BoilerFaultCodesThe 6 most common faults
Your boiler's burner has shut itself down for safety because it failed to light or stay lit correctly.
Check that your gas or oil supply is turned on and you have credit on your meter.Locate the reset button on the burner control box and press it once.Check for any obvious blockages in the flue pipe outside.
Your boiler has failed to ignite or stay lit, meaning your heating and hot water have stopped working to protect the system.
Check if your gas supply is active (e.g., check other gas appliances or your meter credit)Press and hold the 'Reset' button for 3 secondsEnsure the condensate pipe (the white plastic pipe outside) hasn't frozen in cold weather
Your boiler has switched itself off because it has detected that the water inside has become dangerously hot.
Check that all radiator valves are fully open to allow water flowInspect the system pressure gauge and top up to 1.5 bar if it is too lowPress the reset button on the front control panel to restart the boiler
Your boiler has likely overheated or a safety sensor has detected an electrical fault, causing the system to shut down for safety.
Check that all radiator valves are fully openEnsure your boiler pressure is between 1.0 and 1.5 barPress and hold the reset button for 2 seconds
Your boiler has detected an issue with its electrical grounding or wiring, which is a safety mechanism that prevents electrical faults.
Full guide for V/JYour boiler's internal thermostat or control wiring has lost connection, preventing the heating from firing up.
Full guide for T1/T2on the Ideal Falcon Gte
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