BoilerFaultCodesThe 6 most common faults
Your boiler has lost the water pressure it needs to circulate heat, so it has safely shut itself down until the system is topped back up.
Locate the filling loop (a silver flexi-hose) beneath the boiler.Open the valves on the filling loop to allow water into the system until the pressure gauge reads between 1 and 1.5 bar.Close the valves tightly and turn the boiler off and on again to reset.
Your boiler has stopped working because it couldn't successfully light the flame after three attempts, often caused by a temporary interruption in the gas supply or air in the lines.
Check that your gas supply is turned on at the meter and that other gas appliances are workingLocate the reset button or turn the control knob to the reset position to clear the errorWait for the boiler to cycle through its ignition process automatically
Your boiler has stopped working for safety reasons because it either cannot light the flame or the system has become too hot.
Check that your gas pre-payment meter (if you have one) has credit.Ensure the gas stopcock is fully turned on.Press the reset button once to try and restart the boiler.If the boiler has overheated, let it cool for 20 minutes before resetting.
Your boiler has shut itself down as a safety precaution because it has detected an internal fault or an interrupted gas supply.
Locate the reset button on the front control panel.Press and hold the reset button for several seconds.Check that your gas meter has credit and the isolation valve is open.
Your boiler has stopped working for safety reasons and needs a manual restart because it either failed to spark or the water pressure is too low.
Check the pressure gauge and ensure it is between 1 and 1.5 barTurn the main Boiler switch to the 'Standby' positionPress and hold the reset button for 10 seconds, then release itTurn the Boiler switch back to the 'On' position
Your boiler has stopped working because it cannot light its burner or has detected an internal safety problem and shut itself down to prevent damage or risks.
Full guide for Lockout lighton the Potterton Puma 100e
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