BoilerFaultCodesThe 6 most common faults
Your boiler has shut down because it has detected it is getting too hot or that water is not moving through the system properly.
Check that your system pressure is between 1 and 1.5 barEnsure all radiator valves and the boiler isolation valves are fully openPress the reset button once the boiler has had time to cool down
Your boiler has failed to light because it cannot detect a flame, causing the system to lock itself for safety.
Check if your gas supply is active (e.g., check other gas appliances or prepay meter credit)If it is winter, check that your external condensate pipe hasn't frozenPress the Reset button once to see if the boiler restarts
Your boiler has detected that the water pressure in the system is too low to operate safely and effectively.
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 let water into the system.Watch the pressure gauge and turn the tap(s) off once the needle reaches between 1 and 1.5 bar.
Your boiler is failing to stay lit or cannot detect a flame, which means your heating and hot water have stopped working for safety reasons.
Check if other gas appliances in your home, like a hob, are working to confirm gas supply.Ensure your gas pre-payment meter (if applicable) has sufficient credit.Press the 'Reset' button on the front control panel and hold for two seconds.
Your boiler has detected that the electricity supply coming into your home is too low for it to operate safely.
Check if other electrical appliances in your home are behaving strangely or flickeringVerify if there is a known power cut or grid issue in your local areaContact your electricity network provider (DNO) to report a potential supply fault
Your boiler has detected that the water is getting too hot too quickly, likely because it cannot flow through the system properly.
Check that all radiator valves are turned on and open.Ensure the large lever valves underneath or near the boiler are in the 'open' position (parallel to the pipe).Check that your pump is running if it is external to the boiler.Reset the boiler using the reset button once you have checked the valves.
on the Ideal Mexico
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