BoilerFaultCodesThe 6 most common faults
Your boiler has overheated because the internal temperature reached a safety limit, causing the system to shut down to prevent damage.
Check that your heating system pressure gauge is between 1 and 1.5 barEnsure all radiator valves are open to allow water to flow freelyOnce the boiler has cooled down, attempt to reset the system using the reset button
Your boiler has stopped working because it cannot light the fuel it needs to provide heating and hot water.
Check if your fuel tank has run out of oilEnsure the oil supply valve is fully openPress the reset button once to try and restart the ignition process
Your boiler has stopped running because the water inside has become much too hot, suggesting it isn't moving through the system correctly.
Check that your thermostat is not set unnecessarily highEnsure all radiator valves are fully open to allow water to circulateCheck the system pressure gauge and top it up if it is below 1.0 bar
Your boiler has tried to light but cannot find a steady flame, meaning it has shut down to prevent unburnt oil from building up.
Check if your external oil tank has run out of fuelEnsure the oil supply valve on the tank is fully openPress the reset button on the boiler control panel once
Your boiler has experienced an internal computer glitch where the main control board has lost communication or failed its internal checks.
Turn the boiler off at the fused spur switchWait for 30 secondsTurn the power back on and press the reset button
Your boiler has lost its connection to the main electricity supply, which is preventing it from starting up or continuing to run.
Check your home's main consumer unit (fuse box) to see if any circuit breakers have tripped.Ensure the boiler's power switch or fused spur next to the appliance is turned on.Try resetting the boiler by pressing and holding the reset button for five seconds.
on the Worcester Bosch Danesmoor
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