BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because the amount of water inside your heating system has dropped below the required level.
Locate the internal filling link or external filling loop beneath the boilerSlowly open the valve to allow water into the system until the pressure gauge reads between 1.0 and 1.5 barClose the valve tightly once the correct pressure is reached
Your boiler has stopped working because the amount of water inside your heating system has dropped below the required level.
Locate the internal filling link or external filling loop connected to your boiler pipeworkSlowly open the valve to allow water to enter the system until the pressure gauge reads between 1.0 and 1.5 barClose the valve tightly and check that the error code has cleared
Your boiler's computer system has encountered a logic error and needs to be restarted to resume normal operation.
Locate the power switch or fused spur for the boilerTurn the power off for 60 secondsTurn the power back on and wait for the system to reboot
Your boiler has detected that water is not circulating through the system quickly enough, causing a large temperature gap between the outgoing and incoming pipes.
Check that all radiator valves (TRVs) are fully open and not stuck.Ensure the central heating system pressure is between 1.0 and 1.5 bar.Check if any bypass valves are closed or if there are air locks by bleeding your radiators.
Your boiler has stopped working because the water returning from your radiators is too hot, suggesting it is not circulating through the system correctly.
Ensure at least two or three radiators have their valves turned fully open.Check that your thermostatic radiator valves (TRVs) are not all set to 'zero' or 'off'.Reset the boiler using the display panel to see if the fault clears.
Your boiler has experienced an internal software or communication error that has caused it to lock down for safety.
Locate the up and down arrow keys on the touch-sensitive display.Press and hold both the up and down arrows at the same time for at least 3 seconds.Wait for the display to clear the code and return to the home screen.If the code persists, try turning the boiler off and on at the main isolation switch.
on the Worcester Bosch Greenstar 8000 Style
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