BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light the flame or keep it running, so it has safely shut itself off to prevent gas build-up.
Check if other gas appliances in your home (like a hob) are working to ensure gas is being supplied.Verify that your gas prepayment meter has not run out of credit.If it is freezing outside, check if your white plastic condensate pipe is frozen and gently thaw it with warm water.Press the Reset button on the front of the boiler once.
Your boiler has detected that it is running much hotter than it should be and has switched itself off to prevent internal damage.
Check that all radiator valves are fully open to allow water to flow.Ensure there is enough pressure in the system by checking the built-in gauge.Press the reset button on the front of the boiler to see if the fault clears.
Your boiler has detected an issue with the flame during operation and has safely shut itself down to prevent any risk.
Check if other gas appliances, like a cooker, are working to ensure gas is reaching the propertyCheck the condensate pipe outside for freezing or blockages if it is winterPress the 'Reset' button on the front of the boiler
Your boiler has detected an internal communication error between its main components and requires a professional diagnostic check to identify the faulty link.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 bar on the pressure gaugeGently bleed your radiators to remove any trapped airReset the boiler by turning the mode dial to standby and back again
Your boiler has detected that it is getting dangerously hot and has shut itself down to prevent damage.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 bar on the gaugeReset the boiler by turning the mode knob to the 'reset' position for 2 seconds
Your boiler has detected that it is becoming dangerously hot and has shut itself down to prevent any internal damage.
Check that your radiator valves are fully openEnsure your boiler pressure is between 1.0 and 1.5 bar on the gaugeReset the boiler by turning the mode knob to 'reset' and back to 'on'
on the Ideal Isar HE
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