BoilerFaultCodes
The most common Ferroli faults
Your boiler has failed to light the flame, which means you currently have no heating or hot water.
Why it happens: This fault occurs when the boiler's control system attempts to light the burner but fails to detect a steady flame after several tries. The most common reasons include a worn-out ignition spark electrode that can no longer create a spark, or a gas valve that isn't opening correctly to allow fuel into the burner.
Check if other gas appliances in your home, like a hob, are working to ensure gas is reaching the property.Verify that your gas prepaid meter has credit, if applicable.Press the 'Reset' button on the boiler control panel once to see if the system restarts.
Your boiler has likely overheated because the water isn't moving through the system properly or a safety sensor has detected a temperature that is too high.
Why it happens: This fault occurs when the water inside the boiler exceeds a safe temperature, triggering a safety shutdown. The most common reasons are a pump failure that prevents water from moving, or a buildup of debris and sludge that blocks the heat exchanger.
Check that your radiator valves and isolation valves are fully openEnsure your system pressure is topped up to between 1 and 1.5 barPress the Reset button on the control panel to see if the fault clears
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Why it happens: This fault occurs when the internal water pressure drops below the minimum level required for the boiler to fire up safely. The most common reason is a slow leak somewhere in your radiator network or a faulty expansion vessel that can no longer manage the system's pressure. It can also happen if you have recently bled your radiators and haven't topped the water level back up.
Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.Slowly open the one or two small valves on the filling loop to allow water into the system.Watch the pressure gauge and close the valves tightly once the needle reaches between 1.0 and 1.5 bar.
Your boiler has stopped working because water is not moving through it properly or there is trapped air causing it to overheat.
Why it happens: This fault occurs when the boiler detects that heat is not being carried away from the heat exchanger fast enough, causing it to reach a dangerously high temperature. The most common reasons are a failed pump that isn't pushing water around, or a buildup of air and sludge that is blocking the flow within the pipes.
Check that your system pressure is between 1 and 1.5 bar on the pressure gaugeBleed all radiators in your home to remove trapped airEnsure all radiator valves and external isolation valves are fully open
Your boiler thinks it sees a flame even though it hasn't started the burner yet, which is a safety conflict that prevents it from running.
Why it happens: This fault occurs when the boiler's internal sensor detects an electrical signal mimicking a flame before the heating cycle has actually started. This is usually caused by a carbon-coated or damaged electrode sending a 'false' signal, or moisture and debris on the burner assembly interfering with the detection system.
Full guide for Modena HE A02Your boiler has shut down because it detected a repeat issue with its exhaust system three times in one day.
Why it happens: This fault occurs when the boiler's safety sensors detect that exhaust fumes are not being cleared away correctly through the flue pipe. It is triggered after the system identifies a recurring airflow issue several times in a single day, causing the boiler to shut down for safety. Common reasons include a failing fan, a blocked flue, or a faulty pressure switch that can no longer accurately monitor the flow of gases.
Full guide for Modena HE A04Your boiler has stopped working because its internal fan, which safely exhausts gases, is not communicating correctly with the main control board.
Why it happens: This fault occurs when the boiler's control board loses track of how fast the fan is spinning, meaning it can no longer safely manage the flow of air and exhaust gases. The most common reason is a mechanical failure within the fan motor or a loose electrical connection that prevents the speed signal from reaching the main computer. In some cases, a fault on the control board itself means it can no longer 'hear' the fan, even if the fan is spinning correctly.
Full guide for Modena HE A05Your boiler is failing to detect a flame after it tries to start up, meaning it cannot provide heating or hot water.
Why it happens: This fault happens when the boiler's control system cannot confirm that a flame has successfully lit after trying to start. The most common reasons are a worn-out ignition spark or a dirty sensor that fails to 'see' the flame, though it can also be caused by an incorrect mix of gas and air. Because the boiler cannot guarantee it is burning fuel safely, it shuts down as a protective measure.
Full guide for Modena HE A06Avoid the next call-out bill
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