BoilerFaultCodesThe 6 most common faults
Your boiler has switched itself off because it has reached a temperature that is too high, which usually means the water isn't flowing through the system correctly.
Check that your radiator valves (TRVs) are open and not turned to the 'off' positionEnsure the boiler pressure is between 1 and 1.5 bar on the displayPress the 'Reset' button on the front panel to see if the fault clears
Your boiler has detected that the water is heating up too quickly, which usually means the water isn't moving around the system properly.
Check that your radiator valves are fully openEnsure your boiler pressure is between 1 and 1.5 barGently bleed your radiators to remove any trapped airRestart the boiler using the reset button
Your boiler has detected that water is heating up too quickly or not moving through the system fast enough, causing it to shut down to prevent overheating.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1 and 1.5 bar on the displayBleed all radiators to remove trapped airReset the boiler using the 'Reset' button
Your boiler has sensed that water is not moving through the system quickly enough, causing it to overheat and shut down for safety.
Check that all radiator valves are fully openCheck if the system pressure is between 1 and 1.5 bar on the displayBleed all radiators to remove trapped air
Your boiler has stopped working because the water returning from your radiators is significantly hotter than the water leaving the boiler, suggesting the water isn't flowing correctly.
Ensure all radiator valves (TRVs) are turned to the highest settingCheck that at least one radiator or bypass valve is fully openBleed all radiators to remove trapped air locks
Your boiler's main control board has lost connection with the display panel, meaning the internal parts are no longer speaking to each other correctly.
Turn the boiler power off at the fused spur switch (the wall switch near the boiler).Wait for 60 seconds.Turn the power back on and see if the display reboots and clears the error.
on the Ariston Genus ONE+ WiFi
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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Affiliate links. We may earn a commission at no extra cost to you.