BoilerFaultCodesThe 6 most common faults
Your boiler has tried to light several times but has failed to stay on, so it has locked itself out for safety.
Check that your gas pre-pay meter has credit (if applicable)Check that other gas appliances like your hob are working to ensure gas supplyPress the reset button on the boiler control panel once
Your boiler has detected that the water pressure in the central heating system is too low and it has stopped working as a safety precaution.
Locate the external filling loop, which is usually a silver braided flexible hose under or near the boiler.Slowly open the one or two valves on the hose to let water into the system.Watch the pressure gauge and close the valves tightly once the needle reaches between 1.0 and 1.5 bar.
Your boiler has stopped working because it cannot detect any water pressure, which means it cannot safely heat your home.
Locate the pressure gauge on the front of the boiler or underneath it.If the needle is below 1 bar, find the filling loop (a flexible silver hose).Slowly open the valve(s) until the pressure reaches 1.5 bar, then close them tightly.Press the 'Reset' button on the control panel.
Your boiler has tried to light several times but failed, so it has locked itself for safety.
Check that your gas prepayment meter has creditEnsure your external gas stopcock is fully openPress and hold the reset button for five seconds
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Check that all radiator valves are open to allow water to flow.Ensure there is enough water pressure in the system by checking the pressure gauge.Wait for the boiler to cool down and try pressing the reset button.
Your boiler has shut itself down for safety after too many failed attempts to reset it remotely or due to a persistent internal fault.
Locate the reset button on the boiler control panel.Press and hold the reset button for five seconds.Wait for the boiler to complete its startup sequence; if the code returns, contact a professional.
on the Johnson Starley Warmaheat
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 Johnson Starley 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