BoilerFaultCodesThe 6 most common faults
Your boiler has switched itself off because it has become too hot internally and needs to cool down for safety.
Check that your radiator valves are open and not turned off.Ensure there is enough water pressure in the system by checking the pressure gauge (usually between 1 and 1.5 bar).Press the reset button on the front of the boiler once it has cooled down.
Your boiler has tried to light several times but cannot establish a flame, usually because the gas supply is interrupted or a component is faulty.
Check if your gas meter has credit (if on a prepayment meter)Check if other gas appliances, like a hob, are working to confirm gas is flowingPress the 'Reset' button on the front of the boiler for five secondsIf it is freezing cold outside, check if your white condensate pipe is frozen and thaw it with warm water
Your boiler has detected that there is not enough water in the system to operate safely, causing it to shut down temporarily.
Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.Slowly open the small tap(s) on the filling loop to allow water into the system.Watch the pressure gauge and close the taps once it reaches 1.5 bar, then restart the boiler.
Your boiler has started an ignition sequence but the flame went out or could not be detected during operation.
Check if other gas appliances, like a hob, are working to ensure gas supply is activeEnsure your gas meter has credit if you use a top-up meterPress and hold the reset button for two seconds
Your boiler was running but the flame went out unexpectedly, causing the system to stop working for safety.
Check if other gas appliances in your home (like a hob) are working to confirm gas supply.Check if your gas meter has credit or if the emergency control valve is open.Press the reset button once to see if the boiler restarts.
Your boiler has lost its flame while running and has shut down as a safety precaution.
Check that your gas supply is active and that other gas appliances are workingCheck that the condensate pipe (the plastic pipe running outside) isn't frozen if it is very cold weatherPress the Reset button on the front of the boiler
on the Ideal Independent System2 S15
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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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