BoilerFaultCodesThe 6 most common faults
Your boiler has shut down completely for safety reasons because it failed to light a flame.
Why it happens: This fault occurs when the boiler attempts to start but is unable to detect a steady flame, causing it to shut down for safety. The most common reasons include a lack of gas supply to the unit, a build-up of carbon on the ignition probe, or a component failure that prevents the spark from firing.
Check that your gas prepayment meter has credit (if applicable)Ensure the gas stop tap is fully openPress the reset button once to see if the boiler restarts
Your boiler has shut down completely because a safety sensor has detected that the system is overheating.
Why it happens: This fault occurs when the water inside the boiler reaches an unsafe temperature, triggering a safety switch to prevent damage. The most common reasons are a pump failure that stops water from moving or a blockage in the system causing heat to build up too quickly.
Check that your radiator valves are open and not turned to zero.Verify that the boiler pressure gauge is between 1 and 1.5 bar; top up if necessary.Attempt to reset the boiler by turning the selector switch to the 'OFF/RESET' position and then back to 'ON'.
Your boiler has shut itself down for safety because a internal limit or protection switch has been triggered.
Why it happens: This fault occurs when the boiler's internal safety sensors detect that the unit has exceeded its safe operating temperature limit. The most common reasons for this include a lack of water flow, a blockage in the heat exchanger, or a pump that has failed or become stuck. As a precaution, the system shuts down immediately to prevent damage to the internal components.
Locate the reset button or selector switch on the control panelTurn the selector to the 'OFF/RESET' position and wait for 5 secondsTurn the dial back to the 'ON' position to restart the boiler
Your boiler has shut itself down as a safety precaution because one of its internal sensors has detected a potential overheating or pressure issue.
Why it happens: This fault occurs when the boiler's internal temperature or pressure exceeds safe limits, triggering a total system shutdown to prevent damage. It is usually caused by a failure in the circulation pump or a blockage within the heat exchanger that stops water from moving through the unit quickly enough. When the water stays still for too long, it overheats almost instantly, causing the safety sensors to trip.
Check that your boiler pressure is between 1.0 and 1.5 barEnsure all radiator valves are open to allow water to flowPress the 'Reset' button on the control panel to see if the error clears
Your boiler has shut itself down for safety because a critical fault has been detected that requires a manual reset.
Why it happens: This fault occurs when the boiler's safety sensors detect a failure in the ignition process or a consistent loss of flame during operation. The system shuts down to prevent unburnt gas from building up, often triggered by a worn-out ignition spark, a faulty gas supply, or a communication error within the internal electronics.
Locate the reset button or selector switch on the control panelTurn the selector to the 'RESET' position for 5-10 secondsRelease the switch and wait for the boiler to attempt to restart; if the code returns or happens frequently, call an engineer
Your boiler has shut down because it has detected an internal safety issue, likely related to overheating or a lack of water circulation.
Why it happens: This fault occurs when the boiler's internal sensors detect that the water temperature has risen too quickly or peaked beyond safe limits. The most common reason is a failure in the circulation pump or a blockage in the heat exchanger, preventing heat from being moved away from the burner. It can also be triggered if there is air trapped in the system or if the water pressure has dropped too low to function.
Check if the system water pressure is between 1 and 1.5 bar on the pressure gaugeIf the pressure is low, use the filling loop to top it up to the correct levelAttempt to reset the boiler by turning the selector switch to the reset position and back
on the Vokera Condexa Pro
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 Vokera 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