BoilerFaultCodesThe 6 most common faults
Your boiler is failing to light itself after several tries and has locked out for safety.
Check if your gas supply is turned on at the meterCheck if other gas appliances like a hob are workingPress the Reset button once to see if the boiler restarts
Your boiler has detected that the water inside is getting dangerously hot and has shut down to prevent damage.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barCheck if any bypass valves or external pumps are switched off
Your boiler is repeatedly struggling to stay lit and has locked itself out for safety after multiple failed attempts to ignite.
Check if other gas appliances (like a hob) are working to ensure gas supplyEnsure your pre-paid gas meter has creditPress the Reset button once to see if the fault clears
Your boiler is struggling to operate because the electrical power coming into your home is unstable or not at the correct frequency.
Turn the boiler off using the power switch or at the fused spur.Wait for 60 seconds to allow the electronics to reset.Turn the power back on and press the 'Reset' button on the control panel.
Your boiler is struggling because the electrical supply to the unit is unstable or incorrect, preventing it from running safely.
Turn the boiler off at the fused spur switchWait for 60 secondsTurn the power back on and press the Reset button
Your boiler has detected that water is not moving through the system correctly, which has caused it to stop working to prevent overheating.
Check that the boiler pressure is between 1 and 1.5 bar on the pressure gauge.Ensure all radiator valves and isolation valves under the boiler are fully open.Try restarting the boiler using the Reset button to see if the fault clears.
on the Ariston Genus Premium
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 Ariston 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