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 attempts to start up but cannot confirm that a flame has been established. The most common reasons are a lack of gas reaching the burner, a worn-out ignition spark, or a sensor failing to detect the heat even if the flame did briefly light.
Check if your gas supply is turned on and other gas appliances are workingPress the 'Reset' button on the boiler control panel for 1 secondCheck that your condensate pipe (outside) has not frozen during cold weather
Your boiler is failing to stay lit after it tries to start up, meaning it cannot provide you with heating or hot water.
Why it happens: This fault occurs when the boiler successfully creates a spark and ignites the gas, but then fails to detect that the flame is actually burning. The most common reasons are a dirty or worn-out detection sensor that can't 'see' the fire, or a faulty gas valve that isn't providing a steady enough flow of fuel to keep the flame stable.
Check that your gas supply is turned on at the meterCheck if other gas appliances, like a hob, are working correctlyReset the boiler by pressing the 'Reset' button for 1 second
Your boiler has sensed that parts of the internal system have become too hot, causing it to shut down automatically to prevent damage.
Why it happens: This fault occurs when the internal temperature of the boiler rises above a safe limit, usually because water isn't moving through the system fast enough to carry heat away. The most common reasons are a failing circulation pump, a build-up of sludge or limescale blocking the heat exchanger, or a 'pocket' of air trapped within the unit.
Check that your radiator valves are open to allow water to circulate.Ensure there is enough water pressure in the system (typically 1.0 to 1.5 bar).Press the 'Reset' button on the control panel to see if the fault clears.
Your boiler has sensed that parts of the internal system have become too hot, causing it to shut down automatically to prevent damage.
Why it happens: This fault occurs when the internal temperature of the boiler rises above a safe limit, usually because water isn't moving through the system fast enough to carry heat away. The most common reasons are a failing circulation pump, a build-up of sludge or limescale blocking the heat exchanger, or a 'pocket' of air trapped within the unit.
Check that your radiator valves are open to allow water to circulate.Ensure there is enough water pressure in the system (typically 1.0 to 1.5 bar).Press 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 is too low.
Why it happens: This fault occurs when the water pressure inside your heating system drops below the minimum level required for the boiler to operate safely. The most common reasons for this are a leak somewhere in the pipework or radiators, or because you have recently bled your radiators without topping the water back up.
Locate the filling loop (usually a silver flexible hose) under or near the boiler.Slowly open the valve or valves until you hear water flowing into the system.Watch the pressure gauge and close the valves once the needle reaches 1.5 bar.
Your boiler has shut down to prevent the heat exchanger from overheating, often because the water isn't flowing through the system correctly.
Why it happens: This fault occurs when the boiler's internal sensors detect that the heat exchanger is getting too hot too quickly, which usually indicates that water isn't moving through the unit fast enough to carry the heat away. The most common reason is a failing internal pump or a build-up of sludge and debris that is restricting the flow of water through the system. In some cases, it can also be caused by air trapped in the heat exchanger or a faulty temperature sensor giving an incorrect reading.
Check that your home heating system pressure is between 1.0 and 1.5 barEnsure all radiator valves and isolation valves are fully openTry resetting the boiler using the 'R' button once the unit has cooled down
Your boiler is having trouble setting up its gas and air mixture correctly, which prevents it from firing up safely.
Why it happens: This fault occurs when the boiler's internal computer is unable to verify that the gas and air are mixing in the correct proportions for a safe flame. It is usually triggered because the sensors aren't detecting a consistent signal during the start-up phase or the gas valve isn't responding correctly to the calibration commands. This prevents the boiler from firing up to ensure no unburnt gas or dangerous fumes are produced.
Check that your gas supply is turned on and other gas appliances are workingPress and hold the 'Reset' button for 5 seconds to clear the faultAllow the boiler to attempt its automatic calibration sequence for several minutes
Your boiler's computer or main control board has experienced a hardware error and cannot communicate with the rest of the system.
Why it happens: This fault occurs when the boiler's internal computer experiences a critical communication failure or hardware crash. It is usually caused by an electrical component on the control board wearing out over time or a loose connection in the internal wiring preventing signals from traveling correctly.
Locate the electrical spur or plug for the boilerSwitch the power off for at least 30 secondsSwitch the power back on and press the 'Reset' button on the control panel
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