BoilerFaultCodesThe 6 most common faults
Your boiler has switched itself off because the internal water temperature has become too hot, usually caused by a lack of water flow through the system.
Check that your radiator valves are fully openEnsure your boiler pressure is between 1 and 1.5 bar on the gaugeReset the boiler by turning the control knob to 'RE' or pressing the reset button
Your boiler has failed to light several times and has shut down for safety, meaning you currently have no heating or hot water.
Check if your gas supply is active by testing another gas appliance like a hob.Check if your condensate pipe (the white plastic pipe outside) is frozen or blocked.Reset the boiler by turning the control knob to 'Reset' and holding for two seconds.
Your boiler has temporarily stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the filling loop underneath your boiler or check the built-in keyless filling link.Open the valves slowly to allow mains water into the system until the pressure gauge reads between 1 and 1.5 bar.Close the valves firmly and press the reset button on your boiler.
Your boiler has completely lost power and the screen is blank, meaning it is not currently working.
Check that the fused spur switch supplying power to the boiler is turned on.Inspect your home's fuse box or consumer unit to see if the circuit breaker for the boiler has tripped.If the breaker has tripped, try resetting it once; if it trips again immediately, stop and call an engineer.
Your boiler has stopped working because a small electronic identification chip is either missing or has not been properly set up on the control board.
Full guide for C2Your boiler has temporarily locked itself out for safety after registering too many automatic resets in a short space of time.
Full guide for L and 5on the Ideal Exclusive
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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