BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the external filling link or key under the boiler casing.Open the filling valve slowly to allow mains water to enter the system.Monitor the pressure gauge on the front display until it reaches the green zone, typically between 1.0 and 1.5 bar.Close the valve securely.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Locate the external or internal filling link (a silver braided hose or a small plastic key) connected to your boiler.Gradually open the valves on the filling link until you hear water flowing.Watch the pressure gauge on the front of the boiler until it reaches 1.5 bar, then close both valves tightly.
Your boiler has detected that the water pressure in your heating system is falling away much faster than it should, which usually points to a leak somewhere in your radiators or pipes.
Check all radiators, valves, and the boiler itself for visible signs of water leakage or damp patchesLocate the external filling loop connected to your boiler pipesOpen the valves on the filling loop to allow cold mains water into the system until the pressure gauge on the front display reads roughly 1.5 bar, then securely close the valves
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Locate the external filling loop or internal key filling device connected to your boiler pipesSlowly open the valve to allow water to enter the system while watching the pressure gauge on the boiler frontStop filling when the needle reaches the green zone, usually between 1.0 and 1.5 bar, then tightly close the valve
Your boiler has detected that the water inside isn't moving properly, causing it to overheat and shut down for safety.
Check your boiler's pressure gauge and ensure it is between 1 and 1.5 bar; top up using the internal filling link if it is too low.Ensure all radiator valves are fully open to allow water to circulate properly.Turn the boiler off at the fused spur for 60 seconds and switch it back on to reset the system.
Your boiler is overheating because water is not circulating through your heating system fast enough, likely due to low pressure or a blockage.
Check your boiler pressure gauge; if it is below 1 bar, use the internal filling link to top it up to 1.5 bar.Ensure all radiator valves and any isolation valves around the boiler are fully open.Restart the boiler using the reset button to see if the error clears.
on the Worcester Bosch Greenstar 8000 Life
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 Worcester Bosch 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