BoilerFaultCodesThe 6 most common faults
Your boiler has detected that water is either not moving around the system correctly or that the pressure of the water inside the unit is too low to run safely.
Locate the pressure gauge on the front of your boiler.Check if the needle is below the 1 bar mark.Use the filling loop (a metal braided hose or key under the boiler) to slightly open the valves and top up the system until the needle reaches 1.5 bar.
Your boiler has stopped because it cannot safely ignite, or the internal pipe carrying waste water is blocked.
Check if your gas supply is working by testing another gas appliance like a hob.Locate the external plastic condensate pipe outside your home and check if it is frozen or blocked.Press the reset button on your boiler for up to 5 seconds to see if it restarts.
Your boiler has stopped working because the water pressure inside the system is too low or the internal water pump is not running correctly.
Locate the filling loop underneath your boiler.Open the valves gently to let water in until the pressure gauge on the front reads between 1 and 1.5 bar.Close the valves tightly and check the boiler display or reset the unit.
Your boiler has stopped working because the water pressure inside the system is too low or the internal water pump has failed to move heat around your home.
Check your boiler's pressure gauge; if it is below 1 bar, top it up using the filling loopOnce the pressure is between 1 and 1.5 bar, switch the boiler off and back on at the mains to reset itIf the pressure was normal, turn the heating thermostat up to check if the pump hums
Your boiler has stopped working because it cannot light its burner properly, which is often caused by a blockage in the pipe that drains away waste water.
Full guide for 24Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Full guide for 25on the Potterton Performa 24i 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