BoilerFaultCodesThe 6 most common faults
Your boiler has sensed it is getting too hot and has shut itself down as a safety precaution.
Check that all radiator valves (TRVs) are fully open to allow water to flow.Ensure there is enough water pressure in the system by checking the gauge is between 1 and 1.5 bar.Reset the boiler by turning the control knob to the 'Reset' position and holding for 2 seconds.
Your boiler is failing to light the gas to start the heating or hot water process, and has locked itself for safety after 5 attempts.
Check that your gas prepayment meter has credit (if applicable)Check that other gas appliances, like a cooker hob, are working to confirm gas supplyPress and hold the 'Restart' button for two seconds to see if the boiler resetsIn freezing weather, check that the white plastic condensate pipe outside is not frozen
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the filling loop (usually a silver flexible hose with small taps) underneath the boiler.Slowly open both taps one at a time until you hear water entering the system.Watch the pressure gauge and close both taps tightly once the needle reaches 1.5 bar.Press the 'Restart' button on the boiler control panel to clear the fault code.
Your boiler has lost its gas supply or cannot detect a flame, meaning it cannot stay alight to provide heating or hot water.
Check if other gas appliances in your home, like a hob, are working correctly.Verify that your gas emergency control valve is in the 'on' position.Check your gas meter to ensure you have credit if you use a top-up or pre-payment system.Reset the boiler by pressing the reset button to see if it clears a temporary glitch.
Your boiler is failing to stay lit, which means the system cannot get the heat it needs to provide you with hot water or warming for your radiators.
Check if other gas appliances, like a cooker, are working to ensure gas is reaching the propertyIf it is freezing outside, check that the white plastic condensate pipe leading outdoors is not frozenPress and hold the 'Restart' button for two seconds to attempt a reset
Your boiler is struggling to keep its flame lit, which means the system has safely shut down to prevent unburnt gas from building up.
Check if other gas appliances, like a cooker, are working to confirm your gas supply is active.If you have a prepaid gas meter, check that you have sufficient credit.Press the Reset button once to see if the boiler restarts normally.
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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 Ideal 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