BoilerFaultCodesThe 6 most common faults
Your boiler has switched itself off because it has detected that the internal water temperature has become too high, often caused by a blockage or lack of water pressure.
Check if the pressure gauge is below 1.0 bar and top it up to 1.5 bar using the filling loopEnsure all radiator valves are fully open and any air is bled from the radiatorsSwitch the boiler off and back on to attempt a reset once the system has cooled down
Your boiler has stopped working because it cannot light the burner, likely due to a temporary interruption in the gas supply or a component failure.
Check if your gas meter has credit (if on a prepay meter)Verify that other gas appliances, like a hob, are working correctlyPress and hold the reset button for five seconds
Your boiler is checking if the pump is moving water correctly but has detected a problem with the flow.
Check that your central heating valves (the ones under the boiler) are fully openEnsure all radiator valves (TRVs) are turned to the highest settingCheck the boiler pressure gauge is between 1 and 1.5 barPerform a reset by turning the control knob to 'Reset' for five seconds
Your boiler has shut down because the internal water temperature has become too hot for the system to operate safely.
Check that your radiator valves are fully open to allow water to circulate.Ensure the system pressure gauge is between 1 and 1.5 bar, topping up if necessary.Reset the boiler using the reset button or dial once the system has cooled down.
Your boiler is failing to light the gas burner or has lost its flame while running, which means it cannot provide heat or hot water.
Check if other gas appliances in your home, like a hob, are working to ensure gas supply.Ensure your pre-paid gas meter has enough credit.Press the Reset button for five seconds once gas supply is confirmed.
Your boiler's internal computer has encountered a software or communication glitch and has stopped working to protect itself.
Locate the reset button or dial on the front control panel.Press and hold the reset button for five seconds, then release.Wait up to 10 minutes for the boiler to restart; if the code returns, you will need a professional.
on the Worcester Bosch 24 RSF
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