BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light or stay lit, meaning your heating and hot water have stopped working to keep the appliance safe.
Check if other gas appliances in your home (like a hob) are working to ensure gas is reaching the propertyCheck if your gas meter has credit (if using a prepayment meter)Turn the mode selector switch to the 'OFF/RESET' position, wait five seconds, then turn it back to 'ON'
Your boiler has stopped working because it has tried to light several times but the flame keeps going out.
Check that your gas supply is turned on at the meterCheck if other gas appliances, like a hob, are working correctlyPerform a reset by turning the mode selector dial to 'OFF/RESET' and then back to its original position
Your boiler has shut down because it has detected that the internal water temperature has become too hot.
Check that your radiator valves are open and not turned to zeroTurn the boiler mode selector to 'OFF' for 10 seconds, then back to the 'ON' position to resetEnsure your system pressure is between 1.0 and 1.5 bar on the pressure gauge
Your boiler has detected that the water pressure is too low, meaning there isn't enough water inside the system for it to run safely.
Locate the external filling loop, which is a silver flexible pipe with two small valves.Slowly open both valves until you hear water entering the system and watch the pressure gauge.Close both valves tightly once the pressure gauge reaches between 1.0 and 1.5 bar.
The water pressure inside your boiler is too low for it to operate safely, and the system needs to be topped up.
Locate the external filling loop valves (usually underneath the boiler or nearby pipework)Slowly open both valves to allow water into the systemClose both valves once the pressure gauge reaches between 1.0 and 1.5 bar
Your boiler has detected that the water in your central heating system is getting too hot, causing it to shut down for safety.
Check that all radiator valves are fully openEnsure the pressure gauge is between 1 and 1.5 barSwitch the boiler off and back on again to attempt a reset
on the Vokera Synergy System
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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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