BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working to protect itself and is waiting for you to check a secondary code to find the specific problem.
Check the display for a flashing number alternating with the 'L' codePress and hold the 'Reset' button for 3 secondsCheck your gas supply and boiler pressure if the reset does not work
Your boiler has identified a specific internal fault and is flashing to let you know it needs attention to identify the exact problem.
Check the display for a number or letter alternating with the 'F' codeNote down any specific numbers to inform your engineerTry resetting the boiler by turning the selector switch to the reset position for five seconds
Your boiler has failed to ignite after several attempts, meaning it has shut itself down for safety and currently cannot provide heating or hot water.
Check that your gas emergency control valve is open and that other gas appliances in your home are working.If you have a prepaid gas meter, ensure it has sufficient credit.Press and hold the 'Restart' button for two seconds to clear the fault.
Your boiler has switched itself off because the water inside it has become too hot, likely due to a circulation problem.
Check that all radiator valves are fully openEnsure the boiler pressure gauge is between 1 and 1.5 barPress and hold the Reset button for 2 seconds
Your boiler has tried to light several times but has failed to stay on, meaning your heating and hot water will not work until it is reset or repaired.
Check if you have credit on your gas meterEnsure the gas emergency control valve is in the 'open' positionPress and hold the 'Reset' button for five seconds
Your boiler has detected that there is not enough water in the system to operate safely, which is usually caused by a small leak or air being bled from a radiator.
Locate the filling loop (a flexible silver hose) underneath the boiler.Slowly open the one or two taps on the loop until you hear water flowing.Watch the pressure gauge until it reaches 1.5 bar, then turn the taps off tightly.
on the Pro ProCombi Exclusive 24
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 Pro 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