BoilerFaultCodesThe 6 most common faults
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Wait for the boiler to cool down for 30 minutesPress the 'Reset' button on the front panelEnsure all radiator valves are fully open and the system pressure is between 1 and 1.5 bar
Your boiler has detected that water is heating up too quickly because it isn't circulating through the system properly, causing it to shut down for safety.
Check that your boiler pressure is between 1.0 and 1.5 barEnsure all radiator valves (TRVs) are turned to their highest settingCheck that the isolation valves under the boiler are fully open
Your boiler is heating up too quickly because water isn't moving through the system fast enough, causing it to shut down to prevent overheating.
Check that your boiler pressure is between 1 and 1.5 bar on the gaugeEnsure all radiator valves are fully openBleed your radiators to remove trapped air from the systemReset the boiler using the 'Reset' button
Your boiler has detected that water is it not moving through the system quickly enough, causing it to overheat and shut down for safety.
Check that at least two or three radiator valves (TRVs) are turned to the maximum setting.Ensure the boiler pressure gauge is between 1 and 1.5 bar.Bleed all radiators to remove any trapped air pockets.
Your boiler has detected that water is returning to the unit hotter than it was sent out, which usually means the water isn't moving through your radiators properly.
Check that all radiator valves are fully open.Ensure the boiler pressure is between 1 and 1.5 bar on the gauge.Bleed all radiators to remove trapped air which may be blocking flow.
Your boiler has sensed that heat is not moving away from the unit quickly enough, causing the temperature to rise too fast and triggering a safety shutdown.
Check that at least two or three radiators have their valves turned fully open.Ensure the central heating system pressure is between 1.0 and 1.5 bar on the gauge.Bleed all radiators to remove trapped air pockets that might be blocking water flow.
on the Ariston Genus HE
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