BoilerFaultCodesThe 6 most common faults
Your boiler has detected that it is not working correctly and has shut down as a safety precaution.
Locate the reset button on the control panelPress and hold the reset button for 5 secondsCheck if the system pressure gauge is between 1.0 and 1.5 barEnsure all isolation valves under the boiler are fully open
Your boiler has entered a general safety shutdown and needs to be manually restarted to check if the error is temporary.
Locate the reset button on the boiler control panelPress and hold the reset button for several secondsWait for the boiler to complete its startup sequenceEnsure your thermostat is calling for heat
Your boiler has tried to light several times without success and has now locked itself out for safety.
Check that your gas meter has credit (if using a prepay meter).Ensure the gas isolation valve to the boiler is fully open.Press the 'Reset' button on the control panel to see if the boiler restarts.
Your boiler has stopped working because the water pressure in the central heating system has dropped too low.
Locate the external filling loop, which is usually a flexible silver hose with two small valves.Slowly open both valves to allow water into the system while watching the pressure gauge.Close both valves tightly once the gauge reaches between 1.0 and 1.5 bar.
Your boiler has detected that there is too much water pressure inside the system, causing it to shut down for safety.
Check that the silver filling loop valves are tightly closedBleed water from a radiator using a bleed key to reduce pressureMonitor the pressure gauge to ensure it stays between 1.0 and 1.5 barReset the boiler once the pressure is back in the green zone
Your boiler has stopped working because it cannot detect any water pressure in the system.
Check the pressure gauge on the front of the boiler or under the casing.If the pressure is below 1.0 bar, locate the filling loop (braided flexible hose) underneath the boiler.Slowly open the valves on the filling loop to top up the water until the gauge reads between 1.0 and 1.5 bar.
on the Johnson Starley Comet 60
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