BoilerFaultCodesThe 6 most common faults
Your boiler has detected a blockage in the exhaust pipe or a fault with its internal sensors, causing it to shut down for safety.
Check the white plastic condensate pipe outside for signs of freezing or blockage.Inspect the external flue terminal on your wall to ensure no debris, bird nests, or leaves are obstructing it.Reset the boiler by turning the selector switch to 'R' for five seconds.
Your boiler has switched itself off because it has reached an unsafe temperature, usually due to poor water circulation or a blockage.
Check that your radiator valves are fully openEnsure your boiler pressure is between 1.0 and 1.5 barAllow the boiler to cool down and press the 'Reset' button
Your boiler has stopped working because the water pressure is too low and needs to be topped up.
Locate the filling loop (the flexible silver hose) under the boiler.Slowly open the valve or valves until you hear water flowing.Watch the pressure gauge and close the valves when the needle reaches between 1 and 1.5 bar.
Your boiler is struggling to move water around the system correctly, which could be due to a blockage, air bubbles, or a pump issue.
Check that your radiator valves are fully openBleed your radiators to remove any trapped airEnsure the system pressure is between 1.0 and 1.5 bar on the gauge
Your boiler has stopped working because it cannot light a flame, which is usually caused by a gas supply issue or a frozen condensate pipe.
Check that your gas meter has credit and the isolation valve is openIf it is freezing outside, check if the plastic drain pipe from the boiler has frozen and thaw it with warm waterPress the Reset button for five seconds
Your boiler has detected that water is not circulating correctly through the system before the burner ignites, often due to an air lock or a blockage.
Check that your central heating valves and radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 bar on the pressure gaugeGently bleed your radiators to remove any trapped air from the system
on the Baxi Eco Compact
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