is a lockout fault on Ferroli boilers, meaning the boiler has shut itself down and will not restart until you… Read more →
- A05 The A05 code on a Ferroli boiler signals a problem with the flue exhaust fan — specifically, the boiler's control board… Read more →
- A06 The A06 code indicates that the boiler's flame detection system has lost the burner flame after ignition — and has done… Read more →
- A07 The A07 code appears when the flue gas probe detects an excessively high temperature — typically sustained for more… Read more →
- A08 The A08 code means your Ferroli boiler has detected overheating at the heat exchanger and has locked itself out as a… Read more →
- A09 The A09 code on a Ferroli boiler is a lockout fault — meaning the boiler shuts down completely and requires a manual… Read more →
- A10 The Ferroli A10 code is very likely what you are reading as A01 — Ferroli displays use a letter followed by two digits,… Read more →
- A11 The A11 code on a Ferroli boiler indicates a fault with the return NTC thermistor — the temperature sensor that… Read more →
- A13 The A13 code indicates that the flue probe (also called the exchange or flue gas sensor) has either failed or is… Read more →
- A14 The A14 code appears on Ferroli boilers when the flue extraction duct safety device has been triggered as a result of… Read more →
- A15 The A15 code is a manual-reset lockout that appears when your Ferroli boiler has triggered the F05 blocking fault five… Read more →
- A16 The A16 code on a Ferroli boiler indicates a gas valve fault — specifically, the control board (PCB) has lost… Read more →
- A21 The A21 is a lockout fault on Ferroli boilers, meaning the appliance has shut itself down completely and will not… Read more →
- A23 The Ferroli A23 code has two distinct meanings depending on which model you own. On the DOMIcondens HE 26C and Optimax… Read more →
- A24 The A24 fault code on a Ferroli boiler indicates a card parameter error — meaning the boiler's control board (PCB) has… Read more →
- A26 The A26 code is a manual-lockout fault — the 'A' prefix on any Ferroli fault code means the boiler has shut itself down… Read more →
- A34 The A34 fault code appears on Ferroli boilers when the control board detects that the incoming mains electrical supply… Read more →
- A35 The A35 code appears on Ferroli boilers — including the Optimax HE Plus 31C and 38C and the DOMIcondens HE 26C — when… Read more →
- A37 The A37 fault code indicates that your Ferroli boiler's pressure sensor has detected the central heating system… Read more →
- A39 The A39 code indicates that the boiler has detected a problem with the external (outside air temperature) probe — an… Read more →
- A41 The A41 code is a manual lockout fault on Ferroli boilers — meaning the boiler shuts itself down and will not restart… Read more →
- A42 The A42 code means the boiler's flow (heating) sensor has failed or is producing readings that fall outside the… Read more →
- A43 The A43 fault code indicates that your Ferroli boiler has triggered its heat exchanger protection function. In plain… Read more →
- A50 The A50 code is a lockout fault on Ferroli boilers — most notably the DOMIcondens HE 26 C — indicating that the… Read more →
- A51 The A51 code indicates that your Ferroli boiler has detected a poor combustion condition — in plain terms, either the… Read more →
- A54 The A54 fault code on Ferroli boilers indicates an internal fault with the PCB AGC01 — the main control board that acts… Read more →
- A55 The A55 code is a hard lockout fault on Ferroli boilers pointing specifically to a problem with the AGC01 control board… Read more →
- A56 The A56 fault code on a Ferroli boiler signals a calibration error — specifically that the boiler's calibration… Read more →
- A61 The A61 is a lockout fault on Ferroli boilers — codes starting with 'A' always require a manual reset to clear, unlike… Read more →
- A62 The A62 code signals that the boiler's control board (PCB) has lost communication with the gas valve and can no longer… Read more →
- A63 The A63 fault code on a Ferroli boiler signals an internal electronics fault with the boiler's main control board… Read more →
- A64 The A64 code is a secondary lockout that appears when a Ferroli boiler has been manually reset too many times in… Read more →
- A68 The A68 code is a manual lockout fault on Ferroli boilers, meaning the boiler has shut itself down and will not restart… Read more →
- F04 The F04 code on a Ferroli boiler is a safety lockout that points to one of two related problems, depending on your… Read more →
- F05 The F05 code on a Ferroli boiler indicates that the air pressure switch (APS) is not detecting the correct conditions… Read more →
- F07 The F07 code is a blocking fault on Ferroli boilers, meaning the boiler pauses operation but may recover automatically… Read more →
- F08 The F08 code on a Ferroli boiler means the overtemperature protection circuit has triggered because the heating water… Read more →
- F09 The F09 code on a Ferroli boiler signals that the overtemperature protection circuit has been triggered in connection… Read more →
- F10 The F10 code on a Ferroli boiler indicates a fault with the central heating flow temperature sensor (also referred to… Read more →
- F11 The F11 code on a Ferroli boiler signals a problem with the domestic hot water (DHW) NTC temperature sensor — the… Read more →
- F12 The F12 code on a Ferroli boiler indicates a problem with the boiler compartment temperature sensor — typically an NTC… Read more →
- F13 The F13 code on a Ferroli boiler indicates a problem with the heat exchanger NTC (Negative Temperature Coefficient)… Read more →
- F14 The F14 code on Ferroli boilers signals a problem with the heating circuit's secondary NTC temperature sensor — either… Read more →
- F15 The F15 code on a Ferroli boiler most commonly points to a fan-related problem — typically an interrupted tachometer… Read more →
- F20 The F20 fault code appears on certain Ferroli boiler models — most notably the Domiproject D/F range and the… Read more →
- F21 The F21 code on a Ferroli boiler is a blocking fault — meaning the boiler shuts down but may recover automatically once… Read more →
- F34 The F34 code on a Ferroli boiler has two distinct meanings depending on the model. On most current Ferroli boilers, F34… Read more →
- F35 The F35 code on a Ferroli boiler indicates that the boiler's control board has detected an irregular or unstable mains… Read more →
- F37 The F37 code appears when the boiler's water pressure sensor detects that system pressure has dropped to around 0.4 bar… Read more →
- F39 The F39 code on Ferroli boilers has two distinct meanings depending on the specific model. On most Ferroli boilers, F39… Read more →
- F40 The F40 code on Ferroli boilers most commonly indicates that the system water pressure is incorrect — in most cases too… Read more →
- F41 The F41 code appears when your Ferroli boiler's safety system detects that the temperature difference (often called… Read more →
- F42 The F42 code appears when the Ferroli boiler's control board detects an abnormal or implausible reading from one or… Read more →
- F43 The F43 code means the boiler has triggered its heat exchanger protection function. In plain terms, the boiler has… Read more →
- F47 The F47 code on a Ferroli boiler points to one of two underlying problems depending on which model range you own. On… Read more →
- F50 The F50 code appears on Ferroli boilers when the control board (PCB) detects a problem with the gas valve modulation… Read more →
- F51 The F51 code signals that the boiler's control board (PCB) has detected an internal fault within its own controller —… Read more →
- F52 The F52 code is a blocking fault on Ferroli boilers, meaning the boiler has suspended operation but may recover once… Read more →
- F53 The F53 code on a Ferroli boiler signals that the control board (PCB) has detected one or more of its internal… Read more →
- F56 The F56 and A56 codes on a Ferroli boiler both relate to a calibration error — specifically, the boiler's internal… Read more →
- F61 The F61 code (sometimes displayed as A61 on certain Ferroli models) points to an internal error on the boiler's AGC01… Read more →
- F66 The F66 code on a Ferroli boiler indicates that the boiler's firmware has not loaded successfully. In plain terms, the… Read more →
- F67 The F67 code on a Ferroli boiler indicates that a Boiler Chip Card (BCC) service key is detected as connected to the… Read more →
- F68 The F68 fault code (and its lockout variant A68) indicates that the boiler's control board has failed to read or load… Read more →