BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because it cannot light the flame or the internal drainage pipe is backed up with water.
Check if your condensate pipe (typically a white plastic pipe outside) is frozen or blocked.Thaw a frozen pipe with warm (not boiling) water or a hot water bottle.Press the Reset button for five seconds to restart the system.
Your boiler has stopped working because the water pressure is too low or the pump that circulates water is struggling to move it through the system.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is low, use the filling loop valves to top the system up until the needle reaches the green zone.Restart the boiler to see if the fault clears.
Your boiler is not receiving any electrical power from the main supply or has a blown internal fuse, leaving the unit completely unresponsive.
Check if other appliances in the house have powerCheck your main consumer unit (fuse box) to see if a circuit breaker has trippedEnsure the boiler’s external isolation switch (fused spur) is turned on and its fuse hasn't blown
Your boiler has detected low water pressure or a trapped air pocket, which is preventing it from circulating heat properly.
Check the pressure gauge on the front of the boiler; it should be between 1.0 and 1.5 bar.If the pressure is low, use the external filling loop valves to top up the system with water.Ensure all radiator bleed valves and the boiler's automatic air vent are not blocked or tightly closed.
Your boiler has tried to light but cannot find enough gas to start the heating process.
Check if your gas meter has credit or if the emergency control valve is turned on.Check if other gas appliances, like a cooker or hob, are working correctly.Press and hold the reset button for five seconds to see if the boiler restarts.
Your boiler has got too hot and has automatically shut down to prevent damage to the internal components.
Check that your radiator valves are open and not turned to offAllow the boiler to cool down for at least 30 minutesPress the 'Reset' button or turn the selector switch to R for five seconds
on the Baxi System
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