BoilerFaultCodesThe 6 most common faults
Your boiler is struggling to circulate water properly, likely because the pressure inside your heating system has dropped too low or the internal pump is stuck.
Check the pressure gauge on the front of the boiler; if it is below 1 bar, locate the filling loop (usually a silver lever or flexible hose underneath).Slowly open the filling loop to let water into the system until the gauge reads between 1 and 1.5 bar.Close the filling loop firmly once the needle is in the green zone and restart the boiler.
Your boiler has detected that it is firing without enough water inside, which has triggered a safety shutdown to prevent internal damage.
Check the pressure gauge on the front of the boilerIf the pressure is below 1 bar, use the filling loop to top it up to 1.5 barReset the boiler by turning the selector switch to 'R' for five seconds
Your boiler has failed to light several times and has locked itself for safety, meaning you currently have no heating or hot water.
Check if other gas appliances in your home, like a gas hob, are working to confirm your gas supply is active.Check if your gas meter has credit (if on a prepayment meter) and that the emergency handle is in the 'ON' position.Press the reset button on the front of the boiler control panel for five seconds to see if it restarts.
Your boiler has reached an unsafe temperature and has automatically shut down to prevent damage.
Wait for the boiler to cool down for at least 30 minutes.Check that your radiator valves are open and not blocked by furniture.Turn the selector switch to the 'Reset' position for five seconds and then back to its original setting.
Your boiler has failed to ignite the gas burner, which means it cannot heat your water or radiators.
Locate the reset button (usually marked with an 'R' or a flame symbol) and hold for 5 seconds.Check that your gas emergency control valve is in the 'on' position and other gas appliances are working.Ensure your prepaid gas meter has sufficient credit.
Your boiler has lost water pressure, meaning there isn't enough water in the system to keep the heating and hot water running.
Locate the filling loop (usually a silver flexible hose) underneath your boiler.Slowly open the two black taps on the filling loop until you hear water flowing.Watch the pressure gauge and close both taps tightly once the needle reaches 1.5 bar.
on the Baxi Combi Elite
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 Baxi 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