BoilerFaultCodesThe 6 most common faults
Your boiler has tried to light several times without success, so it has shut itself down for safety.
Check if other gas appliances, like a cooker, are working to confirm gas supply.Ensure your gas meter has credit if you use a prepayment meter.Locate the reset button and press it to attempt a restart.
Your boiler has switched itself off because it has become too hot internally and needs to cool down for safety.
Check that the pressure gauge is between 1 and 1.5 barEnsure all radiator valves and boiler isolation valves are fully openPress the 'Reset' button on the control panel once the system has cooled
Your boiler has stopped working because the water level inside the system has dropped too low and needs topping up.
Locate the filling loop (usually a silver braided hose underneath the boiler).Open the small black valves slowly until you hear water entering the system.Watch the pressure gauge and close the valves once the needle reaches between 1 and 1.5 bar.
Your boiler is starting up but cannot keep the flame lit, which means it will stop providing heating and hot water to your home.
Check that your gas meter has credit and the gas emergency control valve is open.Check that the white plastic condensate pipe leading outside hasn't frozen in cold weather.Reset the boiler by following the instructions on the display panel.
Your boiler’s control panel has no power, meaning the system is completely unresponsive and cannot provide heating or hot water.
Check if other appliances in the house are working to rule out a general power cut.Inspect your main fuse box or consumer unit to see if a circuit breaker has tripped.Check the fused spur switch near the boiler is turned on and the fuse inside is intact.
Your boiler is repeatedly trying and failing to stay alight, causing it to lock itself out for safety after five unsuccessful attempts.
Full guide for Too Many Restartson the Keston Combi2 C30
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 Keston 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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