32 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Ferroli Modena HE
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Tap any card for details
Your boiler is failing to light the fuel inside, meaning it cannot produce any heat or hot water for your home.
Your boiler has detected a flame signal when it shouldn't be running, which indicates a potential safety issue with the internal electronics or sensing equipment.
Your boiler has detected that it is overheating and has automatically switched itself off to prevent damage.
Your boiler has detected that the exhaust gases leaving the unit are dangerously hot and has shut itself down to prevent damage or safety hazards.
Your boiler is not detecting that the exhaust fan is running correctly, which prevents it from safely clearing waste gases.
Your boiler is failing to light the burner despite several attempts, meaning it currently cannot provide heating or hot water.
Your boiler has lost the signal from the sensor that monitors the water temperature, meaning it cannot tell how hot the water is or if it needs to heat up.
Your boiler has detected that hot combustion gases are not venting away correctly and has safely shut down to prevent the risk of carbon monoxide poisoning.
Your boiler is failing to light the flame needed to produce heat and hot water, likely due to an issue with the gas supply or the air intake system.
Your boiler has detected an issue with the airflow system, which prevents it from firing up safely to provide heating or hot water.
Your boiler has stopped working because it is unable to accurately read the temperature of the water inside the system.
Your boiler is struggling to detect the temperature of the water for your taps and shower, which means the hot water may be inconsistent or not working at all.
Your boiler is struggling to accurately detect the temperature of the water used for your taps and shower, so it has stopped heating it to prevent overheating.
Your boiler has detected a problem with the sensor that monitors the temperature of the gases leaving your flue, causing it to shut down for safety reasons.
Your boiler has stopped working because it can no longer accurately measure the temperature of the water used for your heating system.
Your boiler has stopped working because the fan that clears hazardous gases is not spinning or responding as expected.
Your boiler has detected an issue with the air or exhaust system, meaning it cannot safely burn gas, and has shut itself down to prevent a safety risk.
Your boiler has detected an issue with the air intake or exhaust system, meaning it cannot safely burn the gas required to heat your home.
Your boiler is struggling to clear exhaust gases because the fan component, which helps vent the system, is not receiving power or is failing to start.
Your boiler is struggling because the electricity supply it is receiving is weaker than it needs to function correctly.
Your boiler is struggling because it is picking up unstable or inconsistent electrical power from your home's mains supply.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Your boiler is struggling to detect the temperature outside, so it is defaulting to its standard internal settings to keep your home warm.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
System pressure too high
Your boiler is struggling to detect the flow of water, which is preventing it from heating your home or providing hot water.
Your boiler has detected that the water inside isn't moving properly and has shut down to prevent the internal parts from overheating.
Your boiler is failing to detect the water pressure in the system, which prevents it from safely igniting to provide heating or hot water.
Your boiler is unable to safely control the flow of gas required to ignite and heat your home.
Combustion control malfunction
Your boiler has stopped working because the water pressure inside your heating system has dropped too low to operate safely.
Your boiler is failing to light the flame needed to heat your water and home.
BoilerFaultCodes