BoilerFaultCodesThe 6 most common faults
Your boiler has sensed that water isn't circulating properly and has shut itself down to prevent overheating.
Check the pressure gauge on your system to ensure it is between 1 and 1.5 barTop up the system pressure using the filling loop if it is too lowReset the boiler using the dedicated reset button
Your boiler has stopped working because the amount of water inside your heating system has dropped below the required level.
Locate the filling loop, which is usually a silver braided hose with one or two valves connecting your water mains to the boiler pipes.Open the valves slowly to allow water into the system while watching the pressure gauge on the front of the boiler.Stop when the needle reaches the green zone, typically between 1 and 1.5 bar, then ensure the valves are fully closed.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Locate the external filling loop, which is usually a flexible silver braided hose connecting two cold water pipes near your boiler.Open the valves at both ends of the hose to let water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Close both valves tightly and remove the hose if required by your specific manufacturer's instructions.
Your boiler has paused its operation because it is detecting an electrical supply issue or a problem with how it disposes of waste gases.
Press the reset button briefly (do not hold it down for a long time).Check if any other electrical appliances in the home are behaving strangely, which might indicate a local power grid issue.Ensure the external flue pipe isn't blocked by debris or ice.
Your boiler has switched itself off because it has become too hot and needs a manual reset to restart.
Locate the reset button on the control panel at the bottom of the boiler.Press and hold the reset button for at least 2 seconds.Wait for the flashing red light to turn green or stop flashing.Ensure your radiator valves are open and the system is pressurized.
Your boiler has failed to ignite several times and has shut down as a safety precaution.
Locate the reset button on the control panelPress and hold the reset button for at least 3 secondsWait for the boiler to attempt to reignite; if it fails again, contact a professional
on the Potterton Suprima 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 Potterton 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