BoilerFaultCodes
The most common Intergas 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 sensed that the water returning from your radiators is hotter than the water leaving the boiler, which usually means there is a circulation problem or a sensor fault.
Why it happens: This fault occurs when the boiler's internal sensors detect that the system is operating in reverse, with the return pipe being hotter than the flow pipe. The most common reason is a circulation failure, often caused by a faulty pump or a blockage in the heat exchanger that prevents water from moving through the boiler correctly. It can also be triggered if one of the temperature sensors has failed and is providing an incorrect reading to the control board.
Full guide for Combi Compact ECO RF 24Your boiler has detected an internal electrical issue with the mechanism that controls the gas supply, meaning it cannot safely start up.
Why it happens: This fault occurs when the boiler's control system loses communication with the fan or detects that it isn't spinning at the required speed. The most common reasons are a mechanical failure of the fan motor itself, loose internal wiring, or a fault on the main circuit board failing to send power to the unit.
Full guide for Combi Compact ECO RF 29Your boiler has detected an internal electrical fault with the component that controls the gas supply, meaning it cannot safely start up to provide heating or hot water.
Why it happens: This fault occurs when the boiler detects that the water coming back from your radiators is much hotter than the water it just sent out, which shouldn't happen during normal operation. The most common reason is a lack of water flow caused by a blockage, trapped air, or a failing pump, but it can also be triggered if the electronic sensors that measure temperature become faulty and provide 'garbage' readings to the control board.
Full guide for Combi Compact ECO RF 30Your boiler has detected a problem with its primary temperature sensor and has stopped working as a safety precaution.
Why it happens: This fault occurs when the boiler's main flow sensor, which monitors the temperature of the water leaving the heat exchanger, fails to provide a consistent or logical reading. The most common reason is that the internal electrical component of the sensor has worn out or developed a short circuit, preventing the control board from knowing if the water is at a safe temperature.
Full guide for Combi Compact ECO RF 10Avoid the next call-out bill
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