BoilerFaultCodesThe 6 most common faults
Your boiler has shut down because the water inside the heating system has become too hot and cannot circulate properly.
Why it happens: This fault occurs when the water inside the heat exchanger reaches a dangerously high temperature because it cannot move through the system effectively. The most common reasons are a failed circulation pump that is no longer pushing water around or a blockage caused by a build-up of sludge and debris in the pipework.
Check that all radiator valves and internal doors are open to allow water flow.Ensure your system pressure is between 1.0 and 1.5 bar on the digital display.Restart the boiler once it has cooled down to see if the error clears.
Your boiler is failing to light the gas flame required to provide heating and hot water.
Why it happens: This fault occurs when the boiler's control system attempts to start the combustion process but cannot detect a stable flame. The most common reasons are a lack of gas supply to the unit, a worn-out ignition spark, or a build-up of carbon on the internal probes that monitor the fire. Without a confirmed flame, the boiler stops for safety reasons to prevent unburnt gas from entering the system.
Check if other gas appliances, like a cooker, are working to confirm gas supply is active.If you have a prepayment meter, check that there is enough credit.Ensure the condensate pipe (the plastic pipe outside) hasn't frozen in cold weather.Try resetting the boiler by pressing the reset button for a few seconds.
Your boiler is failing to detect a flame after it tries to ignite, meaning it will not stay lit to provide heating or hot water.
Why it happens: This fault occurs when the boiler's internal sensor fails to detect a steady flame during the start-up sequence, forcing the system to shut down for safety. The most common reasons are a worn-out sensor probe that can no longer 'see' the flame, a faulty ignition cable, or an issue with the gas valve not delivering the correct amount of fuel.
Check if other gas appliances, like a cooker, are working to ensure gas is being supplied to the property.Ensure your gas meter has credit if you use a pre-payment meter.Try resetting the boiler by pressing the 'Reset' button on the display panel.
Your boiler is struggling to breathe because the pipes that take exhaust gases away or bring fresh air in are restricted or blocked.
Why it happens: This fault occurs when the boiler's internal safety sensors detect that air cannot flow freely into the unit or exhaust gases cannot exit through the flue pipe. The most common reasons are a physical blockage in the external pipework, such as debris or a bird's nest, or a mechanical failure of the fan which is responsible for pushing these gases out.
Check the external flue terminal on your outside wall for obstructions like bird nests, leaves, or debris.Ensure there are no items like garden furniture or storage boxes blocking the flue outlet.Clear any heavy snow or ice buildup from the end of the flue pipe.Reset the boiler once to see if the fault clears after removing external obstructions.
Your boiler has stopped working because an internal temperature sensor has failed and can no longer monitor the heating water.
Why it happens: This fault occurs when the boiler's primary temperature sensor becomes unable to send an accurate electrical signal to the main control board. The most common reason is the internal thermistor failing due to age or heat stress, though it can also be caused by loose or damaged wiring connections inside the unit.
Full guide for F000Your boiler has detected that the water temperature is getting too hot while you are trying to use your taps or shower, causing it to shut down for safety.
Why it happens: This fault occurs when the water temperature within the boiler climbs too quickly or exceeds safe limits while you are using your hot water. It is usually caused by a blockage or a component failure that prevents heat from being transferred away from the burner and into your taps effectively. Common culprits include a faulty temperature sensor giving incorrect readings or a stuck diverter valve that isn't directing the hot water where it needs to go.
Full guide for F002on the Intergas Xclusive 24
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Intergas shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue