BoilerFaultCodesThe 6 most common faults
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 is struggling to circulate water, most likely because the pressure inside your system has dropped too low to operate safely.
Locate the external filling loop, usually two valves with a flexible silver hose between them near the boiler or pipes.Open the valves slowly to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close both valves firmly and check the boiler display to see if the fault clears.
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
Your boiler has switched itself off because it got too hot, likely due to a temporary blockage or a pump issue, and it needs to be manually restarted once it has cooled down.
Wait for the boiler to cool down for at least 20 minutesLocate the reset button on the control panelPress and hold the reset button for 2 seconds until the light changesEnsure your radiator valves are open and your central heating pump is running
Your boiler has no power arriving to it, meaning the status lights are completely dark and the system cannot start.
Check if the boiler's electrical isolation switch is turned onCheck your home's main fuse box or consumer unit to see if a circuit breaker has trippedCheck if any other appliances in the same area have power
Your boiler has stopped working because it failed to light properly, resulting in a lockout safety shutdown.
Check if your gas meter has credit and the gas emergency control valve is openPress the Reset button on the control panel for five secondsRepeat the reset process up to three times if the boiler fails to fire on the first attempt
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